Improvements in Cameras for Making Lantern Slides or Copying.
Year: 1889

page_text: Date of Application, 14th May, 1889
Complete Specification Left, 14th Feb., 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Cameras for Making Lantern Slides or Copying.
Photographic Pictures.
WALTER GRIFFITHS Highgate Square Mosely Road Birmingham Manufacturer, do
hereby declare the nature of this invention to be as follows:-
--
. My invention consists in a new & moré convenient arrangement for holding
photographic negatives or positives-lenses & sensitive plates for the production of
lantern slides, transparencies, or other copies of the aforesaid photographic negatives
or positives in such a way that the instrument. is always ready fixed as regards
the required size, the required position & the required focus of the said photographic
picture & without the necessity of any preparing whatever, as distinguished from
the ordinary methods & necessities in producing lantern slides & transparencies.
I carry out my invention as follows,
The focus of the lens to be used having been discovered or determined, I
prepare a tube, preferably square, & of the length to suit the said focus.
This tube may be of any suitable material, such as wood, metal, mill-board or straw-
board &c., or a combination of these materials-as an instance I use wood,
strawboard & cloth combined.
Into one end of this tube, which I will call the "front" I fix a grooved frame,
into which to slide the photographic negative or other plate, & which is thereby held
in the required position.
These grooves are made to fit any one size of plate, such as the standard
photographic sizes-64×4 inch-8 × 6inch &c.
Immediately in front of this groove I place, if required, a second groove, into
which may be inserted a ground glass, for the better diffusion of the light passing
through the negative or photographic plate-this being often desirable.
At the opposite end of the tube, or at any required distance up it, I fix a
frame with an aperture in the centre, in which aperture is to be placed the sen-
sitive plate, before mentioned-& which may be held in position by a spring, or
any of the usual devices.
Between these arrangements at each end I insert a third frame in the aforesaid
tube this third frame carrying the lens, which is to project the picture upon. the
sensitive plate mentioned & placed in the aperture mentioned.
I provide a double cap or lid, which fits over what I call the back end of the
tube its function being to protect the aforesaid sensitive plate from all light except
that passing through the lens mentioned, & which light contains the image from
the negative or photographic plate situated in the grooves at the front end of the
tube.
Small handles or such like, may be placed on the lid or cap, or other parts for
convenience in handling.
I complete the apparatus ready for use by setting the afore mentioned frames
in such relative positions that an image of the negative or photographic plate is
projected upon any sensitive plate in the back end of the tube, with all the requisite
sharpness of focus, & correct size & position, that once being fixed all further setting
may be dispensed with, & the instrument rendered always ready for immediate use.
Dated this 13th day of May 1889.

