Washington Teasdale
1880s
Photograph (Cyanotype) of his Harmonograph

Cyanotype
7.2 x 9.6 cm
 
Museum of the History of Science
Gabb Collection, Inventory Number: 60866, Accession Number: 1949-10
 
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).
 
LL/93975