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U N I T E D ~ s r A T E s v P A T i ~ I s V r o F F l c EP r e s t o n B . . B a s s e t t , R o c k v i l l e C e n t r e , a n d FrankR . H o u s e , B a l d w i n H a r b o r , N . Y . , a s s i g n o r s t oS p e r r y G y r o s c o p e Company, I n c . , B r o o k l y n ,4`N. Y . , a corporation of New York

A p p l i c a t i o n Ma y 1 s , 1 9 3 2 , s e r a i Nogeusss2 o _ claims: ( c i . 2 4 o - 1 . 2 ) v i

This i n v e n t i o n relatestoapparatus f o r l o c a t i n ga nd i l l u m i n a t i n g a i r c r a f t a t ` n i g h t s o t h a t a n t i. aircraftgun i l r e may be d i r e c t e d t h e r e o n . T hep r e s e n t p r a c t i c e i s t o ' e m p l o y a sound l o c a t i n g d e

v i c e , such as a binaural sound l o c a t o r , o r o t h e r 'n o n - o p t i c a l s y s t e m o f l o c a t i n g t h e t a r g e t b l i n d a n d t o t r a n s m i t therefrom t o a s e a r c h l i g h t thel o c a t i o n o f t h e t a r g e t , a f t e r a p p l y i n g c e r t a i n c o rr e c t i o n s . S u c h a system i s o u t l i n e d i n t h e p r i o ra p p l i c a t i o n o f > F r a n k R . H o u s e , on e o f t h e j o i n ti n v e n t o r s h e r e t o , n ow P a t e n t N o . 1 , 9 7 6 , 7 2 7 , d a t e dO c t o b e r y 1 6 , 1 9 3 4 , f o r Sound l o c a t o r s a n d computers f o r a i r c r a f t . With such a system, a cont i n u o u s s e r i e s o f datum ointsor p r e d i c t e d p os i t i o n s i s determined from t h e d i r e c t i o n o f t h eincoming sound with p r o p e r c o r r e c t i o n s a p p l i e dt h e r e t o . I t i s a t t h i s p o i n t i n t h e sk y t h a t t h es e a r c h l i g h t b e a m i s d i r e c t e d . However, a s t h e r ea r e always c e r t a i n ` e r r o r s i n l i s t e n i n g a n d i n thep r e d i c t i o n o f t h e t a r g e t p o s i t i o n , i t h a s b e e n f o u n dn e c e s s a r y ' t o mo v e the s e a r c h l i g h t about thedatum o s i t i o n s , so as to se arch a r o u n d these p o-s i t i o n s u n t i l t h e t a r g e t i s f o u n d . .O u r i n v e n t i o n r e l a t e s p a r t i c u l a r l y t o a n im-vp rove m e nt i n t h e method o f s e a r c h i n g through adenite l i m i t e d area around t h i s datu m p o s i t i o nin a syste m atic manner so as to s c a n e v e r y pointWithin t h i s area a n d t o m a k e c e r t a i n that t h i sv c o m p l e t e a r e a w i l l b e p r o g r e s s i v e l y i l l u m i n a t e dwithin a ve r y short interval so as to leave n ob l i n d s p o t s i n which the plane c o u l d be withoutbeing i l i c k e d by the br a m. According t o ou r i nv e n t i o n we i n t e r p o s e i n the automatic d i s t a n t ` >c o n t r o l o f t h e s e a r c h l i g h t from t h e comparatora m e ch a n is m s e n i l - a u t o m a t i c i n character a n dp r e f e r a b l y manually c o n t r o l l e d , which c a u s e s t h e> s e a r c h l i g h t t o scan a complete area about thed at u m p o s i t i o n . The area sca n n ed i s chosen asthe o u t s i d e l i m i t s o f e r r o r i n t r a n s m i t t i n g thep r - d i c t e d p o s i t i o n s o that i t a m o u n t s t o a coneof only a f e w degrees in a zi m uth and e l e v a t i o n .Another o b j e c t o f ou r i n v e n t i o n i s t o p r o v i d e am e a n s whereby t h e ` automatic c o n t r o l o f t h es e a r c h l i g h t from t h e sound o r o t h e r n o n - o p t i c a ll o c a t o r m a y b e i n s t a n t l y i n t e r r u p t e d a t t h e t i m et h e t a r g e t i s s i g h t e d d u r i n g t h e s e a r c h i n g o p e r at i o n a n d t h e c o n t r o l t r a n s f e r r e d t o the b e a m o r- s e a r c h l i g h t o p e r a t o r a t t h e b i n o c u l a r o b s e r v a t i o nor control s t a t i o n .Another o b j e c t o f t h e i n v e n t i o n i s t o p r o v i d e

a t . the comparator o r c o n t r o l d e v i c e , b i n o c u l a r so r a s i g h t i n g t e l e s c o p e which s kept t r a i n e d a u t o - vmatically a t the same point inthe he a v e n s thatthe s e a r c h l i g h t b e a m i s d i r e c t e d s o that the obs e r v e r - o p e r a t o r a t t h e c o m p a r a t o r m a y a l w a y s

have h i s s i g h t d i r e c t e d i n the s a m e d i r e c t i o n a st h e s e a r c h l i g h t ~ > b e a m w h i c h . h e ~ i s o b s e r v i n g a n d ,t h e r e I o r e . _ b e - a b 1 e t o p i c k up i n s t a n t l y t h e t a r g e twhen i l i c k e d ' b y the b e a m .Referring t o the :drawings showing s e v e r a lform s ou r invention may ssu m e:F i g . 1 i s a s c h e m a t i c v i e w v showing t h r e e p r i nc i p a l e l e m e n t s o t a sound l o c a t o r s e a r c h l l g h t b a tt a r y , n a m e l y , t h e v s o u n d l o c a t o r , t h e c o m p a r a t o ra nd t h e s e ' a r c h l i g h t . 4F i g . ` 2 i s a . s c h e m a t i c v i e w showing t h e p r ef e r r e d form o f m e ch a ni s m f o r a scanning opera

tion. ' ' s \ ' .Fig. 3 . i s a s e c t i o n a l d e t a i l o f the me chanismwhereby t h e b e a m i s caused t o s e a r c h i n a n o u twardly s p i r a l path from t h e datum p o s i t i o n . ,F i g . 4 V shows t h e r e s u l t i n g s p i r a l m o v e m e n t o f as e a r chl i g ht beam. .F i g . 5 i s a diagrammatic view o f t h e m e cha

