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Washington Teasdale
Photograph (Cyanotype) of his Harmonograph
1880s
Cyanotype
7.2 x 9.6 cm
Museum of the History of Science
Gabb Collection, Inventory Number: 60866, Accession Number: 1949-10
LL/93975
Cyanotype (blueprint) positive; very dark blue. The harmonograph (geometric curve drawing apparatus) made by the photographer, Teasdale, and related equipment. See also the photograph of him using it (54814).
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