Improvements in Frames for Printing Magic Lantern Slides.
Year: 1892

page_text: Date of Application, 15th Nov., 1892
Complete Specification Left, 15th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Frames for Printing Magic Lantern Slides.
I, CLAUD SYMS SCOTT, of Brabourne, The Drive, Walthamstow, in the County
of Essex, Engineer, do hereby declare the nature of this invention to be as
follows:
--
I improve the frames for printing magic-lantern slides from photographic
negatives by providing means whereby the position of the negative is adjustable
relatively to the slide, whereby the relative positions of the negative and the slide
can be readily and exactly reproduced at will, and whereby the adjustment of the
relative positions of the slide and the negative is made with greater facility than
heretofore.
My improved frame consists mainly and essentially of four parts: first, a frame
of wood or other material having a front aperture approximating to the size of the
slide for the admission of light, and also having a back rim provided with springs,
catches, or other devices of ordinary or special construction for the purpose of
holding the back of the frame, the negative, the slide, and other parts steadily in
position. Second, a plate of brass or other suitable material of about the thickness
of the negative, sliding in the above described frame, and having an aperture to
fit and hold the negative; this plate has one or more lugs or extensions formed on
its edges, said lugs or extensions passing through the back rim of the above
described wooden frame, and serving to assist in the adjustment of the said brass
plate together with the negative which fills the aperture therof: the lugs or
extensions are marked off in divisions on their outer ends so that any position of
the brass plate and its contained negative relatively to the wooden frame and the
lantern slide, can be noted and reproduced at will. Third, a sheet of cardboard or
other suitable material cut to fit inside the back rim of the wooden frame, and
having an aperture to fit the lantern slide so situated that the true and proper
position of the said slide opposite the light aperture is ensured when it is placed in
the aperture of the sheet of cardboard or other material.
Fourthly, a back-piece of wood or other material, provided with a pad of cloth
or leather and capable of being fixed and held into the outside frame by the above
mentioned springs or catches.
The light aperture in the front of the wooden frame is chamfered in order to
prevent the casting of any shadows on to the exposed portion of the negative.
I provide set screws in the rim of the outside wooden frame which screw down
on to the lugs or, extensions of the brass plate and serve to hold said brass plate in
position.
Brass frames having lugs or extensions as above described may also be
advantageously applied to printing frames in which it is desired to adjust and
reproduce the exact position of the lantern slide relatively to a fixed negative.
Further, I may employ two such brass frames, the lug or extension of one passing
through the end of the outside wooden frame, and the lug or extension of the
other passing through the side of the outside wooden frame, so that the position of
the negative or of the slide, as the case may be, can be adjusted and registered in
two directions at right angles. By this means any relative positions of the slide
and the negative can be obtained and exactly reproduced. It is obvious that when
two brass frames are employed the aperture of each must be lengthened or slotted
in a direction at right angles to its lug or extension in order to permit of the
adjustment of the slide or of the negative in that direction by the other brass
frame.
.

page_text: When two brass frames are used, one of the two may be formed without any
lug or extension but in such a way that it will conveniently slide in the lengthened
or slotted.aperture of the other, and thereby render possible the adjustment in two
directions at right angles. In this case numbered divisions would be marked on the
side of the slotted aperture of the brass frame having the lug or extension, and
convenient means would be provided for fixing and holding the two brass frames.
together and maintaining the proper position of the slide or of the negative as the
case may be.
It will be seen that when the brass frames are used to adjust the slide instead of
the negative, some modifications of the parts of the printing frame described in the
earlier part of this Specification will be necessary. In order to ensure the proper
action of the brass-frame or frames on the thin glass of the slide, it may be found
advantageous to surround said slide with a narrow frame of any suitable material
and of greater thickness than the glass.
When using this printing frame, all adjustments may be made in ordinary light
and the glass plate with its sensitive film which is to form the lantern slide, can then
be placed in position in the frame in a totally dark room if the usual photographer's
dark room with non-actinic light is not available. .
Dated this 25th day of October 1892.
COMPLETE SPECIFICATION.
Improvements in Frames for Printing Magic Lantern Slides.
I, CLAUD SYMS SCOTT, of Brabourne, The Drive, Walthamstow, in the County
of Essex, Engineer, 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:→
By this invention I improve the frames for printing magic lantern slides from
photographic negatives, by providing means whereby the position of the negative
is more readily adjusted in reference to the slide than heretofore, and whereby
any relative positions of the negative and of the slide can be exactly reproduced
at will.
A printing frame constructed according to my invention will usually consist of
the following principal parts; first, a frame of wood or other material having an
aperture in front for the admission of light approximating in size to the size of the
slide, and also having a back rim provided with springs or catches of ordinary or
special construction for the purpose of holding the frame, the negative, the slide,
and other parts steadily in position; second, a centering plate of brass, cardboard, or
other material, cut to fit inside the back rim of the wooden frame above mentioned,
and having an aperture to fit the lantern slide, so situated that the true and proper
position of the said slide opposite the light aperture is ensured when it is placed in
the aperture of the centering plate of cardboard or other material; third, a sliding
plate of brass or other suitable material, sliding between the back rims or edges of
the above described frame, or in guides attached thereto, and between the said
frames and the cardboard or brass centering plate, said sliding plate having an
aperture to fit and hold the negative, and also having lugs or extensions which pass
through the back rims or edges of the wooden frame for the purpose of facilitating
exact adjustment: I may employ two such sliding plates and said sliding plates
are also applicable to the control and adjustment of the lantern slide in reference
to a fixed negative, as will be hereinafter described. Fourth, a back-piece of wood
or other material, provided with a suitable pad of cloth or leather, and capable of
being fixed and held into the outside wooden frame by the above mentioned springs
or catches.