n i s m _ w i t h i n t h e c o m p a r a t o r which s u p p l e m e n t s vthe showing in Fig. 2 . -F i g . 6 i s a diagrammatic view o f a modi edform of the invention. Y > `F i g . I i s a diagram showing t h e path o f mo v em e n t o f t h e s e a r c h l i g h t b e a m r e s u l t i n g from t h eform o f t h e i n v e n t i o n shown i n ' F i g . 6 .The sound l o c a t o r i s shown g e n e r a l l y a t L nF i g s . 1 a nd 2 a n d p r e f e r a b l y c o n s i s t s o f a p a i r o fhorns A n d Bspaced apart i n azimuth a n d a no t h e r p a i r o f h o r n s C a n d D p a c e d a p a r t i n e l e v at i o n . -There s on e p e r a t o r f o r each a i r o f h o r n s ,t h e azimuth o p e r a t o r l i s t e n i n g through t h e e a rp i e c e s i n the helmet E n d the e l e v a t i o n o p e r a t o rl i s t e n i n g t h r o u g h - t h e e a r p i e c e s i n t h e h e l m e t F .A l l the hornsturn t o g e t h e r but the azimuth ope r a t o r t u r n s them i n a z i m u t h t h r o u g h ha n d l e G ,a nd t h e e l e v a t i o n o p e r a t o r s i m i l a r l y c o n t r o l s t h ehorns i n e l e v a t i o n through t h e handle H. ' I ' h ee x a c t p o s i t i o n s o i ' t h e h o r n s i n azimuthand e l evation a re not t r a n s m i t t e d , however, but the c o ry r e c t i o n s (more a r t i c u l a r l y d e s c r i b e d i n t h e a f o r es a i d p r i o r a p p l i c a t i o n ) a r e r s t i n t r o d u c e dthrough t h e d i f f e r e n t i a l s 6 i n l a z i m u t h a nd 1 i ne l e v a t i o n , t h e A c o m p u t i n g , mechanism b e i n g 1 oc a t e d i n the base 8 o f the sound l o c a t o r .From t h e c o r r e c t i o n mechanism 8 , t h e azimutha n d e l e v a t i o n V a n g l e s a r e t r a n s m i t t e d ` t h r o u g htransmitter 8 0 a n d 8 | a n d c a b l e 9 t o the c omparator I I l t h e u p p e r p o r t i o n of'which i s r o t a ta b l y mounted on i t s t r i p o d b a s e . ' l ' h i s d e v i c eforms a m e a n s by which p o s i t i o n o f the searchi l g h t s i s c o n t r o l l e d a n d s u s u a l l y l o c a t e d a t somed i s t a n c e from t h e s e a r c h l i g h t i n o r d e r t o o b t a i nb e t t e r v i s i o n . I f d e s i r e d , t h e s e a r c h l i g h t a n g l e sc o u i d w b e a u t o m a t i c a l l y t r a n s m i t t e d from t h e

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2sound l o c a t o r a s i n d i c a t e d i n F i g . 6 , but we haveshown i n F i g s . 1 t o 5 the s e a r c h l i g h t a s c o n t r o l l e dt h r o u g a m a n u a l f o l l o w - t h e - p o i n t e r s y s t e m , t h eazimut p o s i t i o n o f t h e sound o c a t o r b e i n g t r a n smitted t o a d i a l I I i n the comparator a n d the e l ev a t i o n t o a d i a l I 2 . I t i s , t h e r e f o r e , the duty o fthe operator o f the handwheel I 3 t o m a t c h theo u t e r p o i n t e r I 4 with t h e p o i n t e r on the d i a l I Ia nd i t i s t h e duty o f t h e o p e r a t o r o f t h e e l e v a t i o nhandwheel I 5 t o match t h e o u t e r p o i n t e r I 6 withthe pointer on d i a l I 2 . Dials I I a n d I 2 are cont r o l l e d r e s p e c t i v e l y from s u i t a b l e r e p e a t e r m o t o r sI 1 a n d I 8 actuated f ro m t r a n s m i t t e r s 8 0 a n d 8 |i n t h e base o f the sound l o c a t o r I . R e f e r r i n g f i r s t t o F i g . 2 , V t h e r e i s shown i n t e rposed between t h e handle I 3 a n d t h e d i a l I 4 oneo r more d i f f e r e n t i a l s 2 0 a n d 2 | . Through thecenter arm o f d i f f e r e n t i a l 2 6 i s introduced onecomponent o f t h e scanning r s e a r c h i n g m o t i o n .As shown, the center arm 2 i s provided with aspur gear meshing with a n e l o n g a t e d p i n i o n 2 3on s h a f t 2 4 . On a i d s h a f t i s a pinion 2 5 m e s hin g with rack teeth 2 6 on a rack ba r 2 1 . Asshown i n F i g . 2 , t h e p i n i o n 2 5 a n d t h e rack t e e t ha r e i n a plane a t r i g h t a n g l e s t o the plane o fs h a f t 2 4 i n order t o show t h e s e p a r t s i n on en g u r e , b u t i t w i l l b e understood t h a t the p l a n eo f t h e p i n i o n 2 5 i s r e a d i l y p e r p e n d i c u l a r t o t h ep a p e r as i s the pinion 28 on the s a m e s h a f t . As i m i l a r p a i r o f d i f f e r e n t i a l s 2 0 a nd 2 | ' i s p r o v i d e dbetween the e l e v a t i o n handwheel I 5 a n d the e l evation d i a l I 6 . Likewise a s i m i l a r shaft 2 4 i sp r o v i d e d , having a p i n i o n 2 3 ' meshing with s p u rgear 2 2 on the p lanetary a r m o f the d i f f e r e n t i a l .Shaft 2 4 ' i s l i k e w i s e provided with a p i n i o n 2 5 meshing with rack teeth 2 6 ' on a second bar 2 9p i v o t e d a t i t s u p p e r e n d on a common i v o t pin3 6 with the ba r 2 1 . From the center of the twop i n i o n s 2 5 a n d 2 5 ' t o t h e c e n t e r o f the p i v o t pin3 0 c o n s t i t u t es a r i g h t a n g l e when t h e p i n i s . i ni t s c e n t r a l o r i n o p e r a t i v e p o s i t i o n .P i v o t pin 3 0 i s shown mounted on a block 3 Iwhich i s s l i d a b l y but non-rotatably mou nted ona shaft 3 2 . Said shaft ha s a n endless doubles p i r a l groove 3 3 t h e r e i n i n t o which ` p r o j e c t s ap i n 3 4 from t h e i n t e r i o r o f the b l o c k 3 | . Rotat i o n o f the s h a f t 3 2 w i l l , t h e r e f o r e , cause the b l o c k3 | t o t r a v e l back a nd f o r t h a l o n g t h e s h a f t . S h a f t3 2 i s j o u r n a l l e d adjacent t s ends i n a bracket 3 5.which i s secured t o a s h a f t 3 6 a t r i g ht a n g l e s t othe s h a f t 3 2 a n d p o s i t i o n e d t o one s i d e o f thec e n t e r o f t h e s h a f t 3 2 . Rotation o f the s h a f t 3 6by handwheel 4 4 w i l l , t h e r e f o r e , r e v o l v e t h ebracket 3 5 about the center t h e r e o f . On h a f t 3 2i s a l s o secured a b e v e l pinion 3 1 meshing with asecond b e v e l gear 3 8 l o o s e l y m o u n t e d on s h a f t 3 6 .I f g e a r 3 8 , t h e r e f o r e , i s h e l d s t a t i o n a r y ( a s by l u g3 8 ' ) a nd t h e b r a c k e t 3 5 r e v o l v e d , i t w i l l r e a d i l ybe s e e n t h a t the b l o c k 3 I a n d i t s s t u b s h a f t 3 0w i l l not only be revolved about shaft 3 6 as ac e n t e r bu t w i l l a l s o r e c i p r o c a t e a l o n g the s h a f t 3 2by t h e r o l l i n g o f the b e v e l g e a r ' 3 1 around b e v e lgear 3 8 . I f block 3 | i s s t a r t e d with pin 3 0 conc e n t r i c with s h a f t 3 6 , t h e r e v o l v i n g o f the s h a f t 3 6w i l l cause the pin 3 0 t o execute f i r s t a n outwards p i r a l a n d then a n inward s p i r a l . I n o r d e r ' t h a tt h e o p e r a t o r may e informed _ w h e n s h a f t 3 6 a ndpin 3 0 a r e c o n c e n t r i c , we have shown a pinion 4 0on s h a f t 3 6 meshing with a l a r g e gear 4 I , the gearr a t i o being such that on e turn o f gear 4 I e q u a l sone complete i n a n d o u t s p i r a l o f pin 3 8 . A i n4 2 i s shown on the gear designed t o snap p a s ta s p r i n g c l i c k 4 2 when the s h a f t s 3 6 a n d 3 0 a r ec o n c e n t r i c , s o t h a t t h e o p e r a t o r m a y know whent h e b e a m s i n t h e datum p o s i t i o n .

2 , 0 0 3 , 6 6 1' I h e s p i r a l m o v e m e n t s o f the pin 3 0 are r es o l v e d i n t o azimuth a n d e l e v a t i o n componentsb y r i g h t a n g l e b a r s 2 1 , 2 9 p i v o t e d t h e r e o n , t h e

reciprocating movements f said bars being trans- 'm i t t e d t o p i n i o n s 2 5 , 2 5 ' r e s p e c t i v e l y and t h u sthrough s h a f t 2 4 , 2 4 ' t o t h e d i f f e r e n t i a l s 2 6 a n d2 0 ' . T he t h i r d arm o f s a i d d i f f e r e n t i a l , theref o r e , t u r n s t h e o u t p u t s h a f t 4 3 through a n a n g l e` e q u a l t o the a l g e b r a i c s u m o f t h e m o v e m e n t s o ft h e handwheel I 3 a n d t h e scanning mechanism.Obviously automatic m e a n s may be used t o turns h a f t s I 3 a nd 3 6 , i f d e s i r e d . T r a n s m i t t e r 4 5 ,t h e r e f o r e , on shaft 4 3 transmits both the dat u ma n d scanning m o v e m e n t s o f t h e s e a r c h l i g h t i nazimuth w h i l e t h e c o r r e s p o n d i n g t r a n s m i t t e r 4 5 'on the s h a f t 4 3 transmits the e l e v a t i o n datu ma n d t h e scanning movements. The s p i r a l convolutions a re made suiciently c l o s e so that n oblind area i s l e f t within the norm a l range o ft h e s e a r c h l i g h t . O b v i o u s l y t h e r o t a t i o n o f t h eh a n d wheel 44 may be arrested at a n y time s ot h a t t h e s e a r c h i n g a c t i o n m a y b e s t o p p e d t h e vm o m e n t t h e t a r g e t i s f l i c k e d . A l s o , by havingthe search made n a d e f i n i t e p a t t e r n , the operation may be re v e rs ed a t any time so that the ob- . ~s e r v e r may turn t h e b e a m backwardly i f d e s i r e dt o p i c k u p t h e t a r g e t i f he passed t a t f i r s t .I t i s . n o t d e s i r a b l e , h o w e v e r , t h a t t h e s c a n n i n gmovements s h o u l d reach t h e f o l l o w - t h e - p o i n t e r d i a l s I I a n d I 2 a s t h e s e would d i s t u r b ` the propero p e r a t i o n o f t h e s y s t e m . T h e r e f o r e , a secondd i i e r e n t i a l 2 I (and 2 I ) i s interposed i n whicht h e p l a n e t a r y a r m 4 6 , ( 4 6 ' ) i s operated from t h eshaft 2 4 , ( 2 4 ' ) s o a s t o take out the scanningmove me nts a f t e r they . h a v e been i n t r o d u c e d .S u ch d i f f e r e n t i a l s , however, do not i n t e r f e r e witht h e t r a n s m i t t e r s 4 5 a n d 4 5 ' . I f i t i s d e s i r e d t ocut out the scanning m e c h a n i s m as when sync h r o n i z i n g t h e s e a r c h l i g h t a n d comparator, t h eoperator may u l l ou t s h a f t s 2 4 a n d 2 4 ' by knobs4 1 , 4 1 ' thus d i s c o n n e c t i n g p i n i o n s 2 5 a n d 2 5 a n db r i n g i n g t h e p i n i o n s 2 3 , 2 3 i n t o engagement w i t hs t a t i o n a r y gear 4 8 .F i g . 5 shows in a s o m e wh a t d i f f e r e n t mannerthe s a m e m e ch a n is m shown i n F i g . 2 , c e r t a i np a r t s , h o w e v e r , b e i n g o m i t t e d a nd a d d i t i o n a l f e at u r e s shown, l i k e p a r t s having the s a m e r e f e rence characters. I n t h i s f i g u r e there are shownadditional handwheels I 3 a n d I 5 ' which are ope r a t e d bythe s p o t t e r o r o b s e r v e r , w h i l e t h e handwheels I 3 a n d I 5 a r e operated s o l e l y t o m a t c hthe p o i n t e r s I I , I 4 a n d I 2 , I 6 . Handwheel I 3i s shown s mounted on a long shaft 53 to whichi s pinned a double f a c e clutch member 2 . Saids h a f t 5 3 i s a l s o shown a s extending l o o s e l ythrough the hu b o f t h e handwheel I 3 a n d s provided at i t s u p p e r e n d with a knob 5 4 . Whenhandwheel I 3 i s r o t a t e d with t h e c l u t c h i n t h ep o s i t i o n shown i n F i g , 5 , gear 5 6 which s providedwith a com ple m e nta ry clutch face i s l i k e w i s er o t a t e d , thus rotating the gear 5 I and. on e armofthe d i f f e r e n t i a l 2 0 . As b e f o r e , the scanningmovement s introduced through a shaft 24 a n dpinion 2 3 a n d the r e s u l t a n t m o v e m e n t s t r a n sm i t t e d t h r o u g h f r i c t i o n c l u t c h 5 5 t o t h e s h a f t5 6 , on which are m o u n t e d the transmitter 45 a nda ge ar 5 1 . The l a t t e r drives a g e a r 58 on as l e e v e 5 9 which i s s l i d a b l y bu t n o n - r o t a t a b l ym o u n t e d on a long inne r s l e e v e 6 0 . S l e e v e 5 9 i s y i e l d i n g l y h e l d i n t h e p o s i t i o n shown i n f u l l l i n e si n F i g . 5 by s p r i n g 6 0 " . I f , however, t h e knob5 4 b e pushed i n w a r d l y , c l u t c h 5 2 i s d i s e n g a g e dfrom g e a r 5 0 a nd brought i n t o e ng ag e me nt withthe c l u t c h f a c e 6 I on the u p p e r e n d o f the s l e e v ei 5 9 , a l s o p u s h i n g t h e s l e e v e 5 9 downwardly i n t o

