Abstract

A visibility curve depending on about 15 observers has been taken at an intensity comparable to the lowest used in darkroom work. A series of determinations of the wave-length of maximum visibility for several intensities and observers has also been made giving a curve extending from near the dark adapted threshold to about 2 foot lamberts. The observations were all made with the natural pupils and binocular vision. Comparisons with some previous work of other authors are made. The wave-length of maximum visibility at the highest intensity corresponds very closely with that of the standard I.E.S. photopic curve. At the lower levels, values are found approximating those given by König in his complete curve, and by Hecht for an intensity 2.7 times the dark adapted threshold.

© 1937 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
On the Precision of Photometric Observations

Alfred H. Holway
J. Opt. Soc. Am. 27(3) 120-123 (1937)

The Optical Properties of Polaroid for Visible Light

Martin Grabau
J. Opt. Soc. Am. 27(12) 420-424 (1937)

Brightness of Cathodo-Luminescence at Low Current Densities and Low Voltages

Thomas B. Brown
J. Opt. Soc. Am. 27(5) 186-192 (1937)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription