A new method of heterochromatic photometry

• Published in: Journal of experimental psychology Vol. 1; no. 1; pp. 1 - 12
• Main Authors: Ferree, C. E, Rand, Gertrude
• Format: Journal Article
• Language: English
• Published: Washington, etc Psychological Review Company 01-02-1916; American Psychological Association
• Subjects: Evaluation; Illumination; Methodology
• ISSN: 0022-1015; 1946-1941
• DOI: 10.1037/h0068170

Briefly describes a
method of photometry which possesses approximately as high a degree of sensitivity and of
reproducibility as the method of flicker and gives results which agree very closely on the
average with those obtained by the equality of brightness method, much more closely than
results obtained by the method of flicker. It was first used by the writers in connection
with work in color sensitivity for the purpose of detecting small changes on the
illumination of a room by daylight. Although not so convenient perhaps as the equality of
brightness method for many of the purposes for which photometry may be used, for this work
the method did not present any great amount of difficulty, and it proved to be much more
sensitive than the equality of brightness method.