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2 , 0 0 3 , 6 6 1d o t t e d _ _ l i n e p o s i t i o n i n F i g . 5 . T h i s movement r s t d i s c o n n e c t s t h e h a n d l e I l f r o m t h e c o n t r o lo f t h e t r a n s m i t t e r 4 5 and a l s o d i s c o n n e c t s t h eg e a r s 5 1 a nd 5 8 s o t h a t t h e handwheel I ! n ol o n g e r ha s c o n t r o l o f t h e p o i n t e r I 4 . Rotationo f t h e handwheel I 3 ' u n d e r t h e s e c i r c u m s t a n c e sw i l l d i r e c t l y d r i v e t h e g e a r 5 9 t h r o u g h t h e _ s l e e v e6 2 t h u s d r i v i n g t h e . t r a n s m i t t e r . 4 5 therefromw i t h o u t t u r n i n g t h e p o i n t e r I 4 o r t h e b i n o c u l a r sconnected _ t h e r e w i t h a s h e r e i n a f t e r d e s c r i b e d .T h i s c o n t r o l i s mainly u s e d when s y n c h r o n i z i n gt h e s e a r c h l i g h t a n d comparator ' o r t h e soundl o c a t o r and c o m p a r a t o r . The e l e v a t i o n c o n t r o li s s i m i l a r t h r o u g h t h e h a n d v v h e e l s I 5 a n d I 5 ' ,c o r r e s p o n d i n g p a r t s b e i n g s h o w n - b y p r i m e d r e ferencecharacters. _ ' _

. The- opera tion o f t h i s p o r t i o n o f the i n v e n t i o ni s t h a t t h e o p e r a t o r s o f t h e handwheels I l a n dI 5 c o n t r o l t h e s e a r c h l i g h t b e a m by,matchlngp o i n t e r s u n t i l t h e t a r g e t f i s - s i g h t e d . ' t h e v o b s e r v e ra t t h i s t i m e r o t a t i n g h a n d w h e e ' l f 4 4 t o o p e r a t et h e s c a n n i n g mechanism. When t h e t a r g e t i ss i g h t e d through t h e b i n o c u l a r s , the o b s e r v e r r e - vl e a s e s the handwheel 44 a n d a s s u m e s d i r e c t cont r o l t h r o u g h handwheels I 3 and I I ' p r e f e r a b l yw i t h o u t p u s h i n g t h e knobs 5 4 and 5 4 ' i n w a r d l y .B u t t o n s 4 1 , 4 1 ' . m a y b e p u l l e d _ u p w a r d l y a t t h es a m e time s o t h a t the scanning d e v i c e i s a l s or e n d e r e d i n o p e r a t i v e , a l t h o u g h t h i s i s u n n e c e s s a r ya s handwheel 4 4 i s i d l e . The s e a r c h l i g h t i s cont r o l l e d from t h e azimuth an d e l e v a t i o n t r a n s - vm i t t e r s 4 5 a n d 4 5 ' vwhich turn the s e a r c h l i g h tt h r o u g h r e p e a t e r m o t o r s 9 1 a n d 9 1 ' , which _ maybe employed e i t h e r with o r w i t h o u t power m i l i t iplying motors 98 (Fig. l). - ` ' - ` .We l s o p r e f e r to m o u n t the b i n o c u l a r s on thecomparator i n such a m a n n e r that they aremaintained i n t h e d i r e c t i o n o f t h e s e a r c h l i g h t .beam." For t h i s purpose t h e b i n o c u l a r 9 5 i sm o u n t e d d i r e c t l y on th e co m p a r at o r I 0 a n d s i n c et h e comparator r o t a t e s a nd o s c i l l a t e s i n azimutha s t h e handwheels I 3 _and I 4 a r e t u r n e d , thep r o p e r p o s i t i o n i n azimuth i s maintained by t h eb i n o c u l a r s .n e c t i n g t h e s l e e v e 6 9 t o t h e l a r g e g e a r 9 6 whichc a r r i e s the u p p e r o r _ r o t a t a b l e p o r t i o n o f the comp a r a t o r , g e a r 6 6 b e i n g shown a s r o t a t e d from t h es l e e v e 6 0 throughbevel g e a r 8 1 , s h a f t 6 _ 9 andb e v e l gear 6 9 . For m o v e m e n t s in e l e v a t i o n theb i n o c u l a r s are-shown as m o u n t e d-o n a l i n k a g es y s t e m p i v o t e d tothe b l o c k 9 _ 9 ' . There a r e showntwo p a r a l l e l l i n k s 6 9 2 1 1 0 p i v o t ed on t h e - b l o c k a nd

