Abstract

A visual photometer has been devised which facilitates observations in the mesopic and scotopic ranges. By a special mechanical construction the observer is enabled to record about 60 readings without the necessity of removing his eye from the eyepiece of the instrument. Apart from its control box, the instrument is easily held in the hand. The field has an apparent diameter of 12 degrees, and is divided vertically.

© 1954 Optical Society of America

A Design for an Absolute Light-Scattering Photometer

Lawrence M. Kushner
J. Opt. Soc. Am. 44(2) 155-159 (1954)

An Integrating Photometer for Low Light Levels

Horace W. Babcock
J. Opt. Soc. Am. 40(7) 409-411 (1950)

Dark Adaptation to Intermediate Levels and to Complete Darkness*

Robert G. Hattwick
J. Opt. Soc. Am. 44(3) 223-228 (1954)

Relationship between Critical Flicker-Frequency and a Set of Low-Frequency Characteristics of the Eye

H. de Lange Dzn
J. Opt. Soc. Am. 44(5) 380-389 (1954)

A Study in Binocular Flicker

Fred H. Perrin
J. Opt. Soc. Am. 44(1) 60-69 (1954)