Particulars of the U.S. Steam Sloop Pocahontas
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836 :For tlle ffournal of ~ho Franklin Institute. _Particulars of the lf. S. Steam Sloop -Pocahontas. HuH built by U. S. Government at Gosport Navy Yard. M:~chinery origln~lly built by H~rrisoa Loring, of :Boston; rebuilt at the Gosport ~avy Yard. Length from knighthcad to taffrail, 171 feet. " on load w~te, r line, . 154 ,, Breadth of beam, extreme, . 30 " 4 inches. ])ep, h ef hold, . 13 '" 6 ., Length uf engine and boiler space, . 30 ,, ])raft of water, . • 12 *~ Displacement at load dr,aft, . 775 tons. Tonnage, 694 " E.~L~Es.--Two--Vertical direct action. Diameter of cyFinder, . 33 inches. Length of stroke, 2 feet 6 ,, Diameter of shaft, . 8 " Cut-off-- llxed slide--half-stroke. ]Maximum pressure of steam, 20 lbs. " revolutions, 70. :BOILEas.--Two--Martin's vertical tubular. Length of boilers, 11 feet. V¢idth " • • 9 " 3 inches. Height " exclusive of steam chimney, 9 " 6 " " " inclusive " 13 ~' 6 " Furnaces in each boiler, • 3. ]3rea,hh of furnace, ' 2 " 5 " ]~ength of grate bars, . 6 '~ ]Numbel" of tubes (iron), 1260. Length of tube, 2 " 3 " E×tcrnaldiameter, . 2 " Grate surface, 87 sq. ft. Heating surface, . 2251 " Diameter of smoke pipe, . 4 " 5 " Height " above grates, . 44. " ScR~w.--Uniform. Diameter, . 10 :feet. Length at hub, , . 2 " " periphery, 1 " Pitch, . 18 " :Number of blades, 2. 9 inches. Remarks.--Durlng a trial at sea, March 27, 1860, speed 8 knots. Revolutions, 59. Steam, 15 lbs. J.H.W. Effect of 1Pressure on J~leetro-eonducblng .Power. M. Erie Wartmann has found experimentally that the electric con- ductibility of copper wire is sensibly diminished by a pressure of 50 atmospheres, that this diminution increases with the pressure, and dis- appears when the pressure is relieved. The experiments were carried up to 400 atmospheres. These results establish ~ new analogy between . . , , heat, light, and e eetr~clty.--.L Znstztut.
Transcript of Particulars of the U.S. Steam Sloop Pocahontas
836
:For t l l e f f o u r n a l o f ~ho F r a n k l i n I n s t i t u t e .
_Particulars of the lf. S. Steam Sloop -Pocahontas. HuH built by U. S. Government at Gosport Navy Yard. M:~chinery
origln~lly built by H~rrisoa Loring, of :Boston; rebuilt at the Gosport ~avy Yard.
L e n g t h from kn igh thcad to taffrail, 171 fee t . " on load w~te, r line, . 154 ,,
B read th of beam, ex t reme, . 3 0 " 4 inches . ] )ep, h ef hold, . 13 '" 6 ., L e n g t h uf eng ine and boiler space, . 3 0 ,, ] ) raf t of water, . • 12 *~ Disp lacement at load dr,aft, . 775 tons. T o n n a g e , 694 "
E . ~ L ~ E s . - - T w o - - V e r t i c a l d i rec t action.
D i a m e t e r of cyFinder, . 33 inches . L e n g t h of stroke, 2 f e e t 6 ,, D iamete r of shaft , . 8 " Cut-off - - llxed s l ide- -ha l f - s t roke . ]Maximum pressure of s t eam, 20 lbs.
" revolutions, 70.
:BOILEas . - -Two- -Mar t in ' s ver t ical tubular .
L e n g t h of boilers, 11 f ee t . V¢idth " • • 9 " 3 inches . H e i g h t " exclusive of s team c h i m n e y , 9 " 6 "
" " inclusive " 13 ~' 6 " F u r n a c e s in each boiler, • 3. ]3rea,hh of furnace, ' 2 " 5 " ]~ength of g ra te bars, . 6 '~ ]Numbel" of tubes ( i ron) , 1260. L e n g t h of tube, 2 " 3 " E × t c r n a l d i a m e t e r , . 2 " Gra te surface, 87 sq. ft. H e a t i n g surface, . 2251 " D i a m e t e r of smoke pipe, . 4 " 5 "
H e i g h t " above grates, . 44. "
ScR~w. - -Un i fo rm.
Diamete r , . 10 :feet. L e n g t h at hub, , . 2 "
" per iphery, 1 " P i tch , . 18 " :Number of blades, 2.
9 i n c h e s .
Remarks.--Durlng a trial at sea, March 27, 1860, speed 8 knots. Revolutions, 59. Steam, 15 lbs. J . H . W .
Effect of 1Pressure on J~leetro-eonducblng .Power. M. Erie Wartmann has found experimentally that the electric con-
ductibility of copper wire is sensibly diminished by a pressure of 50 atmospheres, that this diminution increases with the pressure, and dis- appears when the pressure is relieved. The experiments were carried up to 400 atmospheres. These results establish ~ new analogy between
. . , , heat, light, and e eetr~clty.--.L Znstztut.
