Improvements in and connected with Photographic Cameras.
Year: 1892

page_text: Date of Application, 18th Jan., 1892
Complete Specification Lelt, 15th Oct., 1392-Accepted, 19th Nov.. 1992
PROVISIONAL SPECIFICATION.
Improvements in and connected with Photographic Cameras.
We, ALEXANDER JEFFREY, and GEORGE WISHART, of 140, West Nile Street,
Glasgow, in the County of Lanark, North Britain, Camera Makers, do hereby
declare the nature of this invention to be as follows, that is to say:-
This invention comprises various improvements in photographic cameras and
their accessories which by means of them are rendered more convenient and
satisfactory in use, whilst other advantages are also secured.
An improved camera as made with some of the improvements comprises a main
frame fitted to receive the photographic plate or dark slide containing it, and
having attached to it a pyramidal bellows the smaller end of which has fixed to
it a small board or lens frame having the lens holder secured to it.
The lens frame
is jointeil at the middles of its ends to small metal bars, each of which has one end
jointed to what is termed the base board; and this base board is hinged to the
main frame. The other ends of the small bars have fixed in them pins fitted to
slide in slots in side bars jointed to the main frame at the corners of the side
opposite to that at which the base board is hinged. With this construction the
lens frame can be moved inwards with the bellows close up to the main frame, or
it can be drawn out to a suitable focussing distance, and in the latter position is
held firm by the pins in the small bars engaging in notches in the side bars.
The
base board may be made of wood, in which case it is made of a U-shape instead of
with a central hole; or instead of such a board there may be substituted a pair of
slotted side bars like those on the other side. Adjustable stops are provided to
determine the precise angle to which the base board is to be opened these consisting
of round-headed screws in the frame and adjustable flat-headed screws in the base
board. The small bars immediately carrying the lens frame are jointed to plates
which are adjustable on the base board or side bars for the purpose of regulating
the focal distance; and instead of permanently fixed pins on the ends of the small
bars there may be button-headed screws by means of which the small bars can be
clamped in desired positions on the side bars. The attachment of the side bars to
the main frame may also be made adjustable.
The main frame is made with the usual groove to receive the dark slide; and
when the dark slide is made for two plates light is prevented from entering between
the two parts by a rib of rubber or other suitable flexible material fixed in a groove
in one part and entering a groove in the other part when the two parts are closed
together.
Instead of the ordinary dark slide we in some cases use a dark slide made of
paper or other suitable thin material and made just large enough to hold a single
plate. This slide is made with a back and a front part, the bottom and side edges
of the back part being doubled over and cemented at the corners to form grooves
to receive the plate and the front part, which last is made with an extension or flap
at its outer end by means of which it is taken hold of to be drawn out for exposure
when in the camera.
A stop is provided to prevent the movable part being drawn
out too far. A camera may be made with slide grooves suitable for the new dark
slide, in which case the camera can be made smaller for a given size of plate; or
an adapter frame may be provided to fit in the grooves of a camera of ordinary
size, this adapter frame being made with grooves for receiving the new dark slide.
The new dark slide is made black or otherwise impervious to actinic light. The
cost of such slides will be very small, and sensitive plates may be put up in them

page_text: at once by those who prepare such plates, and who can have their advertisement
printed on the outsides of the slides.
Dated this Sixteenth day of January 1892
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in and connected with Photographic Cameras..
We, ALEXANDER JEFFREY, and GEORGE WISHART, of 140 West Nile Street,
Glasgow, in the County of Lanark, North Britain, Camera Makers 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, that
is to say :-
:-
This invention comprises various improvements in photographic cameras and
their accessories, which by means of them are rendered more convenient and
satisfactory in use, whilst other advantages are also secured.
An improved camera as made with some of the improvements comprises a main
frame fitted to receive the photographic plate or dark slide containing it and
having attached to it a pyramidal bellows the smaller end of which has fixed to it
a small board or lens frame having the lens holder secured to it. The lens frame
is jointed at the middles of its ends to small metal bars, cach of which has one end
jointed to what is termed the base board; aud this base board is hinged to the
main frame. The other ends of the small bars have fixed in them screw pins fitted
to slide in slots in side bars jointed to the main frame at the corners of the side
opposite to that at which the base board is hinged. With this construction the
lens frame can be moved inwards with the bellows close up to the main frame, or
it can be drawn out to a suitable focussing distance and in the latter position is
held firm by the screw pins in the small bars engaging in notches in the side bars.
The invention also comprises the application, in ordinary double dark slides, of
a rib of rubber or other flexible material fixed in one part and entering into a
groove in the other part when the two parts are closed. A new form of dark slide
made of paper or other suitable flexible material and which may be applied to
the camera in an adapter frame is also covered by the invention.
And in order that the said invention and the manner of performing the same
may be properly understood, we hereunto append two sheets of explanatory
drawings, to be hereinafter referred, and showing examples of the improvements in
and connected with photographic cameras.
Figure, 1, of the drawings is a side elevation and Figure, 2, an inverted plan of
one example of the improved camera, Figures, 3, and 4, being similar views
of another example. Figure, 5, is a longitudinal section of an improved dark
slide of the usual type. Figure, 6, is an elevation and Figure, 7, a transverse
section of the back part of a new dark slide, Figure, 8, being an elevation, and
Figure, 9, a longitudinal section of the front part of the same. The new slide is
made of paper or other thin flexible material and it is delineated in Figures, 6,
and 8, with its folds completely spread out, dotted lines being employed to represent
the creases or folds. Figure, 10, is a front and Figure, 11, an end elevation of an
adapter frame made to receive the dark slide..
In these drawings the same reference letters and numerals are used to mark the
same or like parts wherever they are repeated.
An improved camera as made according to one example and as shown in
Figures, 1, and 2, of the drawings comprises a main frame, A, fitted to receive the
photographic plate or dark slide containing it, and having attached to it a pyramidal
bellows, B, the smaller end of which has fixed to it a small board or lens frame, C,
to which the lens holder (not shown) is to be secured. The lens frame, C, is jointed
at the middle of its ends by pins, C1, to small metal bars, C 2, each of which has

