Improvements in Optical Lanterns.
Year: 1892

page_text: Date of Application, 20th Oct., 1892
Complete Specification Left, 18th July, 1893-Accepted, 19th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Optical Lanterns.
WILLIAM RICE, of 86 Fleet Street, in the City of London, Publisher, do hereby
declare the nature of this invention to be as follows:-
-:
My invention consists in constructing apparatus for more effectively holding the
slide-carrier of the optical or magic lantern.
For this purpose I construct apparatus which shall be adjustable for various
thicknesses of carriers,, but which shall clamp any such carriers with equal
rigidity.
The invention can be carried out as follows:-I employ a ring made preferably
of metal attached to a collar which screws into or over the extension tube of the
lens. This ring attached to the screw is turned by means of a milled edge and can
be made to press the slide carrier firmly against the condenser-cell so as to prevent
any slipping during the operation of moving the inner frame of the carrier.
When it is required to place the slide carrier in position, the ring is screwed'
back into or upon the lens tube till there is sufficient space to insert the carrier.
The screw is then turned in the opposite direction reducing the aperture till the.
carrier is firmly pressed against the condenser cell.
By this means the ordinary pressure springs are done away with.
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WILLIAM RICE..
COMPLETE SPECIFICATION.
Improvements in Optical Lanterns.
I, WILLIAM RICE of 86 Fleet Street in the City of London, Publisher 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 in apparatus for more effectively holding or securing the
slide-carrier of an optical or magic lantern.
For this purpose I construct apparatus which shall be adjustable for various
thicknesses of carriers or slides, but which shall clamp any such carriers with equal
rigidity.
The invention can be carried out as follows:
I employ a ring, made preferably of metal, attached to or part of a collar which
screws into or over the extension tube of the lens at its rear end.
This ring,
attached to the collar, may have a milled or roughened edge, to facilitate turning
of the collar, which, by unscrewing, can be made to press the slido carrier firmly
against the condenser, or part in frout of the condenser, so as to prevent any
movement or slipping during the operation of moving the inner frame of the
carrier.
When it is desired to place the slide-carrier in position, the collar is screwed back
until there is sufficient space to insert the carrier. The collar is then turned in the
opposite direction, reducing the aperture until the carrier is firmly pressed against
the condenser cell or front of the lantern body.
By this means the use of ordinary pressure springs is avoided, and I obtain a
noiseless, easily adjusted and secure clamp by means of which slide carriers of
various thicknesses, or even glass or other plates, can be equally firmly secured.
מ'
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page_text: The ring or rim and collar may either be cast, stamped or formed in one piece,
or they may be in two or more parts suitably attached together.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a general view of an optical lantern with my screw clamp or
collar attached.
Figure 2 shows, partly in section, a side view of the screw collar and lens tube of
a well known form of lantern, the lens tube c with its backward extension or part e
being rigidly fixed to the supporting part g, which slides in grooves in the base h
(see Figure 1) of the lantern; but this construction apart from the application of
my screw collar, is well known, and forms no part of my invention.
Figure 3 shows a front view of Figure 2.
a is the screw collar, the threads d of which engage with the screw threads of the
tube c.
e represents a part fixed to the base g, which part surrounds or is in front
of the condenser.
By turning the collar a, by means of the rim b, the space f(see Figure 2) in
which the slide-carrier is inserted, either reduced or enlarged, and the carrier
clamped or released according to the direction of rotation of the collar.
In some forms of lanterns the part e is entirely absent or a modified form of
abutment for the carrier is employed.
It is obvious that instead of the screw collar being applied in front of the slide-
carrier, it may, in some cases, be applied behind it, as for instance in Fig. 2, the
collar may be screwed over or into the part e; and in cases where the condensers
are let in flush with the front of the lantern body, it may be screwed over or into
a metal collar or ring surrounding and projecting in front of the condensers and
attached to the front of the lantern body; or attached in a similar manner.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is.
A screw collar or attachment for securing in place a slide-carrier or similar part
of an optical lantern, substantially as described."
Dated the 15th day of July 1893.
WILLIAM RICE.