c o n n e c t e d by a c r o s s l i n k 1 I . The b i n o c u l a r sproper a r e i i x e d t o the u p p er l e v e r 8 9 ' s o thatwhen t h e l i n k a g e i s r e v o l v e d o r _ o s c i l l a t e d i nc o u n t e r - c l o c k w i s e d i r e c t i o n i n F i g . 1 , t h e b i n o cu l a r i s t i l t e d upwardly a s s h o w n ' i n d o t t e d l i n e s .' I h e t i l t i n g mo v e me nt o f t h e b i n o c u l a r s i s showna s governed by t h e r o t a t i o n o f ' t h e s l e e v e 9 0 ' .As s h o w n , t h e ' s l e e v e 6 0 ' isconnected throughb e v e l gear 1 0 ' , 1 2 t o f l e x i b l e shaft 1 3 on which i sa worm 14 m eshing with a worm e c t o r 1 5 . l ' l l ' h el a t t e r i s mounted on t h e _ s h a f t 1 9 v o f t h e l e v e r1 0 s o t h a t the l e v e r r o c k s with the w o r m . Theref o r a - t h e b i n o c u l a r s a u t o m a t i c a l l y f o l l o w n o t o n l yt h e main movements o f t h e s e a r c h l i g h t b u t a l s ot h e seanningm'ovements aslong a s t h e h a n d l e - 4 4i s r o t a t e d a n d b u t t o n s 4 1 a n d 4 1 ' remain d o w n . ~This i s highly d e s i r a b l e a s the observeris thenu n c o n s c i o u s t h a t _ei t h e r t h e s e a r c h l i g h t beam o rt h e b i n o c u l a r s a r e o s c i l l a t i n g s i n c e they a r e k e p td i r e c t l y t o g e t h e r a t a l l t i m e s t h e b i n o c u l a r b e i n gd i r e c t e d a t t h e s a m e p o i n t i n t h e heavens a s t h esearchlight. ` ' ' ` .I n F i g . 6 b o t h a m o d i i i e d f o r m o f t h e s c a n n i n g

v p o w e r motor 9 1 .

This i s represented i n F i g . 5 b y con- ~

a r e a around s a i d l o c a t i o n

3d e v i c e and s e a r c h l i g h t c o n t r o l i s s h o w n . I nt h i s ' g u r e t h e a z i m u t h and l e v a t i o n t r a n s m i t t e r sa t the sound l o c a t o r a r e again lshown a t I 9a nd 9 | . I n t h i s c a s e i n s t e a d o f showing a f o ll o w - t h e - p o i n t e r s y s t e m , we have shown ` a c o mp l e t e a u t o m a t i c f o l l o w - u p s y s t em v i n v w h i c h t h es e a r c h l i g h t i s a u t o m a t i c a l l y d r i v e n from t h esound l o c a t o r w i t h o u t h u m a n f o l l o w - u p a " F o r ;t h i s purpose the r e p e a t e r motor I 1 i s shown a s >turning one p o r t i o n l 2 o f a r e v e r s i n g c o n t r o l l e r ,i . e . , t h e r e v o l v i n g t r o l l e y s o r b r u s h e s ' f o r - t h er e v e r s i n g c o n t a c t a r segment 8 3 ( b o t h shown d l agrammatically). The l a t t e r i s m o u n t e d on a_ s h a f t u r i v e n from a . wormwheei a l s v t u r n e df ro m a worm 99 on the shaft o f a r e v e r s i b l eThe p o w e r m o t o r , t h e r e f o r e . yd r i v e s t h e c o n t a c t i n g segment i n t o c o i n c i d e n c e v >w i t h t h e p o s i t i o n o i ' t h e t r o l l e y s . The powermotor a l s o o p e r a t e s t o p o s i t i o n t h e s e a r c h l i g h ti n a z i m u t h . For t h i s p u r p o s e i t i s shown a s driving through worm gearing 9 8 one arm of ad i f f e r e n t i a l _ g e a r t r a i n 8 9 .m ov e m e nt. - I n t h i s instance a continuous r o t at i o n o f a cra nk pin 9 9 on a gear 9 | r e c i p r o c a t e sc o n n e c t i n g r o d 9 2 a nd t h e crank 9 9 c o n n e c t e dV t o the t h i r d a r m o f s a i d d i i f e r e n t i a l . From theplanetary arm s taken o n ' the f i n a l m o v e m e n t_ o f the s e a r c h l i g h t through t h e . pinion 9 4 whichlt u r n s through s h a f t 9 5 t h e t r a n s m i t t e r 9 6 . S a i dt r a n s m i t t e r o p e r a t e s t h e p o w e r f u l r e p e a t e r mot o r 9 1 a t the s e a r c h l i g h t f o r turning the same.The scanning m o v e m e n t may be e i t h e r powerd r i v e n through a motor 9 8 o r c o n t r o l l e d by h a n dthrough a handwheel99, o r b o t h . In e l e v a t i o nthe c o n t r o l may b e s i m i l a r e x c e p t > t h a t i n t h i scase th e scanning m o v e m e n t is such as to causethe s e a r c h l i g h t b e a m t o scan the d e s i r e d i i e l do f m o v e m e n t by a s e r i e s o f advancing s t e p - b ys t e p o r r e c e d i n g m o v e m e n t s , t h e i i n a l e f f e c t b e i n gto move the beam a s indicated i n F i g ' . 7 . Fort h i s purpose t h e r e i s m o u n t e d on the s h a f t ofthe gear 9 i ' d r i v e n from motor 9 8 o r handwheel99 a n eccentric cam | 9 0 having/radially laid-outs t e p s o r t e e t h t o g i v e t h e r e q u i r e d movements t othe cam l e v e r I I I I p i v o t e d a t | 0 2 . Said l e v e rr o c k s t h e t h i r d a r m o f the d i f f e r e n t i a l 9 9 ' , a n dt h e c o m b i n e d movement t u r n s e l e v a t i o n t r a n sm i t t e r ' 9 9 ' , w h i c h o p e r a t e s t r a n s m i t t e r V 9 1through cable |02'. _ 'In a c c o r d a n c e w i t h . t h e p r o v i s i o n s o f t h e p a t e n ts t a t u t e s , we have h e r e i n d e s c r i b e d t h e p r i n c i p l ea n d o p e r a t i o n o f ou r i n v e n t i o n , t o g e t h e r withthe apparatus which we now c o n s i d e r t o represent the best e m b o di m e n t thereof, bu t we e s i r et o have i t understood that t h e apparatus showni s ' o n l y i l l u s t r a t i v e a nd t h a t t h e i n v e n t i o n canbe c a r r i e d o u t by o t h e r means. A l s o , w h i l e i ti s d e s i g n e d . t o u s e the v a r i o u s f e a t u r e s a n d e l ements i n t h e c o m b i n a t i o n a nd r e l a t i o n s d es c r i b e d , some o f t h e s e may e a l t e r e d a nd o t h e r s ` o m i t t e d w i t h o u t i n t e r f e r i n g with t h e more ge ne r a l r e s u l t s o u t l i n e d , a n d t h e i n v e n t i o n extendsto such u s e . '

