A Simple Photox Photometer Head
JOSA, Vol. 29, Issue 1, pp. 35-36 (1939)
http://dx.doi.org/10.1364/JOSA.29.000035
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Abstract
A null-reading photometer head is described which employs a Photox cell integrally mounted with a graphite-graphite commutator in such manner that the direct current in an external instrument is reversed synchronously with the exposure of the cell to standard and unknown source. The candlepower of a Mazda lamp may be read directly on a permanent scale.
Citation
EARL D. WILSON, "A Simple Photox Photometer Head," J. Opt. Soc. Am. 29, 35-36 (1939)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-29-1-35
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