Prosch Manufacturing Co. (New York, NY)

Duplex Shutter - c. 1885-c.1890s

 

                                                                                Scovill Mfg. Co. catalog, 1886, p. 87                                                                                                Scovill Mfg. Co. catalog, 1886, pp. 87-88

Duplex No. 1; pneumatic release piston on back

No. 4 Duplex; pneumatic release piston on front; about 4" wide

No 3 with unmarked rapid rectilinear


Notes: 

The Prosch Duplex and Prosch Triplex do not appear to have been advertised together - once the Triplex was developed, the Duplex was apparently obsolete.

The above example is missing the spring on the right side that somewhat controls the speed.

References:
Illustrated Catalogue of Amateur Photographic Equipments & Materials, E. & H.T. Anthony & Co. (New York, NY),  September 1885, p. 65
Illustrated Catalogue of Amateur Equipments and Materials, E. & H.T. Anthony & Co. (New York, NY), September 1886, p. 49
Anthony's 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. 87
Photographic Lenses and How to Select Them, James W. Queen & Co. (Philadelphia, PA), 1887, p. 30
The International Annual of Anthony's Photographic Bulletin, Vol. II, 1889, W. J. Harrison and A. H. Elliot, eds., E. & H. T. Anthony & Co. (New York, NY), ads p. 62


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