Abstract
The design modification and performance of a photoelectric differential refractometer originally designed by the late Dr. B. A. Brice of the U. S. Department of Agriculture is described. The instrument consists of a mercury lamp light source, monochromatic filters, variable slit, beam splitter, light path consisting of a blackened tube, divided cell containing sample and solvent, lens, surface mirror reflecting the light back through the blackened tube to the beam splitter, and a matched pair of photocells mounted on a movable flat carriage. The slit image is detected by manipulating the carriage until the slit image is exactly between the two photocells. A nullmeter is used to determine this point. The main advantages of the photoelectric differential refractometer over previous designs is freedom from eyestrain, ease of operation, and linearity of operation.
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