A concentric cylinder apparatua for the studia of flow dichrokm in polymer solutions ie described in d e a . The outer and inner cylindem are both made of fused quartz which ia tr+arent in A b l e and ultraviolet region down t o 220 m9. The velocity gradient ie produced in eolution in the gap between the cylinders by rotating the inner one.The light p& is deaigned to be perpendicular to the axia of rotation of the quartz cylinder. A diffehntial device maka it p d b l e to measure the difference in abeorption coefficiente, cu and 61, which are the absorption coe5cienta measured by plane-polarized light having parallel and perpendicular electric vector with the stream line. The apparatus ia found to be w f u l for studying the regularity of orientation of chromophom in bot,h synthetic and binlogical polymer chains.

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