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
