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Robert E. Klett was a native of Berlin who immigrated to the U.S. in 1905, established the Klett Manufacturing Co. in New York in 1916, and specialized in Duboscq-type colorimeters that, because of the war in Europe, were no longer available in the United States. This example is based on his 1928 patent for a colorimeter that, with a reference table built into the base, was said to be “easier to operate, more rapid, less tiring on the operator's eyes” than the standard model. It was also adapted for operation with either natural or artificial light. It is marked “KLETT BIO / PAT’D APR. 24, 1928 / NO. 1,667,478 / KLETT MFG. CO. INC. / NEW YORK / U.S.A.” The rotating scale at the bottom correlates color with the amount of hemoglobin per 100 cc of whole blood.
Ref.: Robert E. Klett, “Colorimeter,” U.S. Patent 1,667,478 (1928).
Currently not on view
Object Name
blood testing apparatus
date made
after 1928
Klett Manufacturing Company
place made
United States: New York, New York City
overall: 12 1/2 in x 4 in x 6 in; 31.75 cm x 10.16 cm x 15.24 cm
ID Number
catalog number
accession number
catalog number
Credit Line
Gift of Rockefeller Institute through Dr. Detlev W. Bronk, President
See more items in
Medicine and Science: Medicine
Health & Medicine
Data Source
National Museum of American History
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