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
Photographic Advice, The Scovill & Adams Co. (New York, NY), undated c.1898, p. 30

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