Improvements in Lanterns.
Year: 1892

page_text: Date of Application, 23rd Sept., 1892
Complete Specification Left, 1st Mar., 1893—Accepted, 8th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Lanterns.
I, VINCENT GROOM of Oaken Wolverhampton in the County of Stafford
Gentleman do hereby declare the nature of my said invention to be as follows:-
My invention has for its object improvements in lanterns and refers more par-
ticularly to those which are used in the case of photography for developing and
which improvement may be also applied to other lanterns such as a policeman's
lantern so as to render them capable of being used for the two purposes.
In carrying my invention into effect I form my lantern with a cone or cylinder
for supporting the glass or lens which cone or cylinder may be mounted on the door
of the lamp as in an ordinary policeman's lantern and between the door and the
lens or glass form a slot or slots which may be either at the lens end or the door
end and in these slots I insert a coloured glass suitable for the purpose required.
These pieces of glass slide in and out and the same lantern may be darkened in
any suitable way as for instance by a cylinder as in the ordinary policeman's
lanterns or by means of the arrangement shewn in my former Patent No. 22,586
A.D. 1891 or by means of a disc upon a cranked lever.
In order to properly
reflect the rays through the small end of the cone I form my reflector in the shape
of a segment of a circle and I provide a projecting removable cap over the outer
lens or glass to deflect the light on to the tray when developing photographic
work.
Dated this 22nd day of September
1000
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.
COMPLETE SPECIFICATION.
Improvements in Lanterns.
I VINCENT GROOM of Oaken, Wolverhampton in the County of Stafford
Gentleman 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 refers to lanterns for photographic purposes, and its object is
to provide an improved combination and arrangement whereby a non-actinic
light of various degrees for developing and other similar photographic processes,
and an actinic light for printing bromide or other papers requiring an intense
artificial white light, may be readily obtained; also whereby the operator is
enabled to very sensitively measure and control the said exposure, the whole
being combined and effected in a simpler manner than heretofore.
In carrying my invention into effect I form my lantern with a
cylinder for supporting the glass or lens.
cone or
In some cases this may be carried upon the door of the lantern, when the said
door is arranged at the front, but generally it is preferred to arrange the door
at the back, hence the glass or lens &c. is arranged upon the front wall of the
lantern, as hereinafter described and shown.
Between the said front and the lens or glass 1 form a slot or slots which
may be near the inner or the outer end of the cone, and in these slots I insert
a coloured glass or glasses, suitable for the purposes required. These pieces of
glass slide in and out, and the said lantern may be darkened, that is, the total
light cut off, by means of the arrangement shown in my former Patent No. 8252
Гр

page_text: of 1892, or similar means.
In order to reflect the rays through the small end of
the cone, I form my reflector in the shape of a segment of a circle, and in some
cases I may provide a projecting removeable cap over the outer lens or glass to
deflect the light on to the tray when developing photographic work, but from the
arrangement and construction shown, I do not find this generally needed. I will
now proceed to more particularly describe my invention by the aid of the
accompanying sheet of drawings upon which are figures and numbers of reference
similar numbers referring throughout the several views to the same thing or part,
and in which :-
Fig. 1, is a general view in elevation of this my improved lantern.
Fig. 2, is a part sectional side elevation of my invention.
Fig. 3, is an enlarged sectional part plan view on line A-B Fig. 1.
Fig. 4, is a detailed view of the disc and lever arrangement, by which the total
light of my improved lantern is shut off.
1, is the body of the lantern, which may be of any desired shape. 2, is the oil
container or lamp. 3, is the wick winder. 4, is the reflector, which may be
removably or permanently attached to the lamp. 5, is an inwardly reflecting cone
having the usual contracted aperture at 6, at the outer end of which is the clear
glass lens 22. 7, 7%, are coloured glass slides, which may both be of a ruby colour,
but preferably the one 7, is of a ruby colour while the other 7", is of an orange tint,
so that a non-actinic light of various degrees may be readily obtained. These
glasses may be mounted in suitable metallic frames, 8, 8", which slide in the grooves
or slots 9, and 9ª, formed in the framework 10, on the front of the lantern.
and 11, are caps or covers formed on the ends of the frames 8, 8ª, which fit on to,
and cover the open ends 12, 128, of the slots or grooves in the framework 10, when
the aforesaid sliding coloured glasses are in their closed position, and thereby
prevents any ray of actinic light escaping therefrom.
11,
Carried in suitable bearings 13, 13, is the horizontal spindle 14, to which is con-
nected the pendulous disc 15, by means of the rod 16. This disc 15, (as may be
seen) is arranged to cover the aperture 6, or to be removed clear of it. At the
other end of the spindle 14, is the double ended pressure bar 17, having the
tips 18, 18. 19, is a cam upon the spindle 14, whose irregular or non-concentric
form impinges upon the spring 20, and thereby retains the disc 15, in its open or
closed position, without fear of unwilled or accidental movement. I have shown in
dotted lines a hood or deflector 21, which may be removably or permanently
attached to the front of the lantern, over the outer clear glass or lens 22, to deflect
the light on to the developing trays &c., and to shield the light from the operator's
eyes, but as before mentioned, this hood would not generally be needed.
It will now be clearly seen that when it is desired to use my improved dark
room lantern for photographic work such as developing &c., in which a pale non-
actinic light is required, the one orange tinted glass slide 7ª, is slid in or closed,
but when less light is required the ruby slide 7, is inserted instead of 7ª, while,
when a still deeper non-actinic light is required (as generally understood for more
sensitive photographic processes,) both of the slides are slid or closed.
"
Further, when it is required to use my improved lantern for printing bromide or
other papers requiring intense artificial white light, where a
"time exposure to
actinic light is required, I proceed as follows:-By pressing down the tip 18, the
aperture 6, will be covered by the disc 15, and all light excluded; both the glass
slides 7, and 7, are now withdrawn as seen in Fig. 3. To make the exposure the
tip 18, is pressed down, which removes the disc 15, from the front of the aperture 6.
When the exposure is complete, the tip 18, is again quickly pressed down aud the
light is instantly shut off, the glass slide or slides may then be slid in, and the
exposed print developed.
It will be clearly seen by these means, the length of an exposure to actinic light,
can be very sensitively measured and controlled and the light of the lamp again be
very quickly and readily made non-actinic.
As before mentioned I do not wish in this my application for Patent to claim the

page_text: arrangement for the total shutting off of the light, in and of itself, as this arrange-
ment forms subject matter of my Patent No. 8252 of 1892, but :-
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
1. The combination with the lautern 1, lamp 2, cone 5, coloured glasses 7, and 7,
of the shutting off disc 15, and its attendant mechanism, constructed, arranged, and
operating substantially as hereindescribed and illustrated, upon the drawings.
2. In photographic lanterns, the carrying of the coloured glass slides 7, and 7*,
in grooves substantially as shown and described.
Dated this 28th day of February 1893.
CHARLES T. POWELL,
Applicant's Agent.