Abstract

Shortly after the introduction of commercially available photoelectric spectrophotometers, the National Bureau of Standards began issuing calibrated disks for checking the photometric scale of spectrophotometers. At the time these standards were selected no precise information was available regarding their permanence. Recent measurements show that the glass standards kept in the files for 16 years with only occasional use have not changed. Data have also been obtained showing the nature of the changes occurring in glasses similar to the standards when exposed under glass to south skylight (including sunlight) for periods up to nearly three years.

© 1950 Optical Society of America

Recalibration of the NBS Glass Standards of Spectral Transmittance*

Harry J. Keegan, John C. Schleter, and Marion A. Belknap
J. Opt. Soc. Am. 54(1) 69-74 (1964)

An Alkaline Solution of Potassium Chromate as a Transmittancy Standard in the Ultraviolet*

Geraldine Walker Haupt
J. Opt. Soc. Am. 42(7) 441-447 (1952)

New Automatic Colorimeter for Cotton

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

Wave-Lengths of Mercury 198

William F. Meggers and Karl G. Kessler
J. Opt. Soc. Am. 40(11) 737-741 (1950)

Polarization Studies of Light Diffusely Reflected from Ground and Etched Glass Surfaces

William A. Rense
J. Opt. Soc. Am. 40(1) 55-59 (1950)