_ H a vi n g de sc r ib e d our invention, what we claima n d d e s i r e t o s e c u r e by L e t t e r s Patent s :1 . I n a p r e l i m i n a r y p o s i t i o n i n g system f o rs e a r c h l i g h t s , m e a n s f o r a p p r o x i m a t e l y l o c a t i n ga targetby non-optical means,l remote control '

. Y 70 .e a n s f o r d i r e c t i n g t h e s e a r c h l i g h t t h e r e f r o m ,a n d m e a n s f o r introducing at w i l l within s a i d d i

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8/22/2019 Military Searchlight Director (1932)

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4.2 . In a p r e l i m i n a r y p o s i t i o n i n g system ' o r a n t i - _a i r c r a f t s e a r c h l i g h t s , a m e a n s f o r c o n t i n u o u s l y

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vation i n c l u d i n g m e a n s f o r transmitting the a nt i c i p a t e d p o s i t i o n o f t h e s e a r c h l i g h t i n azimutha n d e l e v a t i o n a n d m e a n s o r i n t r o d u c i n g i n t o s a i d ,l a s t named means an s c i l l a t o r y motion t o ca uses a i d s e a r c h l i g h t t o s y s t e m a t i c a l l y ` s c a n a predetermined a r e a around s a i d a n t i c i p a t e d p o s i t i o n t o- pick up he target. ~

3 . In a combined blind--searchlight system f ol o c a t i n g a e r i a l t a r g e t s a t n i g h t , the combinationwith a n o n - o p t i c a l l o c a t o r a n d s e a r c h l i g h t , o fm e a n s controlled f r o m s a i d l o c a t o r a n d remotefrom t h e s e a r c h l i g h t f o r d i r e c t i n g t h e l a t t e r a tthe t a r g e t a s i n d i c a t e d by s a i d l o c a t o r , a s i g h ta t s a i d m e a n s , a n d m e a n s connecting s a i d s i g h ta n d i i r s t named m e a n s t o maintain s a i d s i g h t .pointed a t th e target.

4 . I n a re m ot e control for s e a r c h l i g h t s , meansf o r p o s i t i o n i n g t h e s e a r c h l i g h t i n t h e a n t i c i p a t e dp o s i t i o n i n azimuth a n d e l e v a t i o n , a s i g h t f o rf o l l o w i n g t h e t a r g e t , m e a n s f o r c a u s i n g s a i dsearchlight to sca n a p r e d et e r m in e d a r e a a r o u n ds a i d p o s i t i o n t o f l i c k the t a r g e t , a n d m e a n s f o rcausing s a i d s i g h t t o f o l l o w a l l m o v e m e n t s o f thes e a r c h l i g h t .

5 . I n a sound l o c a t o r system f o r i n i t i a l l y p os i t i o n i n g s e a r c h l i g h t s , the combination with asound l o c a t o r , c o n t r o l s t a t i o n a nd s e a r c h l i g h t ,o f means actuated f r o m th e control station f o rmaintaining the s e a r c h l i g h t p o i n t e d a t the t a rg e t a s i n d i c a t e d by the sound l o c a t o r a n d m e a n sa t the c o n t r o l s t a t i o n f o r s u p e r i m p o s i n g . on suchmotion a l i m i t e d s y s t e m a t i c scanning motionto ca use th e searchlight to s c a n an r e a . a r o u n dt h e i n d i c a t e d p o s i t i o n a t l e a s t e q u a l t o t h e o r d in a ry l i m i t s o f e r r o r o f the sound l o c a t o r .6 . I n a sound l o c a t o r comparator system f o rp o s i t i o n i n g s e a r c h l i g h t s , t h e c o m b i n a t i o n w i t h asound l o c a t o r , comparator a nd s e a r c h l i g h t , m e a n sa c t u a t e d by t h e sound l o c a t o r f o r a c t u a t i n g l nd i c a t o r s a t the comparator, means at the comparator f o r introducing a l i m i t e d scanning m o v ement, m e a n s f o r transmitting the combined i nd i c a t e d a n d scanning movements, a n d m e a n s f o rpreventing l t h e scanning m o v e m e n t s f r o m a i e c tin g said indicators.7 . In a sound l o c a t o r comparator system f o rp o s i t i o n i n g s e a r c h l i g h t s , t h e combination with asound l o c a t o r , comparator a n d e a r c h l i g h t , m e a n sa c t u a t e d by t h e sound l o c a t o r f o r a c t u a t i n g r e l at i v e p o s i t i o n i n d i c a t o r s a t t h e c o m p a r a t o r , a p l ur a l i t y o f m a n u a l m e a n s a t the comparator f o r _ governing the s e a r c h l i g h t , c e r t a i n o f s a i d m e a n sb e i n g o p e r a t e d b y m a t c h - t h e - p o i n t e r o p e r a t o r st o maintain the proper r e l a t i o n b e t w e e n . s a i dr e l a t i v e p o s i t i o n i n d i c a t o r s , another o f s a i d m e a n sb e i n g i n i t i a l l y o p e r a t e d b y t h e t a r g e t o b s e r v e r t osuperimpose a scanning movement, a n d anotherof said means or operation bythe observer aftert h e t a r g e t i s s i g h t e d whereby t h e s e a r c h l i g h t cont r o l may e t r a n s f e r r e d from s a i d p o i n t e r operat o r s a n d f ro m s a i d scanning m e a n s t o s a i d l a s tnam-ed c o n t r o l m e a n s when the t a r g e t v i s onces i g h t e d .Y 8 . I n a sound l o c a t o r comparator system f o rp o s i t i o n i n g s e a r c h l i g h t s , t h e combination with asou nd l o c a t o r , co m p a r a tor a n d s e a r c h l i g h t , meansa c t u a t e d by t h e sound l o c a t o r f o r a c t u a t i n g r e l at i v e p o s i t i o n i n d i c a t o r s a t t h e comparator, m e a n sa t the comparator f o r introducing a l i m i t e d scanning move m e nt, a p l u r a l i t y o f m a n u a l m e a n s a tt h e comparator . f o r g o v e r n i n g t h e s e a r c h l i g h t ,c e r t a i n o f s a i d m e a n s b e i n g o p e r a t e d by m a t ch

