Merck Institute of Therapeutic Research, Rahway, New Jersey
No abstract available.
H. W. Lamson, Rev. Sci. Inst. 9, 272 (1938).
A. C. Hardy, J. Opt. Soc. Am. 18, 96 (1929); J. Opt. Soc. Am. 25, 305 (1935).
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1. Photo-cell and amplifier. 2. Prism of spectrophotometer. 3. Photometer assembly. 4. Light modulator, 5. Sample tubes. 6. Light source. 7. Cathode-ray tube.
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Schematic diagram of circuit.