An Apparatus for the Production of Stereoscopic Photographs with a Single Lens Camera at One Exposure.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
t
An Apparatus for the Production of Stereoscopic Photographs with
a Single Lens Camera at One Exposure.
1
THEODORE BROWN Portland House Fisherton Salisbury Engraver. And I do
hereby declare the nature of this invention to be as follows:-
-
This invention relates to an apparatus the function of which is to reflect to one
lens the two views of one object as seen from the optical angle, so that a double
photograph which is stereoscopic, may be taken on one plate at one exposure.
The means by which I propose to carry out the said objects of my present
invention are as follows.-I construct a framework into the centre of which I fix a
mirror in a perpendicular position having two reflecting surfaces at such an angle
as to receive the reflected views from two other mirrors also in a perpendicular
position, which are placed at the optical angle of vision, at a short distance from
the said céntre mirror.
The said mirrors at the optical angle are hinged perpendicularly to the framework
in such a manner as to allow them to be adjusted to the different optical angle when
looking at a distant or near object.
To effect the object of my present invention, the said mirrors at the optical
angle are directed towards the object to be photographed, and the said centre
mirror facing towards the lens of the camera so that both views of the object as
seen from the optical angle are reflected unto the screen of the camera, the plate is
then inserted and the exposure made in the ordinary way.
Dated this 6th day of November 1894. .
THEODORE BROWN.
An Apparatus for the Production of Stereoscopic Photographs with
a Single Lens Camera at One Exposure.
I, THEODORE BROWN of Portland House Fisherton Salisbury in the County of
Wiltshire Photographic Dealer 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 an apparatus the function of which is to reflect to one
lens the two views of one object as seen from the optical angle, so that these two
views may be projected side by side on one and the same photographic plate thus
producing a stereoscopic view.
Reference being made to the annexed drawing
Fig. 1 shows in plan a diagram illustrating the essential parts of the said
apparatus, namely the reflecting mirrors, and the method of their employment.
Fig. 2 is a plan view of the complete apparatus in open position ready for use,
Fig. 3 shows the same in plan closed.
Fig. 4 is a side view closed.
Fig. 5 is a cross section on line 5-5 Fig. 6, and
Fig. 6 is a view from the front of the apparatus Figs. 5 and 6 being on a smaller

page_text: The apparatus comprises a framework usually made to fold into a small space
and so contrived that when open or extended it carries in the centre a mirror a in
a perpendicular position having two reflecting surfaces a¹ ahat such an angle as to
respectively receive the reflected views from two other mirrors bb also in a
perpendicular position which are placed at the optical angle of vision at a short
distance from the said centre mirror. The said mirrors b are so hinged or pivoted
perpendicularly to the framework that they can be adjusted to the different angles
required for the photographing of a distant or a near object.
To effect the object of the present invention the said mirrors bb are directed
towards the object to be photographed as shown at A. B. in the diagram Fig. 1 and
the said centre mirror a with its apex towards the lens of the camera as shown
at' C, the plate is then inserted in the camera D and the exposure made in the
ordinary way.
.
F
.. * 1
The accompanying drawing shows more particularly the construction of the
frame for affixing the mirrors to an ordinary field camera. The mirror a is made
in two parts to fold together and is fitted in the frames a' a' connected by the
pivoted bars as a screwed to the frames.. These frames are made with three sides
only, in order to permit the mirrors to meet exactly at their apex as shown in
Fig. 5. A strip of black cloth or the like may be let in flush across the meeting
line of the mirror frames a a² at a'. The mirrors bare also placed. in frames
into which they may be inserted from the back, the panel being loose and held in
place by turn buttous . The frames and a² are connected by the crossed bars c c
pivoted together at c', and by the bars 2 pivoted to the frames a* atic and to the
frames bate. These bars form a parallel extension movement. For the
adjustment of the angle of mirrors the connections at c may be set screws
engaging in slots c in the bars c². If however no adjustment is required there may
be ordinary pivots here. At the connecting cross point of the bars c or at any
other suitable place there are fitted suitable bars such as d d, of straight; triangular,
Yashaped or any other form for affixing the device to the camera front or to the
base board or otherwise in front of the lens of the camera. These bars may engage
in sockets such as d¹ fixed suitably to the camera.. Thumb nuts fix the bars d
to the pivotal screw c' of the bars c, which screw may be passed through any one
of the holes d' of the bars d according to the distance of the apparatus from the
front of the camera. Another means may however be used to affix the apparatus
to the camera according to the construction of the latter.
For detective or hand cameras the device may be fitted into an extension of the
front of, the camera or casing and in such case the mirrors bb may be fixtures
while the mirror a may be made in one or two parts to move aside from in front of
the lens or in any other way to be removed or inserted so that it may be before the
lens when required or out of the field of the latter when an ordinary photograph
not of a stereoscopic nature is to be made.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that:whatal
claim is;
' ז'
'
The construction of apparatus comprising the mirrors a and b adapted to be
set with regard to one another and to be supported in front of the lens of a camera
for the projection of a stereoscopic or double view through one and the same lens
in, the manner herein described and illustrated:..
:
2. The construction of mirrors with the frame for holding them and means for
fixing the same, as herein before described:
.il .
خصصة
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, WC, Agents to
Applicant.