a o o a e c i ~ ~t h e - p o i n t e r o p e r a t o r s t o maintain t h e p r o p e r r e - vl a t i o n b e t w e e n s a i d r e l a t i v e p o s i t i o n i n d i c a t o r sa nd o t h e r s o f s a i d m e a n s b e i n g o p e r a t e d by t a r g e to b s e r v e r , a n d m e a n s whereby s a i d o b s e r v e r mayc u t o u t s a i d s c a n n i n g mo v e me nt a n d t r a n s f e r t h e 5s e a r c h l i g h t c o n t r o l from s a i d p o i n t e r o p e r a t o r st o t h e o b s e r v e r when t h e t a r g e t i s once s i g h t e d .9 . I n a remote control for s e a r c h l i g h t s , m e a n sf o r ' p o s i t i o n i n g t h e s e a r c h l i g h t i n _ a p r e d i c t e d pos i t i o n i n e l e v a t i o n a n d azimuth i n c l u d i n g m e a n s l 0f o r t r a n s m i t t i n g s a i d p r e d i c t e d p o s i t i o n I _ i n a z imuth, m e a n s f o r t r a n s m i t t i n g s a i d p r e d i c t e d p o s it i o n i n > e l e v a t i o n , and m e a n s f o r i n t r o d u c i n g i n t oeach o f s a i d m e a n s s i m u l t a n e o u s l y a c o n t i n u o u s l yi n c r e a s i n g t o a nd f r o motion w h e r e b y - s a i d s e a r c h - 1 5l i g h t i s caused t o m o v e i n a n outwardly e x p a n di n g s p i r a l around s a i d p r e d i c t e d p o s i t i o n o i ' su mc i e n t l y c l o s e c o n v o l u t i o n s t o l e a v e no b l i n d a r e a ~within the n o r m a l r a n g e of th e searchlight. ~1 0 . I n a remote control for s e a r c h l i g h t s , m e a n s 2a t t h e c o n t r o l s t a t i o n f o r s e t t i n g u p the i n d i c a t e dazimuthal p o s i t i o n o f t h e s e a r c h l i g h t beam, m e a n sf o r s e t t i n g u p t h e e l e v a t i o n a n g l e . a nd m e a n sf o r i n t r o d u c i n g a t the c o n t r o l s t a t i o n a supplementary scanning m o v e m e n t i n t h e s e a r c h l i g h t 2 5comprising a m e m b e r , m e a n s f o r r e v o l v i n g s a i dm e m b e r i n a s p i r a l p a t h , m e a n s f o r r e s o l v i n g t h emovements o f s a i d m e m b e r i n t o r i g h t a n g u l a rc o m p o n e n t s , a nd azimuth a n d e l e v a t i o n t r a n s m i tt i n g m e a n s each a c t u a t e d j o i n t l y by s a i d azimuth 3 0a n d e l e v a t i o n p o s i t i o n i n g m e a n s a n d the c o r r esponding components o f s a i d scanning means.1 1 . I n a remote c o n t r o l f o r a n t i - a i r c r a f t searchl i g h t s , m e a n s f o r . i n d i c a t i n g t h e approximate pos i t i o n o i ' t h e a i r c r a f t , primary t r a n s m i t t i n g m e a n s 3 5f o r d i r e c t i n g s a i d s e a r c h l i g h t i n both a z i m u t hand e l e v a t i o n toward s a i d p o s i t i o n . and manualm e a n s o p e r a b l e a t w i l l f o r introducing a co m p a ra t i v e l y r a p i d t o a nd f r o compon e nt i n on e o f - s a i dvtransmitting m e a n s a n d a . slower motion i n the 4 0o t h e r o f s a i d means, whereby the b e a m s causedt o search i n a p r o g r e s s i v e z i g z a g f a s h i o n .1 2 . I n a remote c o n t r o l f o r s e a r c h l i g h t s , m e a n sf o r transmitting the azimuthal p o s i t i o n t o thesearchlight, means f o r transmitting the e l e v a . - 4 5 `t i o n a n g l e , a nd m e a n s f o r i n t r o d u c i n g a s u p p l ementary scanning m o v e m e n t i n each o f s a i dt r a n s m i t t i n g m e a n s comprising m e a n s f o r i n t r oducing a constant r e c i p r o c a t o r y m o v e m e n t i n oneo f ' s a i d t r a n s m i t t i n g m e a n s about s a i d p o s i t i o n , 5 0 . 'a n d m e a n s f o r causing a s t e p - b y - s t e p p r o g r e s s i v em o v e m e n t i n s a i d o t h e r t r a n s m i t t i n g means.

' 1 3 . I n a r e m o te control for searchlights, meansf o r t r a n s m i t t i n g t h e a z i m u t h a l p o s i t i o n t o t h e ls e a r c h l i g h t , lmeans f o r " t s a n s n ' i i t t i n g t h e ' e l e v a - 5 5t i o n a n g l e , a nd _ m e a n s f o r i n t r o d u c i n g a s u pp l e m e n t a r y s c a n n i n g move m e nt i n v t h e s e a r c hl i g h t comprising a m e m b e r , m e a n s f o r r e v o l v i n gs a i d m e m b e r i n a s p i r a l p a t h , m e a n s f o r r e s o l v - 6 0i n g t h e movements o f s a i d m e m b e r i n two r i g h ta n g u l a r components, m e a n s f o r i n t r o d u c i n g s a i dcomponents i n t o s a i ' d , azimuth a nd e l e v a t i o nt r a n s m i t t i n g m e a n s r e s p e c t i v e l y . a nd m e a n s f o ri n d i c a t i n g when s a i d y m e m b e r i s a t l t h e , c e n t e r 6 5or origin of it s s p ir a l. .

