The Sharp-Millar photometer is a portable instrument suitable for measuring the output of lamps in service. A brass tag on this example reads “TYPE . . . SERIAL NO. 1681 / PATENT NO. 960420 / Foote Pierson & Co. / 160-162 DUANE ST. / NEW YORK.” Clayton H. Sharp (1869-1942) was a graduate of Hamilton College and Cornell University (PhD), and technical director of the Electrical Testing Laboratories in New York City. Preston S. Millar (1880-1949) was president of the Electrical Testing Laboratories.

Ref: Clayton H. Sharp and Preston S. Millar, “Photometer,” U.S. Patent 960420 (June 10, 1910).

“Dr. Clayton Sharp, Engineer, Was 72,” New York Times (May 14, 1942), p. 19.

Maker: Foote, Pierson & Co.

Location: Currently not on view

Place Made: United States: New York, New York

See more items in: Medicine and Science: Physical Sciences


Exhibition Location:

Credit Line: U.S. Weather Bureau

Data Source: National Museum of American History

Id Number: PH.319821Catalog Number: 319821Accession Number: 240347

Object Name: Photometer

Measurements: overall: 6 3/8 in x 5 3/16 in x 27 3/8 in; 16.1925 cm x 13.17625 cm x 69.5325 cm


Record Id: nmah_1167279

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