Bausch & Lomb Optical Co. (Rochester, NY)

 

Unicum Shutter - c. 1898 - c. 1920's

 

 

Bausch & Lomb Optical Co. Catalog (Rochester, NY), 1898, p. 55


Notes:  This shutter uses the speed dial as the cocking mechanism, just like the Iris Diaphragm Shutter, but the iris operates independently, allowing for a quicker open and closing of the shutter mechanism.

References:
Bausch & Lomb Optical Co. Photographic Objectives, Shutters and Accessories, Bausch & Lomb Optical Co. (Rochester, NY), 1898, pp. 55-56
Catalogue "G" 1898 Photographic Apparatus and Materials, Montgomery Ward & Co. (Chicago, IL), p.34
Department 5, Photographic Supplies, Lenses, etc., Andrew J. Lloyd & Co. (Boston, MA), undated c.1898, p.40

Photographic Advice, The Scovill & Adams Co. (New York, NY), undated c.1898, p. 30
Photography has Made the Sun an Artist, Andrew J. Lloyd (Boston, MA) catalog, 1899, pp.56-57
Premo Cameras, Rochester Optical Co. (Rochester, NY, dated 1907, p. 53

 

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