14 - I n a c o m b i n e d blind-searchlight systemf o r l o c a t i n g a e r i a l t a r g e t s a t n i g h t , t h e combination with a non-optical l o c a t o r a n d searchl i g h t , o f m e a n s c o n t r o l l e d f ro m s a i d l o c a t o r a n d 7 0r e m o t e from t h e - s e a r c h l i g h t f o r d i r e c t i n g t h e l a tt e r ' a t t h e t a r g e t a s i n d i c a t e d by s a i d l o c a t o r , as i g h t a t s a i d means. m e a n s connecting s a i d s i g h ta n d first-named m e a n s t o maintain s a i d s i g h tp o i n t e d a t t h e t a r g e t , a n d m e a n s w h e r e b y t h e 7 5

8/22/2019 Military Searchlight Director (1932)

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2 , 0 0 3 , 6 6 1s i g h t obrver m a y assmne c o n t r o l o f t h e s e a r c hl i g h t upon t h e t a r g e t b e i n g i c k e d .

j 1 5 . In a remote c o n t r o l f o r s e a r c h l i g h t s , m e a n sf o r p o s i t i o n i n g t h e s e a r c h l i g h t i n t h e a n t i c i p a t e dp o s i t i o n i n azimuth a n d e l e v a t i o n , a s i g h t f o r f o ll o w i n g t h e t a r g e t , m e a n s f o r c a u s i n g s a i d s e a r c hl i g h t t o scan a > predetermined area a round s a i dp o s i t i o n t o f l i c k t h e t a r g e t , m e a n s f o r c a u s i n gs a i d s i g h t t o f o l l o w a l l move me nts o f the searchl i g h t , a n d m e a n s whereby the s i g h t o b s e r v e r mayas s u m e c o n t r o l o f the s e a r c h l i g h t u p o n the t a rge t being f l i c k e d .1 6 . I n a n o n - o p t i c a l l o c a t o r comparator/systemf o r p o s i t i o n i n g s e a r c h l i g h t s , t h e c o m b i n a t i o n w i t ha n o n - o p t i c a l l o c a t o r , comparator a n d s e a r c hl i g h t , m e a n s a c t u a t e d by t h e l o c a t o r f o r a c t u a tin g i n d i c a t o r s a t the comparator, m e a n s a t thecomparator f o r i n t r o d u c i n g a l i m i t e d s c a n n i n gmove m e nt, a n d m e a n s f o r transmitting the comb i n e d i n d i c a t e d and s c a n n i n g m o v e m e n t s .

V 1 7 . I n a s o u n d locator c o m p a r a to r s y s t e m f orp o s i t i o n i n g s e a r c h l i g h t s , the combination with a `somidlocator, c o m p a r a t o r and earchlight, means

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a c t u a t e d by t h e sound l o c a t o r f o r a c t u a t i n g i n d ic a t o r s a t ' t h e comparator, m e a n s a t the comp arat o r f o r i n t r o d u c i n g a l i m i t e d s c a n n i n g movement.m e a n s f o r t r a n s m i t t i n g t h e combined i n d i c a t e da nd s c a n n i n g movements, m e a n s f o r p r e v e n t i n gt h e scanning movements from a ' f f e c t i n g s a i d i n d ic a t o r s , a n d m e a n s whereby t h e s e a r c h l i g h t maybe c o n t r o l l e d d i r e c t l y from s a i d comparator witho u t i n t e r f e r e n c e iromany o f said o t h e r means.1 8 . I n a remote c o n t r o l system f o r s e a r c h l i g h t s ,a s i g h t , a fra me on'which the s a m e i s m o u n t e df o r mo v e m e nts i n e l e v a t i o n , a s u p p o r t i n which

5s a i d trame i s p i v o t e d f o r t u r n i n g i n a z i m u t h ,handwheels f o r moving s a i d s i g h t i n a z i m u t h 'and e l e v a t i o n , t r a n s m i t t e r s a c t u a t e d by s a i dh a n d w h e e l s , a nd r e p e a t e r motors a t t h e s e a r c hl i g h t a c t u a t e d from s a i d t r a n s m i t t e r s f o r main 5 .taining/the sight 'and beam ointed at a commonp o i n t i n t h e h e a v e n s .

1 9 . In a remote c o n t r o l system f o r s e a r c h l i g h t s ,a s i g h t , a f r a m e on which the s a m e i s m o u n t e df o r m o v e m e n t s i n e l e v a t i o n , a support i n whichs a i d f r a m e i s p i v o t e d f o r t u r n i n g i n a z i m u t h ,handwheels f o r moving s a i d s i g h t i n azimuth a nde l e v a t i o n both m o u n t e d f o r r e v o l u t i o n i n azimuthw i t h s a i d f r a m e , t r a n s m i t t e r s a c t u a t e d by s a i dh a n d w h e e l s , a n d r e p e a t e r motors a t t h e s e a r c hl i g h t actuated f rom s a i d t r a n s m i t t e r s f o r m a i nt a i n i n g the s i g h t a n d b e a m pointed a t a commonp o i n t i n t h e heavens a n d whereby t h e o p e r a t o ro b s e r v e r always f a c e s toward t h e s e a r c h l i g h tbeam. -2 0 . I n a n o n - o p t i c a l l o c a t o r system f o r i n i t i a l l yp o s i t i o n i n g s e a r c h l i g h t s , the combina tion with an o n - o p t i c a l l o c a t o r , c o n t r o l d e v i c e a nd s e a r c hl i g h t , o f m e a n s actuated f ro m the c o n t r o l d e v i c ef o r m a i n t a i n i n g t h e s e a r c h l i g h t p o i n t e d a t t h et a r g e t as i n d i c a t e d by s a i d l o c a t o r , a n d m e a n sa t the c o n t r o l d e v i c e f o r superimposing on s a i dmotion a l i m i t e d systematic scanning motion t oca use the searchlight to sc a n an re a a r o u n d thei n d i c a t e d p o s i t i o n , s a i d m e a n s p e r m i t t i n g s a i dscanning motion t o be s t o p p e d o r r e v e r s e d fromt h e c o n t r o l d e v i c ' e a t w i l l .

PRESTON R. B A S S E ' I ' I .FRANK . HOUSE.

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