Improvements in Photographic Cameras.
Year: 1898

page_text: Date of Application, 27th Oct., 1898
Complete Specification Left, 26th July, 1893 -Accepted, 27th Oct.,, 1899
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PROVISIONAL SPECIFICATION..
Improvements in Photographic Cameras.
I, THOMAS RUDOLPHUS DALLMEYER, of 25, Newman Street, Oxford Street, in the
County of Middlesex, Optician, do hereby declare the nature of this invention to
be as follows:-
:―
This invention relates to cameras for successively taking a number of similar
views such as are used in colour photography.
For this purpose I employ a moveable mirror or mirrors for successively
diverting the beam of light fom the lens to a number of sensitive plates.
According to one arrangement I employ a mirror fixed at an angle of 450 to a
shaft co-axial with the lens so that by turning the shaft the image is successively
directed on to plates at the sides of the camera.
In some cases it is desirable to obtain a single direct image and two reversed
images. For this purpose I employ a pair of mirrors free to turn on axes parallel
to each other and at right angles to the axis of the lens. When these mirrors are
turned parallel to the axis of the lens the light passes between them onto a plate
at the back of the camera giving a direct image but when one of the mirrors is
turned through an angle of 45° it diverts the light onto a plate at the side of the
camera giving a reversed image. Or the same result may be obtained by a single
central mirror with the axis of the lens lying in its plane and which can be
turned through an angle of 45° to either side.
In all cases the mirror or mirrors can be placed either behind the lens or
between the front and back combinations forming it, in the latter case there being
as many suitably placed back combinations as there are plates.
Dated this 26th day of October 1898.
THOMAS R. DALLMEYER.
Improvements in Photographic Cameras.
I, THOMAS RUDolpius DallmeyER, of 25, Newman Street, Oxford Street, in the
County of Middlesex, Optician, 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 cameras for successively taking a number of similar
views such as are used in colour photography.
For this purpose I employ a moveable mirror for successively diverting the
beam of light from the lens to a number of sensitive plates.
[Price 8d.1

page_text: I employ a mirror fixed at an angle of 45° to a shaft co-axial with the lens so
that by turning the shaft the image is successively directed on to plates at the
sides of the camera.
Figure 1 is a back elevation, and Figure 2 a longitudinal section of the
apparatus.
Figure 3 is a longitudinal section of a modification.
In Figures 1 and 2 a are the walls of the cameras, a¹ is a tube fixed to the
camera and which carries the lens. bare four plate holders sliding in grooves
in the ordinary manner but placed at the four sides of the camera instead of at
the back as is usual. c is a frame the front of which revolves on the ring of
balls & surrounding the tube a¹ and the back carries the shaft e which revolves in
the ball bearing f. g is a mirror fixed to the frame c. h is a spring having one
end fixed to the shaft e and the other to the camera. j is a four toothed ratchet
or cam wheel fixed to the shaft e and k is a bolt engaging with it. is a flexible
ball placed between a lug a² on the camera and a lug on a lever operating
the bolt k. The ball 7 is connected by the tube m to a second flexible ball n. By
squeezing the latter the ball is expanded, the bolt is withdrawn and the
frame c and mirror g are revolved through a quadrant by the spring / and are
then again arrested by the bolt & engaging with the next tooth of the ratchet wheel j.
This forms a very convenient arrangement for manipulating the mirror but any
other suitable device may be employed.
In Figure 3 the frame c is dispensed with the mirror g being fixed to the tube a¹
which in this case is free to revolve in the ball bearing m and constitutes a hollow
shaft carrying the mirror.
By this arrangement a smaller mirror is required. In this figure the means for
rotating the mirror are not shown, they may be the same as in Figures 1 and 2.
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. In a camera, the combination of a mirror, free to revolve about the axial
line of the lens tube, and making an angle of 45° to it, with plate holders at the
sides of the camera.
2. Photographic cameras substantially as described and illustrated in the
drawings.
1
101 1
B T 1
1000