page_text: In describing the manner in which I carry my invention into practice, I make
reference to the accompanying drawings in which
Fig. 1 is a back view of a simple form of printing frame constructed according to
my invention.
Fig. 2 is a transverse section of the same.
Fig. 3 is a back view of a frame in which two sliding plates working at right
angles are employed to adjust the position of the lantern slide with reference to a
fixed negative.
Fig. 4 is a transverse section of the same.
Figs. 5, 6, and 7 are skeleton diagrams showing three further methods in which
the sliding plates with their lugs or extensions passing through the back rim of the
wooden frame, may
be used to adjust and indicate the exact position of the negative
or of the slide as the case may be.
In Figs. 1 and 2 a is a wooden frame having a light aperture 6 and a back rim or
edge c. d is a centering plate of cardboard or brass which fits inside the rim c
and has a rectangular aperture holding the lantern slide e exactly opposite the
light aperture b. The sliding frame carries the negative g, and has a lug or
extension passing through the back rim of the wooden frame: by means of this
lug or extension it is possible to slide the plate f, carrying the negative, to and fro
between the light aperture and the lantern slide, and thereby to bring any desired
portion of the said negative opposite to said lantern slide for printing. The lug or
extension is marked off in divisions so that any particular position of the sliding
plate, with its contained negative, may be noted and reproduced at will.
means of the set-screw i, the lug h is firmly gripped and the sliding plate is held
in the desired position. With the object of attaining greater clearness in the
drawings, I omit the wooden back-piece which is inserted at ; and is held in position
against the lantern slide by the spring catches k.
By
It will be seen that the printing frame as shown in Figs. 1 and 2, only
admits of adjustment being made in one direction, but on reference to Figs. 5, 6,
and 7 it will be seen in what manner the sliding frames may be employed to obtain
adjustment in more than one direction. In Fig. 5 the sliding plate f, has two lugs
or extensions, and h, with two set-screws i̟, and i̟ working in slotted plates 3 and 51,
the lugs and slots being marked off in divisions as shown by this arrangement the
negative may be moved sideways or lengthways and may also be turned through an
angle if desired, its position being indicated by the divisions marked upon the lugs
and slots. In this figure the centering plate and wooden back piece are omitted.
:
In Fig. 6 I illustrate a method of guiding the sliding plate f. which is very
convenient in certain cases, particularly in frames of the type represented in Figs. 1
and 2. The plate slides between two pieces of brass or wood to to, which are
capable of turning on pivot screws a₁ the plate being an easy fit between the
guides, a certain amount of turning movement may be given to said plate in
addition to its longitudinal sliding movement.
:
Figs. 3 and 4 show a form of frame in which two sliding plates f₁ and ƒ„, with
lugs h₁ and h, working at right angles are employed to adjust and reproduce any
position of the lantern slide in reference to a fixed negative. In this case the
aperture 6, in the wooden frame a₁ is made large enough to contain the negative
and is provided with suitable arrangements for holding the same in position.
Fig. 7 shows a modification of the sliding plate to fulfill the same object as that
achieved by the arrangement shown in Figure 6. A wooden frame to contain this
plate would be made slightly wider than is shown in Figs. 1 and 2, while the sliding
plate is provided with the circular projecting portions 14, which retain the centre
of the negative on the centre line of the lantern slide, but nevertheless permit
certain amount of rocking or turning movement on the part of the said negative in
cases where it may be desired in printing to correct any lack of uprightness on the
part of the negative.
a
Referring again to Figs. 3 and 4, it will be observed that the lantern slide is
contained in a square frame m placed in the square space formed by the intersection

page_text: of the two sliding plates, and f. It should also be observed that one of the said
plates, and may, with slight inconvenience, be dispensed with, so long as
provision is made for fixing and determining the position of the frame m in the
rectangular slot of the sliding plate which remains, by means of suitable markings
and set-screws. I show no wooden back piece as it will be of ordinary construction,
but I do show a back clip n in these Figs. 3 and 4, specially constructed to hold
such a wooden back-piece against the slide in whatever place said slide may be.
One end of the clip n slides along a bar o, whilst the other end
may be
the plate p.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
sprung
under
A frame for printing magic lantern slides from photographic negatives, having
one or more sliding plates with lugs or extensions projecting through the sides or
ends of the frame for the purpose of facilitating the adjustment and reproduction
of any relative positions of the slide and the negative, said sliding plate or plates
or the lugs or extensions thereof being marked off in divisions at suitable places, all
substantially as and for the purposes stated.
Dated this 15th day of August. 1893