Abstract

This spectrophotometer was designed specifically to measure in the visible region the absorption spectrum of visual purple, the photosensitive substance of the retinal rods. It is independent of both the photoelectric cell and amplifier characteristics, relying only on the law of crossed polarizing prisms. The sensitivity of the detecting system is high enough so that the measuring light produces no detectable effect upon the measured solution. The entire system can measure a transmission of 1 percent to a precision of about 1 percent.

© 1938 Optical Society of America

Calibration and Operation of the General Electric Recording Spectrophotometer of the National Bureau of Standards*†

Kasson S. Gibson and Harry J. Keegan
J. Opt. Soc. Am. 28(10) 372-385 (1938)

Construction of the General Electric Recording Spectrophotometer*

J. L. Michaelson
J. Opt. Soc. Am. 28(10) 365-371 (1938)

A Recording Photoelectric Spectroradiometer

V. M. Albers and H. V. Knorr
J. Opt. Soc. Am. 28(4) 121-123 (1938)

Transmission Measurements with the Beckman Quartz Spectrophotometer

Kasson S. Gibson and Margaret M. Balcom
J. Opt. Soc. Am. 37(8) 593-608 (1947)

The Astigmatism of the Concave Grating as a Means of Calibrating Photographic Plates in Intensity Measurements*

Mary Ignace Bresch
J. Opt. Soc. Am. 28(12) 493-499 (1938)