page_text: one end jointed by pins, C 3, to what is termed the base board, D, and this base
board, D, is hinged to the main frame, A. A slot, C4, is formed in the small
metal bars, C2, to permit of the lens frame, C, being adjustable on the bars. The
other ends of the small bars, C2, have fixed in them screw pins, E, made with flat
circular heads and fitted to slide in slots, F, formed in side bars, F1, jointed by
pins, F 2, and a bar, F 3, to the main frame, A, at the corners of the side opposite
to that at which the base board, D, is hinged. With this construction the lens
frame, C, can be moved inwards with the bellows, B, close up to the main frame, A.,
so as to present a neat and compact appearance or it can be drawn out to a suitable
focussing distance and in the latter position is held firm by the screw pins, E, in the
small bars, C2, engaging in notches, E 1, in the side bars, F 1. The base board, D,
is made of wood and of a U-shape instead of with a central hole. Adjustable
stops are provided to determine the precise angle to which the base board, D, is to
be opened these consisting of adjustable round-headed screws, A 1, in the frame
and flat-headed screws, D 1, in the base board. The small bars, C 2, carrying the
lens frame, C, are jointed to plates, D2, which are adjustable on the base board, D,
by means of sluts, D3, (formed in the plates) and screws, D4, for the purpose of
regulating the focal distance; and by means of the flat-headed screws, E, the
small bars, C2, can be clamped in desired positions on the side bars, F1. The
side bars, F1, are jointed by pins, F 2, to a bar, F3, of brass or other suitable
material, which is fixed to the main frame, A, by screws, F4, placed a little way
from the ends of the bar so as to allow of the ends of the bar springing a little.
Catch plates, G, are fixed to the main frame, A, and a hole, G 1, is formed in each
to engage with pins, D5, (fixed in the ends of the base board, D,) when the
pyramidal bellows, B, is compressed close up to the main frame, A.
In the example shown in Figures, 3, and 4, a pair of slotted side bars, H, like
the bars, F 1, on the other side are substituted for the U-shaped base board, D.
Screw pins, H 1, fixed in the ends of the small bars, C2, are fitted to slide in the
slots, H 2, formed in the bars, H, and are provided to enable small bars to be
clamped at any position on the bars, H. The small bars, C2, are fixed to the
lens frame, C, by pins, J. The attachment of the side bars, F 1, to the main
frame, A, may if desired be made adjustable. The slotted bars, H, may if
desired have fixed to then a U-shaped base board, D6, as indicated by dotted
lines in Figure 4.
The main frame, A, is made with the usual groove, L, to receive the dark
slide, M, an example of which is shown in Figure, 5, Sheet, 2. The dark slide, M,
is made for two plates and light is prevented from entering between the two
parts by a rib, M 1, of rubber or other suitable flexible material, fixed in a groove
in one part and entering a groove, M 2, in the other part, when the two parts are
closed together.
Instead of the ordinary dark slide, M, we in some cases use a dark slide made
of paper or other suitable thin material, and made just large enough to hold a single
plate. This slide is made with a back part, N, and a separable front part, P,
respectively shown in Figures, 6, 7, 8, and 9. The bottom and side edges of the
back part, N, are doubled over and cemented at the corners to form grooves, Q, to
receive the plate and the front part, P, which last is made with an extension or
flap, P 1, at its outer end, by means of which it is taken hold of to be drawn out for
exposure when in the camera. A stop, P2, is provided to prevent the movable
part being drawn out too far. A camera may be made with slide grooves suitable
for the new dark slide, in which case the camera can be made smaller for a given
size of plate; or an adapter frame, R, Figures, 10, 11, may be provided to fit in the
grooves of the camera this adapter frame being made with grooves, R 1, for receiving
the new dark slide.
The
The new dark slide is made black or otherwise impervious to actinic light.
cost of such slides will be very small; and sensitive plates may be put up in them
at once by those who prepare such plates, and who can have their advertisements
printed on the outsides of the slides.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
.
1. The combination and arrangement of parts constituting the improved photo-
graphic camera substantially as herein before described and as shown in Figures, 1,
and 2, of the accompanying drawings.
2. The combination and arrangement of parts constituting the improved photo-
graphic camera substantially as herein before described and as shown in Figures, 3,
and 4, of the accompanying drawings.
3. In a photographic dark slide made for two plates the application of a rib of
rubber or other flexible material fixed in one part and entering a groove in the other
part substantially as and for the purposes hereinbefore described.
4. In connection with photographic cameras an improved dark slide made of
paper or other suitable thin material substantially as and for the purposes
herein before described and as shown in Figures, 6, 7, 8, and 9, of the accompanying
drawings.
Dated this Fourteenth day of October 1892.
EDMUND HUNT,
Applicants' Agent.