A photometer has been built for fluctuation studies of liquid mixtures near the critical point with thermostats controlled to 0.001°. The instrument has provisions for a choice of light sources and detection systems, and is capable of absolute scattered intensity measurements of dilute polymer solutions over a wide temperature range. It can also be converted to a spectrophotometer with a variable angular acceptance for the phototube, so that the effect of forward scattering on turbidity measurements may be examined.
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B. Chu (1964) studied this question.
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