Prosch Manufacturing Co. (New York, NY)
Duplex Shutter - c. 1885-c.1890s
Scovill Mfg. Co. catalog, 1886, p.
Mfg. Co. catalog, 1886, pp.
Duplex No. 1; pneumatic release piston on back
No. 4 Duplex; pneumatic release piston on front; about 4"
No 3 with unmarked rapid rectilinear
Prosch Duplex and
Prosch Triplex do not appear to have
been advertised together - once the Triplex was developed, the Duplex was
The above example is missing the spring on the right side that
somewhat controls the speed.
Illustrated Catalogue of Amateur Photographic Equipments & Materials, E.
& H.T. Anthony & Co.
(New York, NY), September 1885,
Catalogue of Amateur Equipments and Materials, E. & H.T. Anthony & Co. (New
York, NY), September 1886, p. 49
Photographic Bulletin, Vol. 17, No. 18, E. & H.T. Anthony & Co., (New York, NY),
September 25, 1886, p. 13
How to Make Photographs and Descriptive Price List,
Scovill Mfg. Co. (New York, NY), distributed by Andrew J. Smith
(Providence, RI), 1886, p.
Photographic Lenses and How to Select Them, James W. Queen & Co.
(Philadelphia, PA), 1887, p. 30
International Annual of Anthony's Photographic Bulletin, Vol.
W. J. Harrison and A. H. Elliot, eds., E. & H. T. Anthony &
Co. (New York, NY), ads p. 62
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