Improvements in Magic Lanterns.
Year: 1889

page_text: Date of Application, 26th Apr., 1889
Complete Specification Left, 18th Jan., 1890-Accepted, 22nd Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Magic Lanterns.
We, CHARLES GRAY, of 11 Crooked Lane, King William Street, and HENRY KEMP
of 7 and 8 Thavies Inn both in the City of London, Opticians do hereby declare the
nature of this invention to be as follows:-
Our invention relates to magic-lanterns for producing dissolving view effects
In dissolving view lanterns as heretofore constructed it has been usual to provide
each set of lenses with independent illuminating apparatus, which arrangement, when
oil lamps are used for effecting the illumination, renders it necessary to place the
lenses side by side.
According to our invention we employ one set of illuminating apparatus in connection
with two or more sets of lenses whereby we are enabled to place the said lenses one
over the other and thus produce an oil illuminated lantern which is more compact
than those heretofore constructed.
In carrying out our invention we advantageously place the lamp or other
illuminating apparatus upon a moveable platform or stage by means of which the said
illuminating apparatus can be placed in connection with either set of lenses. The
said platform is advantageously moved by means of a rack and pinion, but any other
suitable mechanism may be employed for the purpose.
In some cases we use only a single condenser which is placed on the platform with
the illuminating apparatus and is moved therewith so as to operate in conjunction with
either set of magnifying lenses.
Although we prefer to arrange our improvements in a lantern in which the several
sets of lenses are arranged in a vertical line, it is to be understood that our said
improvements are equally applicable to lanterns the lenses of which are placed in a
horizontal line.
D
11
0
,
1 100
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Magic Lanterns.
We, CHARLES GRAY, of 11, Crooked Lane, King William Street, and HENRY KEMP,
of 7 and 8, Thavies Inn, both in the city of London, Opticians, 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 :—
Our invention relates to magic lanterns for producing dissolving view effects.
In dissolving view lanterns as heretofore constructed, it has been usual to provide
each set of lenses with independent illuminating apparatus, which arrangement, when
oil lamps are used for effecting the illumination, renders it necessary to place the
lenses side by side.
According to our invention, we employ one set of illuminating apparatus in
connection with two or more sets of lenses, whereby we are enabled to place the said
lenses one over the other and thus produce an oil illuminated lantern, which is more
compact than those heretofore constructed.
In carrying out our invention, we place the lamp, or other illuminating apparatus
upon a movable platform or stage, by means of which the said illuminating apparatus can
be placed in connection with either set of lenses, the said platform being advantageously
moved by means of a rack and pinion, but any other suitable mechanism may be
employed for the purpose.

page_text: To enable our invention to be fully understood, we will describe the same with
reference to the accompanying drawing, in which-
Figure 1 is a sectional side elevation of a lantern provided with our improvements.
Figure 2 is a section on the line aa of figure 1, the lamp being removed.
Figure 3 is a view similar to figure 2 but showing the platform and the lamp
thereon in a different position.
a is the body of the lantern and b, b are objectives or lenses.
c is the movable platform, at the front of which is an upright extension d, sliding
in guides d', d', set to the body of the lantern, the said guides serving to steady the
said platform.
e is a rack attached to the upper part of the extension d; and f is a pinion engaging
with the said rack, and having attached to its shaft a handle g for operating the
same.
indicates an oil lamp, which is mounted upon the platform c; and i is a
condenser which is secured to the upright extension d so as to move with the
lantern. It is to be understood, however, that a separate condenser can be fixed in
conjunction with each objective, in which case the lamp or illuminating apparatus
alone will be movable.
It will be obvious that by rotating the handle g the platform c can be raised from
the position shown in figure 1 to that shown in figure 3, so as to bring the lamp and
condenser level with the upper lens.
Although we have described our improvements as applied to a lantern in which the
lenses are arranged one above the other, it is to be understood that our improvements
are equally applicable to lanterns in which the lenses are placed side by side.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
1. A magic-lantern having two or more lenses, and a single lamp or illuminating
apparatus, the said illuminating apparatus being mounted upon a platform adapted to
be moved so as to bring it opposite to either lens, substantially as described.
2. In a magic-lantern, the illuminating apparatus of which is adapted to be moved
to bring it opposite to either lens, mounting the condenser so that it will move with
the said illuminating apparatus, substantially as described.
3. In a magic-lantern, mounting the lamp or other illuminating apparatus upon a
platform adapted to be moved vertically in guides by means of a rack and pinion,
so that the said illuminating apparatus can be placed opposite either lens, substantially
as described.
Dated the 10"
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.