THE COURSEN SHUTTER
The Scientific Lens Company, 708 East
166th Street, New York (attributed) 1904-190?
The
Coursen Shutter was designed by George L. Coursen of Newark,
New Jersey.
Taken from the patent's wording, the design permitted the
shutter's leaves to "be moved in reversed directions across the opening
for exposure, in succession at each compression of the bulb, thus being able at
each time and during each reverse movement of the leaves in either direction
across the opening in the frame of the shutter to take a picture, and that
without the further use of an additional
bulb for releasing the mechanism to produce such reverse movement of the leaves
of the shutter, and, furthermore ,dispensing with the use of an additional
regulating lever or levers for producing a time or instantaneous exposure and
also dispensing with the use of other independently-operating parts of
mechanism now ordinarily employed for producing the results desired."
Coursen was granted at least five photographic patents,
three relating to shutters: Patent No.
718,983 granted January 27, 1903, Patent No. 946,657 granted January 18, 1910
and Patent No. 2,002,109 granted May 21, 1935.
With this shutter citing the 1903 patent date and other patents pending,
this suggests that it was manufactured after January 27, 1903.
This holds true as the Coursen Shutter, along with the Scientific
Lens Company's "Ocular" Portrait Lens was announced in the June, 1904
issue of Camera Craft, A Photographic Monthly, Volume VIII. An ad for the Coursen Shutter and the
"Ocular" appeared the following month in Camera Craft's July, 1904
issue. Having a 1/300th of a second
speed capability and equipped with a Scientific Double Anastigmat lens composed
of 8 lenses made by Jena Glass, the shutter was marketed by the Scientific Lens
Company, 708 East 166th Street, New York:
Advertisement for the Coursen
Shutter and the "Ocular" Portrait Lens from Camera Craft monthly for
July, 1904
Source: U.S. Patent and Trademark Office
Source: U.S. Patent and Trademark Office
Source: U.S. Patent and Trademark Office
With the shutter being sold in 1904 by the
Scientific Lens Company, and the second patent having been assigned to
Wollensak in 1910, its manufacturer is attributed to the Scientific Lens
Company for now, pending more information.
Having a beautiful lacquered engine-turned
pattern, the shutter is very substantial weighing in at 1-1/2 pounds. It measures
4" wide (including speed regulator), 3-5/8" in height and 2-1/2"
front to back. The nameplate at top reads
"The Coursen Shutter, Pat. Jan. 27, 1903, Other Pats. P D G.".
The speed regulator is mounted, so as to
be movable from the 1 o'clock position to the 4 o'clock position. Again, more review is needed to explain this
feature which controls some aspect of the blades. Complicated patent language along with this
example being inoperative, has made an accurate assessment of its operation
difficult. The shutter appears to mount via the lens shroud at rear, retaining
it in lieu of a threaded flange. Other than the nameplate, there are no
markings or identification on the shutter, lenses or shroud.
The last shutter patent, applied for in 1934 and granted
in 1935, and which details the speed dial and housing in the patent drawing as
shown on this example, would suggest that the shutter was built closer to that period.
However, shutters of this style having brass finishes and external pneumatic valves
(for either release or to regulate speed), were all but gone from the
marketplace by 1916/1917. Even Wollensak
Optical's catalogue for 1916/1917 doesn't feature any shutters with external
valves, and 1917 is a long way away from 1935.
Yet, here is this shutter advertised in 1904 with a
1/300th speed, that was no doubt enabled by this speed regulator unit.
As to George L. Coursen, other than his patents, little
has been found regarding him or his connection to the Scientific Lens Company
or to Wollensak Optical. The last patent
granted to Coursen in 1935 was assigned in one-half to H. Theodore Sorg of
Newark, New Jersey. Harrison Theodore Sorg (1888-1955) is believed to have been
an attorney (possibly Coursen's attorney and/or business partner?) and an alumni
of Wheaton College.
Research so far indicates the Coursen Shutter was short-lived, few references have been found and
it's the only example I've ever seen. Among
early 20th Century American shutters, it can be considered rare.