Improvements in Projecting Lanterns.
Year: 1889

page_text: Date of Application, 15th Aug., 1889-Accepted, 21st Sept,, 1889
COMPLETE SPECIFICATION.
Improvements in Projecting Lanterns.
I, HERBERT CHARLES NEWTON, Optician, of 3 Fleet Street in the City of London,
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 :-
The object of the present invention is to facilitate the projection onto an ordinary
screen, of objects, which, from their nature, must lie in a horizontal position, and
are incapable of occupying the ordinary position occupied by slides in projecting
lanterns.
Hitherto the projection of horizontally placed objects has been effected in the
following manner :-
The beam of light from the lantern is received upon a mirror placed at an angle,
so as to reflect the beam vertically. A simple horizontal lens receives this beam, and
converges it through the object, also placed horizontally, in an upward direction, onto
the focussing lens, situated above it. The image is then received upon a second
mirror, and thereby reflected onto the screen.
This arrangement has the disadvantage of being tedious and difficult, when
it is desired to show a horizontally placed object amongst a number of objects
which need not be placed horizontally, and is also objectionable on account of the
loss of light which the multiplicity of the mirrors and the situation of the lenses
involves.
With the view of obviating these objections, I propose to employ a pair of
ordinary dissolving view lanterns mounted one over the other, but the upper one
I hinge to the lower at its back part, so as to make it capable of tipping
backwards, and projecting an image in an upward, instead of a horizontal direction.
A single mirror is employed to receive the image, and reflect it onto the ordinary
screen.
In the accompanying drawing,
Fig. 1 shews in side elevation a Lantern, or pair of Lanterns, constructed according
to my invention, with the upper lantern arranged to project horizontally in the
ordinary way.
Fig. 2 is also a side elevation, but the upper lantern is tipped backwards, for the
purpose of projecting the image of an object, which must not be moved out of
the horizontal.
The lanterns themselves may be of an ordinary construction employing the
oxyhydrogen or electric light, but the bottom framing of the upper lantern A¹, is
hinged to the back part of the top framing of the lower lantern A.
a are metal bracket pieces situated on either side of the lantern to hold the lantern A'
in the tipped position of fig. 2. b. is the mirror, hinged near the focussing lens, for
reflecting horizontally the image upwardly projected from the lantern.
c is a set screw for securing the focus adjustment slide when the lantern A¹ is in
the tipped position, and c¹ is another screw for securing the lamp tray under similar
circumstances.
The slide holder d. is preferably made removable, to allow of its being taken away
when the lantern A' is in the position of Fig. 2.
In thus mounting the upper lantern on the lower, no constructive changes will be
necessary, excepting the addition of the mirror b. The taps, pipes, &c., at the back
of the lantern, will be no inconvenience, owing to the raised position which the
lantern occupies.
In employing the lantern for projecting a horizontal object, it will only be
necessary to tip the upper part A¹ into the position of Fig. 2, which can be done
Гр...

page_text: while the lower lantern is in operation, and adjust the focus and reflecting
mirror.
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
1 claim is :-
A projecting lantern hinged to its base in the manner described, so as to be
capable of projecting an image either horizontally or vertically at will, and the com-
bination therewith of a single mirror, or its equivalent, for reflecting an upwardly
projected image horizontally onto a screen.
Dated this 15th day of August 1889.
NEWTON & SON,
Agents for the Applicant.