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Schematic diagram o f the experimental s e t up t o detect l i gh t scattered by bend fluctuations, The magnetic f i e l d N applied perpendicular to the plane of the paper produces a twist distortion i n the medium. For the sake of c lar i ty , the thickness of the sample i s very much exaggerated compared t o that of the g lass plate.

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Scheumtic diagram of the wed@ ahaped Cwisteii nonatic cell used Lo dotermine thrz dependence of TART on 1 Our1 2 1 , The dots md dashes rapresent the eaay axes id alignment.

0 In the actual experiment, the . twir i t w1gI.c bins rJ_ 75 .

FIGURE 2*3 --

Arrangement to measure the thickness of the sample by forming the cha~nel led spectrum.

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Magnetic f i e l d dependence of the shift i n

*AN for a 25 m thick sample of CBOOA

Magnetio field ilependcance o f the ishift &n

TAN for a 25 pm thick sample of 8 WB.

Variation o f TAN wilth for CBOOA. 6 2

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Vast ation of 'Ern with 6b/zx- for 8 OCB. Two curves represent two inclepenclarkt merlaurerclents wieb two different c e l l s .