THE
STEREOSCOPIC SHUTTER
Bausch
& Lomb Optical Company, Rochester, New York 1893 - 1902
Henry Clay Stereoscopic Camera
Bausch & Lomb's Stereoscopic
Shutter is seen as early as 1893 in Rochester Camera Manufacturing
Company's May, 1893 Photographic
Apparatus catalogue, offered on the Rochester 5x7 Folding's Stereoscopic version:
From Rochester Camera Manufacturing
Company's May, 1893 Photographic Apparatus catalogue
Reference to the Stereoscopic Shutter is also seen in
Bausch & Lomb's Catalogue of
Photographic Lenses, Shutters, Prisms for June,1894, as well as in The Kodak Manual for the No. 5 Folding
Kodak, also dated June,1894.
The Stereoscopic Shutter is often incorrectly referred to
by collectors as a "Stereo Iris Diaphragm", no doubt due to the use
of the same speed dial, valves and external linkage found on Bausch &
Lomb's Iris Diaphragm. Even an advertisement for the Stereo Montauk in
Gennert's 1900 catalogue mistakenly referred to it as a "Bausch & Lomb
Diaphragm Shutter".
However, the Iris Diaphragm's 8-pivoted blade integrated
shutter and iris configuration, had now been replaced with a 2-blade shutter
and an independent iris control on the Stereoscopic. Per Bausch & Lomb's June,1894 catalogue,
the shutter blades were available in at least two forms: A
- blades with a diamond shape forming a square opening, and B - blades that opened with a
horizontal parallel opening over the entire diameter. Unless specified, form A was standard. The
shutter had a capability of speeds between 1/100th of a second and three
seconds, and could be released manually or pneumatically with a bulb.
There were two versions of the shutter, which I've
designated as the Original Model and
the Improved Model. The Original Model from 1893-1900 was
equipped with separate wheel stops for each lens, each requiring individual
adjustment.
By 1900, an engraving for the Ray Stereo Camera and an
engraving for the Stereoscopic Premo in the Sweet, Wallach & Company catalogue
for 1901, are both shown equipped with the Improved Model Stereoscopic. This Improved Model now had apertures that were
linked through a single sliding lever on the shutter's face, permitting both to
be adjusted simultaneously. If
engravings are any indicator, the changeover occurred about 1900, and by 1902
the Stereoscopic seems to make its last appearance in camera manufacturer and
photographic supplier catalogues. However, as has been experienced with some cameras
and shutters of the 1890's, engravings were not always updated. As such, the
transition to the single lever aperture control may have occurred prior to
1900.
At least three patterned finishes are known, and there
are probably variations, even to these.
The three basic patterns are: engine-turned,
mottled and scarified-line:
Improved Model Stereoscopic with engine-turned
pattern
Improved Model Stereoscopic with mottled pattern
Original Model Stereoscopic
with scarified-line pattern
Improved Model Stereoscopic with scarified-line
pattern
All three patterns have been found on the Improved Model,
and the scarified-line has been seen on the Original Model, at least. The scarified-line pattern seems most similar
to the engraving in Bauch & Lomb's 1894 catalogue, and based on the
majority of Original Models I've seen, this pattern seems to dominate. Conceivably, aluminum versions of the
Stereoscopic could exist, since Bausch & Lomb's Iris Diaphragm had been
produced in aluminum as early as 1893.
Serial numbers on the earliest versions appear as an engraving
on the face (No.'s 52 and 92 have been seen on EBay, engraved in this fashion),
whereas later versions contain the serial number on a separate plate affixed to
the front. The Stereoscopic was offered as standard equipment on the Henry Clay
Stereoscopic models of 1898-1899, the Stereo Montauk of 1900, and can be found
on other stereo cameras of the mid-to-late 1890's.
Coveted by collectors, the Stereoscopic is truly one of Bausch & Lomb's most beautiful and
enduring products.
From Scovill's
The American Annual of Photography and Photographic Times Almanac for 1899