PROSCH
TRIPLEX STEREOSCOPIC
Prosch
Manufacturing Company, New York
1890-1901
Prosch's Triplex Stereoscopic is seen as early as 1890 in
Scovill's How to Make Photographs,
March,1890. As stated in the advertisement, "It consists of two
Triplex Shutters on one frame, operated by one lever and one release, and
consequently gives two identical exposures."
The Triplex Stereoscopic was preceded by the stereo
version of Prosch's Duplex, called the Duplex Stethoscopic Shutter in Scovill's How to Make Photographs for
September, 1888, January, 1889 and
March, 1889. The "Duplex Stereoscopic" is also listed in the W.D. Gatchel Catalogue, 1888.
The Duplex Detective Shutter, offered in 1888 and 1889, was essentially the
Duplex Stethoscopic (or Stereoscopic) configured for use in a detective camera.
It was fitted by Prosch when the customer sent in their box and lens with an
order. By March,1890, both the Duplex
Stethoscopic and Duplex Detective Shutters were no longer offered, but the
Duplex mono version was still available.
By January,1892, the Triplex Stereoscopic made its
appearance on the Henry Clay Stereoscopic Hand Camera as standard
equipment. By 1893, it was available in
eleven sizes, with lens openings ranging from 3/4" to 2-1/2". Prosch's advertisement in Scovill's Almanac for 1894,
referred to it as the "Triplex Stereo".
As some of the examples show below, several different design
patterns have been seen: cross-hatched lines, horizontal lines, engine-turned
swirls, scarified-lines, or some combination or variant of these patterns. By 1894, Prosch was offering to construct
shutters in either brass or aluminum, and aluminum versions of the Triplex and
Columbian Triplex are known to exist.
Aluminum Triplex Stereos may also exist, although I have never seen one.
Triplex Stereo's are typically marked "Triplex,
Prosch M'F'G' Co., Makers, N.Y., Pat. Nov. 2d 1886" on the shutter's
faceplate at center. However, the
manufacturer's name and patent can sometimes be found, outboard of the lens at
one end along with the serial number.
Sometimes, the patent will be found at top center above the linkage
arm. Most examples are found with serial
numbers, but not all, and they have been seen in various areas of the
faceplate. Aside from the Henry Clay
Stereoscopic, the Triplex Stereo could be purchased separately and can be found
on various field and self-casing cameras of the 1890's. It was being offered
until at least 1901, in the Andrew
J. Lloyd & Company Photographic Encyclopedia, available in four sizes.
Many collectors consider Prosch Triplex and Duplex
shutters to be quite common, when in truth compared to Bausch & Lomb
Unicums and Iris Diaphragms, relatively few come to market. Prosch shutters are in demand by collectors,
simply for their scarcity and their outright beauty. The Triplex Stereoscopic can be considered
rather rare, as they are seen very infrequently today.
Other
Triplex Stereos with different finish patterns and lens configurations: