Year: 1887

page_text: zna. 10 expeante focussing
3rd. To enable the front to be fixed at any angle to the base board, and.
4th. To facilitate the fixing of the rising front at any required distance from the
focussing screen.
1 carry out the first of the said objects by attaching the bellows of the camera to
the front and allowing the front to slide up and down a slotted frame provided for its
support.
.
The second of my objects is carried out by attaching the front to its supporting
frame, which in its turn is attached to sliding pieces and allowing the supporting
frame to slide backwards and forwards in a carrying frame which has a rack and
pinion movement attached to its underside thus giving, by means of the rack and
pinion action a to and fro movement to the front.
The third object is of a two fold nature, and is carried out by (a), centring the
supporting frame into the sliding pieces: thus allowing the supporting frame to
rotate. (b), Attaching to the sliding pieces, and at a distance from the centre a
slotted strip by means of a pin; the said slotted strip extending upwards past the side
of the supporting frame. A milled headed screw is attached to the side of the
supporting frame and slides in the slotted strip. By means of this Milled headed
screw and slotted strip the front may be held firmly in any desired position.
The fourth of my objects is carried out by attaching to the side of the sliding piece
a block on the under-side of which is an inclined plane. The fulcrum of a lever is
also attached to the side of the sliding piece and on the side of this lever is another
inclined plane.
.
1 1007

page_text: The objects of my Invention are:-
(I) To facilitate the raising and lowering of the rising-front of a photographic
camera;
..(II) To expedite the focussing;
(III) To enable the rising-front to be fixed at any desired angle of inclination with
the base board;
And (IV) To fix the rising-front at any required distance from the focussing
screen.
I will now proceed to describe my invention with reference to the accompanying
drawings, in which similar letters denote corresponding parts in all the figures.
Fig. 1 is a side elevation of the camera frame and its attachments; Fig. 2 is a
front elevation of the same; and Fig. 3 is a plan of the lever and block, A and B,
shewn in Figs. 1 and 2.
The rising-front F consists of a movable panel enclosed in a rectangular frame
which is supported by an outer frame H H. The said outer frame, H.H, is provided
with slotted plates GG, through which milled set-screws work into nuts let into the
framework of the rising-front F.
The outer frame, H H, is pivotted on pins, J J, so that it can rotate in a vertical
plane. Each of these pins passes through a plate K which is bent at right angles at
its lower extremity so as to slide under the horizontal plate L attached to the upper
part of the carrying frame E.
Attached to the bent plate K, is a block B, whose under surface is inclined towards
the horizontal plane in such a way that its thinnest edge is next the bent plate K.
(See Fig. 2). On the under surface of this block B, a lever A is pivotted, the upper
surface of said lever being equally inclined to that of the block, but in the opposite
direction, so that they fit one under the other. If now the lever be moved horizontally
into the position A¹ (Fig. 3.) the thick edge of the said lever will be brought under the
thick edge of the block, and the horizontal plate L will be pressed down on the bent
plate K, and will be rigidly held in position.
On the front edge of each of the bent plates K K a strut M is pivotted, and
provided with a milled set-screw which passes through a longitudinal slot in the said

page_text: strut, and works into a nut in the upright outer frame H H, holding it at any desired
angle of inclination from the perpendicular. The back of the camera is provided
with a similar strut N which holds it at any desired angle of inclination from the
perpendicular.
The base frame C is fitted with a pinion D D gearing into racks attached to the
underside of the carrying frame E, so that the rising-front and its attachments can be
moved backward and forward as desired.
Having now particularly described and ascertained the nature of my invention, and
in what manner the same is to be performed, I declare that what I claim is :-
The combination of an inclined block and lever with a camera front, substantially as,
and for the purpose, specified, and illustrated.