Improvements in Vignetting Apparatus.
Year: 1897

page_text: Date of Application, 23rd June, 1897-Accepted, 24th July, 1897
COMPLETE SPECIFICATION.
Improvements in Vignetting Apparatus.
We ERNEST ARTHUR HARRIS and EDMUND JAMES EYRES both Citizens of the
Dominion of Canada, residing at Victoria in the County of Victoria, Province of
British Columbia, Canada, do hereby declare the nature of this invention, and in
what manner the same is to be performed; to be particularly described and
ascertained, in and by the following statement :—
This invention relates to vignetting apparatus; and it consists in the nove!
construction and combination of the parts hereinafter fully described and claimed.
In the Drawings: Figure 1 is a side view of the vignetting apparatus. Figure 2 is
a front view of the same.
A is a portion of a photographic camera of any improved construction. B is a
support which is preferably a metallic tube. The support B is secured at one end to
a plate b which is fastened to the camera so that the support is in a substantially
horizontal position. B is a sheave journaled on a pin b1 which is carried by the front
end portion of the support.
C is a sleeve which is slidable longitudinally on the support B, and which is also
freesto oscillate on it.
D is a driving sheave journaled on a pin d projecting from the front of the camera,
The sheave D is provided with a handle for revolving it.
E are two ide sheaves which are journaled on a pin e carried by a bracket el.
The bracket is secured to the plate b. Fisa flexible connection, such as a cord or
chain. The ends of the flexible connection are secured to the sleeve C, and it is
passed over the sheaves B¹, D, and E, as shown in the drawing. The sleeve C is
moved back and forth by means of the flexible connection, when the driving sheave
is revolved.
G is a saddle bracket secured to the sleeve C and provided with laterally projecting
knife edges g.
His a frame which is pivoted on the knife-edges g, and provided with crossbars .
I is a vignetting disc provided with an aperture i. This disc is of any approved
construction, but it preferably consists of two plies of woven wire gauze with an
intervening sheet of paper or similar fabric. The openings through the various plies
of wire gauze and paper are of different size so that the light is cut off gradually
around the common opening i. The disc is provided with a rim i¹ which holds the
plies together.
J is a weight secured to the lower part of the rim, and j'are clips secured to the
upper part of the rim.
K are two spring bars provided with notches k. The lower ends of the bars K are
secured to a plate K¹ with which the clips of the vignetting disc engage. The disc
may be disengaged from the plates as often as desired, and other discs substituted
for it.
The bars K are slidable in holes in the crossbars h and the said holes are wider
than the bars. The resiliency of the spring bars holds the notches k in engagement
with the upper crossbar, but when the bars K are sprung together with the fingers

page_text: they can be raised or lowered so as to bring the vignetting disc into a convenient
position in front of the camera.
The vignetting disc cuts off portions of 'the light so that the background of the
negative is shaded around the picture, and many vignettes can be printed from the
shaded negative, without each having to have special care bestowed upon it to produce
the shaded appearance.
Having now particularly described and¨ascertained the nature of our said
invention, and in what manner the same is to be performed; we declare that what
we claim is
1. In a vignetting apparatus, the combination, with a substantially horizontal
support, of a vignetting disc carried by the said support, and means for sliding the said
disc longitudinally, of the support, substantially as set forth.
2. In a vignetting apparatus, the combination with a substantially horizontal
support, of a vignetting disc carried by the said support, and means for adjusting the
position of the said disc vertically, substantially as set forth.
3. In a vignetting apparatus, the combination, with a substantially horizontal
support, of a sleeve slidable and revoluble on the said support, a vignetting disc
pivotally supported from the said sleeve, a flexible connection attached to the said
sleeve, and sheaves arranged at the opposite ends of the said support and carrying
the said flexible connection, whereby the said disc is slid back and forth, substantially,
as set forth.
4. In a vignetting apparatus, the combination, with a substantially horizontal
support, and a sleeve slidable thereon and provided with laterally projecting knife-
edges; of a frame pivoted on the said knife-edges and provided with crossbars, a
vignetting disc, and a plate supporting the said disc and provided with notched
spring bara slidable in holes in the said crossbars, substantially as set forth.
Latest Red de alune 1907
Hated this rd day of June 1907
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the A
1)