Signedmarked on triangular plate near top of instrument: BAUSCH / & LOMB / OPTICAL CO. / ROCHESTER N.Y. / U.S.A. [in prism]
Inscribedmarked on rectangular plate neat top of instrument: U.S.A. PATENT / 1,756,283 / SERIAL NO. 26291
Historical AttributesUsed at Harvard Medical School
Primary SourcesBausch & Lomb Optical Company, Microscopes & Accessories (Rochester, NY: Bausch and Lomb Optical Co., 1929), 161.
Bausch & Lomb Optical Co., Catalog D-111: Scientific Instruments (Rochester, NY: Bausch & Lomb Optical Co., 1940), 124.
Provenancetransferred to CHSI from Countway Library, Harvard Medical School, 1971