Improvements in Apparatus for Photographing by Means of Gas and Electric Light.
Year: 1899

page_text: Date of Application, 30th Aug., 1899-Accepted, 4th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Apparatus for Photographing by Means of Gas and
Electric Light.
I, ANDREW GEORGE ADAMSON, of Dashwood House, 9, New Broad Street,
London, Electrical Engineer, 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 relates to improvements in apparatus for photographing by
means of gas.
Owing to the large volume of gas required to give a sufficiency of light to
photograph even when using incandescent burners, it has hitherto been always
necessary to provide a special service supply main, where one did not already
exist, and, as most studios are to be found on the tops of buildings, the trouble
and expense attending the way-leave through that part of the building not
occupied by the photographer, and the execution of the work has operated to
prevent the introduction of gas in any general way for this purpose.
In order that my invention may be properly understood and readily carried
into effect I have hereunto appended one sheets of drawings, of which,
Figure 1 is a sectional elevation of the whole apparatus.
Figure 2 is plan of the underpart of the stand showing relative position of the
brackets and the manner in which they are attached to the supporting forks, also
position of the box and the slot in its upper surface.
Figure 3 is sectional elevation of valve tube and its connection.
Figure 4 is plan of beam and counterweight.
Figure 5 is section shewing connection of flexible tube with upright.
Figure 6 is section shewing construction of reflector.
In carrying out my invention I provide a stand composed of three brackets L
and which is attached to a central upright tube A by means of two supporting
forks J, one being at top of brackets I. and the other at the bottom. The tube A
is tapped a few inches of its length at the bottom and the bottom supporting fork
is secured in its place by means of two lock-nuts a. The three brackets L are for
convenience of moving mounted upon castors. At the top of the central tube A
there is a collar N, which slips over the end of the tube and is supported at the
top by an inner projecting flange b. From opposite sides of the collar N are
projected two studs upon which is supported and pivoted the beam 0 and
counterweight Y. The beam O is constructed partly of wood and partly of iron,
but it may be constructed of any other suitable metal or material. From the
point of the long end of the beam O is suspended on a pivot O¹ a ball and socket
joint R to which is attached a bent tube Z. This bent tube is adjusted to
support a series of gas burners (or one burner as the case may be) adjusted in
any convenient form but being arranged in such a manner as to put their general
position as nearly as possible in the focus of a parabolic reflector S of suitable
size. The reflector S is supported by a metal or other support, such as that.
indicated at Q. This support is bound between the joints of the head of the
tube Z and the under part of the ball and socket joint R. In order to convey

page_text: canvas by placing around the periphery a wooden ring shaped on its upper edge.
The cloth having been immersed in any suitable fluid to render it fire-proof, is
laid across the mould and stretched in all directions until all creases or folds are
removed and held in place in any suitable manner, then whilst still wet paper
in sheets is pasted or otherwise fixed over its entire surface. (This paper having
been previously expanded by damping).
Another sheet of cloth is similarly
treated and stretched over the layer of paper, (the paper having been coated on
its outer surface with paste or other adhesive substance to receive the cloth).
Then the second cloth is covered with paper as before. Then cloth as before
until the desired thickness of material is produced, when either heat is applied
or the mass is left to dry spontaneously. When dry all the material is cut
neatly round by the under edge of the wood ring, except the outer layer of cloth,
this is retained until the reflector is taken off the mould, it is then drawn inside
and secured in any suitable way to the inside of the wood ring, thus securing the
whole of the material to the ring which supports it at its outer edge. Figure 6
more clearly shows the construction of the reflector. V is the wood supporting
ring on the outer rim of the reflector whilst 1, 2, 3, 4, and 5 are respectively
alternate layers of cloth and paper. It will be observed that the layer of cloth 5
which is the outside one envelopes the whole and is brought round to the inside
of V and secured by any convenient method such as gluing or pasting, etc. The
cloth and paper are respectively chosen with a view to their respective properties
of expansion and contraction when wet and when dry.
It is to be understood that the reflector as described may also be used for
electric are lighting.
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:-
-
1. The apparatus for photographing by means of gas constructed and operating
substantially as and for the purposes hereinbefore described and illustrated on the
accompanying sheet of drawings.
2. In apparatus for photographing by means of gas, or electric light the con-
struction of reflector or chamber, substantially as described and illustrated on the
accompanying sheet of drawings.
Dated this 20th day of
1000
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Patent Agents.