Colorimeter
name: label: used by
content: Judd, Deane B.
label: maker
content: Bellingham & Stanley Ltd.
notes: label: Description
content: R. Donaldson, a scientist with of the Optics Division of the British National Physical Laboratory, developed his "trichromatic" colorimeter in 1935. This photoelectric instrument became as accurate and efficient as the one that J. Guild had developed for the NPL in the 1920s, but simpler and less expensive. Like Guild, Donaldson created colors by combining different amounts of three primary colors. His instrument, however, had no moving parts and ran on either direct or alternating current. The Donaldson colorimeter was soon used extensively in industry and regarded as the most convenient of the instruments that measured light in three colors.
label: Description
content: This example was used at the U.S. National Bureau of Standards by Deane B. Judd and other scientists working to establish color standards (a second tag reads "NATIONAL BUREAU OF STANDARDS 94605"). It passed to the Department of Chemistry at the Rensselaer Polytechnic Institute, and came to the Smithsonian in 1981. The inscription reads "DONALDSON COLORIMETER MADE BY BELLINGHAM & STANLEY, LTD. LONDON NO. 43883 MADE IN ENGLAND."
label: Description
content: Ref: Adam Hilger, Ltd., <i>The Donaldson Trichromatic Colorimeter</i> (London, 1947).
label: Description
content: R. Donaldson, "A Trichromatic Colorimeter," <i>Proceedings of the Physical Society</i> 47 (1935): 1068-1073.
label: Description
content: R. Donaldson, "A Colorimeter with Six Matching Stimuli," <i>Proceedings of the Physical Society</i> 59 (1947): 554-560.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London
topic: label: Subject
content: Color
label: Subject
content: Optics
label: Subject
content: National Bureau of Standards
setName: label: See more items in
content: Medicine and Science: Chemistry
label: See more items in
content: Saccharimeters
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: Rensselaer Polytechnic Institute, Department of Chemistry
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1981.0496.06
label: catalog number
content: 1981.0496.06
label: accession number
content: 1981.0496
objectType: label: Object Name
content: Colorimeter
physicalDescription: label: Physical Description
content: aluminum (overall material)
label: Physical Description
content: porcelain (overall material)
label: Measurements
content: lamp housing top: 12.8 cm; 5 1/32 in
label: Measurements
content: lamp housing: 23 cm x 10.2 cm; 9 1/16 in x 4 in
label: Measurements
content: frame: 27 mm x 206 mm x 255 mm; 1 1/16 in x 8 1/8 in x 10 1/16 in
label: Measurements
content: housing: 32 cm x 54.7 cm x 73 cm; 12 5/8 in x 21 9/16 in x 28 3/4 in
label: Measurements
content: overall: 53 in x 39 in x 89 in; 134.62 cm x 99.06 cm x 226.06 cm