Improvements in and relating to Optical Lanterns, Science Lanterns, and Enlarging Apparatus.
Year: 1895

page_text: Date of Application, 19th Jan., 1895
Complete Specification Left, 18th Oct., 1895-Accepted, 23rd Nov., 1895.
PROVISIONAL SPECIFICATION.
Improvements in and relating to Optical Lanterns, Science Lanterns,
and Enlarging Apparatus.
JOHN HENRY BARTON, 111 New Bond Street London, County of Middlesex,
Optician's Assistant, and JOHN STUART 111 New Bond Street London, County
of Middlesex, Optician, do hereby declare the nature of this invention, to be as
follows:-
The idea of this invention is that the:"hood," "shield:" or body" of an optical..
lantern, science lantern or enlarging. lantern, is so constructed. that it can be slid or
drawn upwards several inches, and held in that position by suitable mechanical
means.
This "hood" "shield" or "body" may be of any suitable. form, and in order to
arrive at the upward sliding motion aforesaid, it is provided with suitable-fittings.
running in guides, or grooves, or other convenient bearing.
"
When the "hood" "shield or "body" aforesaid is raised the lime light jet, oil- -
lamp, incandescent gas lamp &c. is left entirely free for manipulation and adjust
ment, and when this is satisfactory, the said "hood" "shield" or body" is
lowered, thus closing in the light.
Dated this: 18th day of January.1895.
JOHN HENRY BARTON.
J. STUART
Improvements in and relating to Optical Lanterns, Science Lanterns,
and Enlarging Apparatus.
We, JOHN HENRY BARTON of 111 New Bond Street in the County of London,
Opticians Assistant and.JOHN STUART of 111 New Bond Street aforesaid Optician
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 this invention is to provide means whereby ready access is gained,
when required, to the lamp, or light giving device of optical, or science, lanterns,
or enlarging apparatus.
According to this invention the hood, shield, or body, which encloses the lamp,
or light giving device, is so constructed that it can be slidden, or moved, upwards,
to expose the lamp, or light giving device, for which purpose the said hood, shield,
or body, is provided with fittings which can be slidden in, or on, guides, grooves, or
other convenient bearings, on, or in, the frame, or part, which carries the said hood,
shield, or body. Means are provided for holding the said hood, shield, or body, in
the raised position.
The accompanying drawing represents so much of an optical, or science, lantern,
or enlarging apparatus, as is necessary to illustrate the application of this invention
thereto. The invention is not however limited to the precise arrangement shewn
in the drawings.

page_text: Figures 1 and 2 are views, at right angles to each other, shewing the hood, shield,
or body, in the lowered position; and Figures 3 and 4 are similar views shewing
the hood, shield, or body, in its raised position.
A, is the hood, shield, or body, and B, is the part of the frame, or support, which
carries it. The hood, shield, or body A, is provided with flanges, or ribs, a, which
engage in grooves b, in the frame, or support, B, which is also shewn as being
provided, at bottom, with a groove 62 for receiving the lower edge of the hood,
shield, or body A when' in its lowered position. C, is a weighted catch pivoted at c
which, when the hood, shield, or body, is raised, is moved inwards by the
projection a², on the said hood, shield, or body, coming against the inclined part c²
and afterwards moves outwards, so that it supports the said hood, shield, or body,
by the projection a² resting on the said catch. By moving inwards the said catch
the hood, shield, or body, is released, and is lowered. The projection a constitutes
a thumb-piece, by which the hood, shield, or body, can be conveniently manipulated.
When the hood, shield, or body, is raised the lime-light jet, oil lamp, incandescent
gas-lamp, or other lighting device (an oil lamp D is shewn) is exposed for con-
venient manipulation and adjustment, and, when this has been done, the hood,
shield, or body, is lowered, and closes in the light completely. The hood, shield, or
body and other parts, may be of any convenient form, and the guiding arrange-
ments may consist of any engaging devices which will allow of the hood, shield, or
body, being raised and lowered as described ;-for example, it may consist of eyes,
on the one part, sliding along rods, on the other part.
Having now particularly described and ascertained the nature of this inven
tion and the manner in which the same is to be performed we declare that what we
claim is :-
:
1. An optical lantern, science lantern, or enlarging apparatus, provided with a
hood, shield, or body, which can be slidden, or moved, upwards for exposing the
lamp, or light giving device, and slidden, or moved, downwards, for closing in the
lamp, or light giving device.
2. An optical lantern, science lantern, or enlarging apparatus, provided with a
hood, shield, or body, which can be slidden, or moved, upwards, and downwards, as
described, and having an automatic catch for holding it in the raised position ;
substantially as herein before described.
3. The arrangement of sliding hood, shield, or body, and frame, or support,
therefor, and retaining device; substantially as hereinbefore described, and
illustrated in the accompanying drawings.
Dated this 18th-day of October 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents..