Abstract

A description is given of the application of the electron-multiplier photo-tube and the light-chopping method to the design of a densitometer. The techniques discussed are generally applicable to the measurement of very low light intensities.

© 1946 Optical Society of America

Recording Infra-Red Analyzers for Butadiene and Styrene Plant Streams*

N. Wright and L. W. Herscher
J. Opt. Soc. Am. 36(4) 195-202 (1946)

Photographic Use of Electrical Discharge Flashtubes

Harold E. Edgerton
J. Opt. Soc. Am. 36(7) 390-399 (1946)

Light Sum of Phosphors under Thermal and Infra-Red Stimulation*

R. T. Ellickson
J. Opt. Soc. Am. 36(5) 264-269 (1946)

Causes of Early Loss of Light Output of Fluorescent Lamps

George Meister and Rudolph Nagy
J. Opt. Soc. Am. 36(12) 696-701 (1946)

A Light Source for the Primary Standard of Wave-Length*

Chao-Wang Hsueh
J. Opt. Soc. Am. 36(3) 160-164 (1946)