page_text: COMPLETE SPECIFICATION.
Improvements in Cameras for Making Lantern Slides or Copying
Photographic Pictures.
I, WALTER GRIFFITHS Highgate Square Mosely Road Birmingham in the County
of Warwick Manufacturer 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 :-
My invention consists of a new and more convenient arrangement for holding
photographic negatives or positives lenses and sensitive plates for the production
of lantern slides transparencies or other copies of the aforesaid photographic
negatives or positives in such a way that the instrument is always ready fixed as
regards the required size & the required position and the required focus of the
said photographic picture & without the necessity of any preparation whatever as
distinguished from the ordinary method and neccessities in producing lantern
slides & transparencies.
I carry out my invention as follows:-
The focus of the lens to be used having been discovered or determined I prepare a
tube preferably square & of the length to suit the said focus.
-
This tube may be of any suitable material such as wood, metal mill-board or
straw-board &c. or a combination of these materials as for instance I use wood
strawboard & cloth combined.
Into one end of this tube which I will call the "front" I fix a grooved frame in
which I slide the photographic negative or other plate & which is thereby held in the
required position."
These grooves are made to fit any one size of plate such as the standard photographic
sizes 6x43 inch-8 x 6 inch etc.
Immediately in front of this groove 1 place if required a second groove, into
which may be inserted a ground glass for the better diffusion of the light passing
through the negative or photographic plate-this being often desirable. At the
opposite end of the tube or at any required distance up it I fix a frame with an
aperture in the centre in which aperture is to be placed the sensitive plate before
mentioned & which may be held in position by a spring or any of the usual devices.
Between these arrangements at each end I insert a third frame in the aforesaid
tube this third frame carrying the lens which is to project the picture upon the
sensitive plate mentioned & placed in the aperture mentioned.
I provide a double cap or lid which fits over what I call the back end of the
tube its function being to protect the aforesaid sensitive plate from all light except
that passing thro the lens mentioned & which light contains the image from the
negative or photographic plate situated in the grooves at the front end of the tube.
Small handles or such like may be placed on the lid or cap or other parts for convenience
in handling.
I complete the apparatus ready for use by setting the aforementioned frames in
such relative positions that an image of the negative or photographic plate is projected
upon any sensitive plate in the back end of the tube which possesses all the requisite
sharpness of focus & correct size & position that once being fixed all further setting
may be dispensed with & the instrument rendered always ready for immediate use.
In order that my invention may be clearly understood & more easily carried
into practice I have appended hereunto a sheet of drawings upon which I have fully
illustrated the nature of the said invention.
Figure 1, is a general view of my improved reducing camera.
Figure 2, is a longitudinal vertical section through same.
Figure 3, is an elevation of the front end of the camera.
Figure 4, is an elevation of the rear end of the camera with the double cap
or lid removed so as to shew the aperture B for the sensitive plate D and the
lens E.

page_text: In carrying my invention into effect 1 form the body or tube A preferably of
a square or oblong section & of a length to enable the required focus to be obtained.
This body or tube A may be made or composed of any suitable material such as.
wood metal mill-board or straw board or a combination of these materials as for
instance in the case under illustration I form it with the straw board sides A and
bind it with cloth or other suitable material which combined with the strengthening
bands a' forms a light portable & convenient apparatus.
At the one end of the said tube A I fix the wooden or other frame F having
the bottom grooves f into which the negative plate E slides the frame F being made
to fit any one size of the photographic negative plate H such as the standard photo-
graphic sizes which slide into these grooves f and f² made to receive thein the
said plates H being thus held substantially in the required position.
Immediately in front of these grooves I place if required the second grooves ƒ³ & ƒª
into which may be inserted the ground glass plate J for the better diffusion of
the light passing through the negative or photographic plate which is often desirable:
At the opposite end of the tube A or at any required distance along the interior I fix
the frame K having the aperture & in the centre in which aperture K I place the
sensitive plate D which may be held in position by the spring d or any of the
usual devices.
Between these arrangements for supporting the negative plate H at the one end &
the sensitive plate D at the other I provide also within the body A the third frame M
which is made to carry the lens m¹ which receives the picture from the negative H
and projects it upon the sensitive plate D.
A double cap or lid N and N is provided to close the sensitive plate end of
the body & protect, the sensitive plate D from all light except that passing through the
lens M. The small ring n² or other equivalent or handles may be placed on the lid N¹
or other parts for convenience in handling.
I set the aforementioned frames in such relative positions that an image of the
negative or photographic plate H is projected upon the sensitive plate D.
I do not confine myself to the details & composition of my camera as herein.
described & shewn as I may considerably vary them without departing from the
nature of my said invention as for instance the body A may be formed of any light
materials such as card board of the various kinds & light metal & many other variations
may be made.
Having now particularly described & ascertained the nature of my said
invention & in what manner the same is to be performed I declare that what
I claim is :-
(1) The improvements in cameras for making lantern slides or copying photographic
pictures consisting of the arrangement of the various parts substantially as herein set
forth & shewn upon the drawings.
(2) The improvements in cameras for making lantern slides or copying photographic
pictures in which such cameras are composed of straw card or other similar board &
bound together substantially as herein set forth & shewn upon the accompanying
drawings.
1000
WALTER GRIFFITHS.