HOOVER'S COMBINED SHUTTER AND DIAPHRAGM
De Witt C. Hoover, Buffalo, New York 1885-1891
Hoover's
Combined Shutter and Diaphragm, as it's referred to in the patent title and in The Scientific American 1885, or just "The Hoover Shutter" as seen in some advertisements, was designed by De Witt C. Hoover of Buffalo,
New York, with Patent No. 317,788 granted to him on May 12, 1885. Like Benster's Patent Diaphragm Shutter of
the same era, Hoover's shutter was fitted to a lens of the photographer's
choice:
Source:
U.S. Patent and Trademark Office
As reported in The
Scientific American Supplement, Volume XX, No. 500, August 1, 1885, Hoover's
shutter was exhibited at a recent convention of photographers in Buffalo, New
York. The magazine went on to describe its construction and operation: "It consisted of having two light thin
strips of gutta-percha pass in slits through the lens tube in the place usually
occupied by the diaphragm. The principle of the movement was "go and return,"
and the strips were operated by a toggle joint and a coiled watchspring.
Diamond shaped openings were made in the strips, and the size of the diaphragm
was regulated according(ly) as the strips were drawn apart or closed together.
The whole was neatly encased in a gutta-percha box. It possessed the advantage
of allowing the operator to make a time or an instantaneous exposure at will
with any size diaphragm he might desire to use. It also tended to make pictures
taken instantaneously, much sharper and more distinct than is usually the case.
When the spring was placed at its highest tension it was estimated an exposure
of the mere fraction of a second could be made. Another feature of the
invention was the absence of any jar."
Hoover's Combined Shutter and Diaphragm stands out among
other shutters of the period, having been constructed largely of a
thermoplastic material. Although gutta-percha
was used, most of us would probably describe it as being Bakelite, which wasn't
actually developed until 1907. Hoover's
shutter was also available in a stereoscopic version.
Little is known of De Witt C. Hoover, and it is assumed
that he was the manufacturer. W.H. Walmsley & Company of Philadelphia marketed
the Hoover, but it is not known whether they were involved in its
manufacture. Hoover died in September,
1897 and his passing was noted in the American
Amateur Photographer, Volume IX, No. 12, December, 1897, with an
obituary by his nephew, C. Elmer E. Hoover of Buffalo, New York, stating that
Hoover died suddenly after being stricken with Apoplexy while on his private
yacht, Vixen, during a pleasure trip to Cayuga Island in the Niagara
River. At the time, he was about to
complete a new film for the Kinetoscope, and to make public his discoveries in
porcelain. Per his nephew, Hoover
invented all the machinery used in his photographic paper factory. This is
evidenced by patents held by Hoover for a photographic printing machine (Patent
No. 462,382) and an improved package for photographic plates (Patent No. 402,827).
This example has casing measurements of 3-1/16" x 6"
x 13/16" thick. The lens with a 2-1/2" barrel diameter is unmarked as
to maker. "D.W.C. Hoover's Patent
May 12th 1885" is found molded into the casing:
Hoover's
Combined Shutter and Diaphragm was still being advertised by
the photographic supply firm of Tucker & Butts as late as 1891, as seen in The International Annual of Anthony's
Photographic Bulletin for that year.
Very few examples exist today, and the shutter can be
considered rare.
From W.H. Walmsley & Co.'s Illustrated
Catalogue of Photographic Cameras, Lenses, September 1, 1886
Front cover of W.H. Walmsley &
Co.'s Illustrated Catalogue of Photographic Cameras, Lenses, September 1, 1886
Back cover of W.H. Walmsley &
Co.'s Illustrated Catalogue of Photographic Cameras, Lenses, September 1, 1886
From The International Annual of
Anthony's Photographic Bulletin for 1891
Front cover of The International
Annual of Anthony's Photographic Bulletin for 1891