The Harrold Exposure Scale
date: label: date made
content: after 1922
name: label: maker
content: Harrold, Elmer
notes: label: Description (Brief)
content: Exposure scale for photography. The white backboard carries three dials: yellow, green, and pink. The directions are on the back. There are settings for date and time, condition of sky, and different kinds of plates and films.
label: Description
content: The “ELMER HARROLD / LEETONIA, OHIO” inscription on this photographic exposure scale refers to Elmer Harrold (1864-1931), a machinist, photographer, and amateur astronomer who received a copyright on the design in 1922, and a patent in 1923.
label: Description
content: Ref: Elmer Harrold, “Exposure Meter,” U.S. Patent 1,478,956 (Dec. 25, 1923).
label: Location
content: Currently not on view
place: label: place made
content: United States: Ohio, Leetonia
setName: label: See more items in
content: Medicine and Science: Chemistry
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content: Celluloid
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content: Photography
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2006.0098.0515
label: accession number
content: 2006.0098
label: catalog number
content: 2006.0098.0515
objectType: label: Object Name
content: exposure scale
physicalDescription: label: Physical Description
content: cellulose nitrate (overall material)
label: Measurements
content: overall: 7 cm x 10 cm; 2 3/4 in x 3 15/16 in
label: Measurements
content: overall: 1/16 in x 2 11/16 in x 3 7/8 in; .15875 cm x 6.82625 cm x 9.8425 cm