Abstract

Two photometric devices are described. Each of these devices employs modulated tungsten filament lamps. In the first the lamps are electrically independent of the detector. In the second a feed-back arrangement is used. These devices should prove useful for transmission or reflection measurements of neutral or colored materials.

© 1950 Optical Society of America

A Photometric Separator for Precision Visual Spectrophotometry

J. Terrien and F. Desvignes
J. Opt. Soc. Am. 40(12) 845-848 (1950)

New Automatic Colorimeter for Cotton

Dorothy Nickerson, Richard S. Hunter, and Marshall G. Powell
J. Opt. Soc. Am. 40(7) 446-449 (1950)

Measurement of Photographic Transmission Density*

K. S. Weaver
J. Opt. Soc. Am. 40(8) 524-536 (1950)

Objectives and Methods of Density Measurement in Sensitometry of Color Films*

Franklin C. Williams
J. Opt. Soc. Am. 40(2) 104-112 (1950)

Construction of a Double Beam Recording Infra-Red Spectrophotometer

John U. White and Max D. Liston
J. Opt. Soc. Am. 40(1) 29-35 (1950)