Improvements in View Finders for Twin Lens or Divided Cameras."
Year: 1897

page_text: Date of Application, 5th Feb., 1897
Complete Specification Left, 2nd Nov., 1897-Accepted, 4th Dec., 1897
PROVISIONAL SPECIFICATION.
"Improvements in View Finders for Twin Lens or Divided
Cameras."
I, WILLIAM STANBURY, of 12 Charterhouse Street, E.C., in the City of London,
Wholesale Optician, do hereby declare the nature of this invention to be as
follows:-
My invention consists of an improved view finder for use in photographic
cameras particularly those known as twin lers or divided cameras.
The camera I form as a rectangular box divided into two chambers. To the
front of the lower chamber I attach a lens for the purpose of taking the picture.
To the front of the upper chamber I attach a second lens to act as the finder.
In two of the sides of the upper chamber adjacent to the front and adjacent to
each other I cut suitably sized openings, and I fit into or over such openings
finely ground plates of glass commonly known as focussing screens.
At or near
the edge of each of such openings, which is most remote from the lens, I hinge a
reflecting mirror which can be allowed to fall to any suitable angle, the object of
this mirror is to receive the image projected by the upper lens and to throw it
upon the ground glass screen to which it is attached.
To the lower edge of such mirror I attach a cord or cords which pass through..
the top of the box and allow the mirror to be drawn up so that it lies parallel to
the round glass, or I may use slotted or jointed levers to raise the mirrors, and
such levers, cords, or other lifting devices may be attached to folding hoods or
focussing chambers which cover the aforesaid ground glass screens so that the act
of unfolding one or other of the hoods lowers into position the mirror attached
thereto, or instead of the hinged mirrors as herein describad I may use a single
mirror carried by an axis in such a way that it may be turned to receive and pro-
ject the image formed by the lens upon either of the ground glass screens at will,
the axis of the mirror may either turn in a plain bearing or may move with a
spiral motion so as to allow the ground glass screens to be placed in a more con-
venient position.
By the use of one or other of the focussing screens and mirrors, pictures may ba
taken when holding the camera in a vertical or horizontal position.
Dated this 4th day of February 1897.
*
Improvements in View Finders for Twin Lens or Divided
Cameras."
I, WILLIAM STANBURY, of 12 Charterhouse Street, in the City of London,
Wholesale Optician, do hereby declare the nature of this invention and in what
[Price 8d.]

page_text: manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
My invention consists of an improved view finder for use in photographic
cameras particularly those known as twin lens or divided cameras.
The drawings hereunto annexed shew so much of such a camera as will enable
me to describe this invention.
Figure 1 is a side elevation, Figure 2 is a plan, Figure 3 is a part transverse
section and Figure 4 is a similar section with some of the parts in a different
positon.
In this description I shall speak of the camera as being held in a vertical position
although it may be held in a horizontal position and will work equally well.
The camera I form as a rectangular box divided into two chambers a and b to
the front of the lower chamber a I attach a lens for the purpose of taking the
picture.
To the front of the upper chamber b I attach a second lens to act as the finder.
In two of the sides of the upper chamber 6 adjacent to the front and at right:
angles to each other I form suitably sized openings cell and I fit into such openings
finely ground plates of glass or celluloid dd-these form what are commonly
known as focussing screens. At or near the edge of each of the openings cc¹
which is furthest from the lens I hinge reflecting mirrors e c¹ which can be allowed
to fall to any suitable angle, in order to project the image formed by the upper¨
lens on to the screen. When the camera is not in use I cover each of the focussing
screens with doors ffl and so arrange that when one of these doors is opened
the mirror in connection therewith shall fall into a suitable position for use and
that when the door is closed the mirror shall be moved into a position parallel to
the screen and out of the way of the second mirror should it be required to use it.
This I do in the following manner.
The door when closed rests on the head of a pusher g g the lower end of which
rests on a finger hh projecting from the back edge of the mirror-thus by closing
the door the mirror is held up in the required position as shewn and may be there
secured upon opening the door the mirror falls automatically into the required."
position for work at the same time raising the pusher into position to be acted:
upon when the door is again closed. In place of the above arrangement the',
mirror might be raised and lowered by cords or any other suitable device.
Figure 3 the camera is shewn closed and with the mirror raised. In Figure 4 the
camera is shown in use with the door open and the mirror lowered.
In
When holding the camera in a horizontal position the operations will be exactly
the same except that the door f screen and mirror el will be used in place of fil
and e the arrangement being such that it is impossible for the parts to conflict.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is.
:
1. The combination in a twin lens or divided camera of two focussing screens
and two mirrors at right angles to each other-one focussing screen and one
mirror being used when the camera is held in a vertical position the other focussing
screen and mirror being used when the camera is held in a horizontal position.
2. The combination in a twin lens or divided camera of two hinged mirrors at
right angles to each other either the one or the other falling automatically into
position when required for use accortling to the position in which the camera is
held.
3. Twin lens or divided cameras substantially as shewn and described.
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