Improvements in or relating to Optical Lantern Apparatus.
Year: 1894

page_text: Date of Application, 18th Apr., 1894
Complete Specification Left, 17th Jan., 1895-Accepted. 2nd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in or relating to Optical Lantern Apparatus.
1, BASIL BENTHAM DICKINSON of Bloxam House, Rugby, in the County of
Warwick, Gentleman do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to facilitate the adjustment of the light in an
optical or projection lantern, in order to avoid the use of the ordinary vertical rod
and clamping screw for effecting the raising or lowering of the light or jet, and to
facilitate the use of gas as a means of illumination.
A
I will describe one form of my invention in which gas is used, in connection
with a species of Bunsen burner and "mantle" of refractory earth, such as a
Welsbach incandescent burner.
This burner is carried on a metal rod or plate which is pivotted at one end to a
metal plate or tray, and at or near the other or rear end is supplied with a clamping
screw working in a slot in the said plate, or against the end of same.
means the light can be adjusted in a horizontal direction.
By this
In order to adjust the light vertically, attach the carrying plate or frame to a
second plate, frame or tray sliding on the bottom of the lantern, by means of metal
or other ties, levers or rods, pivotted or operating preferably at the sides of the
said plates. Through any convenient part of the upper plate I pass a finely
threaded screw, so that by turning this screw its end or point will press against the
under plate, and so raise the upper carrying plate and with it the light.
Instead of a screw, operating as above described, I may employ a cam or cone
in conjunction with a rod or lever by which to raise the light; or 'I may make use
of double levers or lazy-tongs as a means of connection of the two plates.
Side guides or flanges may be employed to assist in the relative movements of
the parts.
In order to enclose the amount of air admitted to the burner-when using an
incandescent gas-light-I provide a perforated metal ring over the air supply
openings, this ring being operated by a rod or lever from the side or back of the
lantern.
When using a lime-light jet or burner or saturator I prefer to pivot it, or its
carrier, nearer to the back in order that when moved to either side the light may
be moved as little as possible out of the axial centre line.
In some cases the tubes themselves of the jet may be utilised instead of a separate
upper plate or platform, the connecting rods being pivotted to the under plate and
the tubes of the jet or attachments thereto, and the screw working between
the tubes.
By means of a screw-rod passing through an arm or arms to the extremities of
which levers or rods are pivotted and which work against the upper and lower
plates, I am enabled to raise or lower the light or jet platform without altering its
position as regards distance from the condenser of the lantern.
Dated the 17th day of April 1894.
STANLEY G. S. DICKER,
Agent for Applicant.

page_text: refractory earth, such as a Welsbach incandescent burner.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation, showing my improved adjustable support or
with burner and shade attached.
Figure 2 is a plan view of same, with the burner and shade removed.
tray,"
Figure 3 is a front view of the removable shade and reflector, and supporting
frames.
66
The support or tray" consists of two frames a and b, the inner frame fitting
in the outer frame a, and being connected thereto by means of studs, ties or rivets
-as d-working in the inclined slots s in the outer frame (see Figure 1). The
inner frame is, in this construction, shorter than the outer frame a to allow for its
longitudinal displacement when elevating or lowering, as will be described. The
outer frame a is provided with a flange a¹ to engage in the usual guides in the
optical lantern body.
On the back of the inner frame band at the centre thereof on the inner side I
provide a bracket or pivotted bar k, to which is revolubly attached a screwed rod r
which passes through a vertical slot in the rear side of the outer frame a, thence
through a screw-threaded ball or part p which is pivotally connected to side
supports or bearings 9 secured to the frame, the screwed rod terminating in a
milled head m.
It will thus be seen that by revolving the rod r by means of the milled head m
the inner frame b will be either pushed forward or retracted, according to the
direction in which the rod is turned, and by reason of the pins d attached to the
inner frame, engaging in the slots s in the outer frame, the inner frame (and with
it the illuminant) will be caused to rise or fall; in this way the light can be centred
or adjusted in a vertical direction.
In order to provide for a lateral or horizontal adjustment of the light, I attach
the burner and gas tube or tubes t, to a metal bar t¹ pivotted at t to the inner
frame. Toward the other end of the bar t¹ I attach a clamping screw c which
works in a slot b¹ in the inner frame b. By this means the rod t, and with it the
illuminant, may be moved either to the right or left and secured in the desired
position by means of the clamping screw c, the burner being proportionately
moved in a similar direction.
e is the end of the tube to which the gas supply tube is attached, and u is the
tap by means of which the supply of gas to the burner is regulated.
A slot 6 is cut in the frame 6 in which the tube t may reciprocate, a similar
slot being provided for the base of the burner.

page_text: A shade 1 surrounding the burner on the two sides and back, and carrying a
reflector 2 is secured to the inner frame b by means of screws 3. 3, the back of the
shade carrying the reflector being hinged at 4.
Although I have shown and described my invention, as applied to an incandescent
gas burner, to which it is particularly adapted, I do not confine myself to that form
of illuminant, as with slight modifications in the method of attachment, a lime-light
jet, oil lamp or saturator may be attached to the inner carrying frame.
Instead of employing slots and studs or ties I may connect the inner and outer
frames by means of inclined rods or levers pivotally attached at their ends to the
said frames, the lower end of each tie being attached to, say, the outer frame, and
the upper end to the inner frame.
Instead of employing a somewhat horizontal rod r, as shown, for raising and
lowering the inner frame, I may attach the rod r and its bearing parts p and g to
the top of the inner frame b in any suitable part thereof, the other end of the rod r
bearing against the bottom of the frame a, or the floor of the lantern body. By
revolving the milled head m, the frame carrying the light will be raised or lowered,
as before described.
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 :-
:-
In optical lantern apparatus:
1. Two frames, connected by studs or projections on one engaging in inclined
slots in the other, substantially as and for the purpose described.
2. Two frames, connected by inclined levers, the top ends of the levers being
pivotted to one frame and the lower ends of the levers being pivotally connected
to the other frame, substantially as and for the purpose described.
3. The combination and use of a screwed rod r, such as described, and its
attached parts, with the two connected frames, as described in the two preceding
claims, substantially as set forth.
4. The combination and use of a gas burner with carrying frames, and means of
raising and lowering same, substantially as set forth.
5. The combination and use of means of adjusting the position of the light in a
horizontal direction substantially as set forth.
6. The combination and use of a gas burner, tube t, bar t', clamping screw c,
frames a and b, and operating screw r, substantially as shown and described.
Dated the 17th day of January 1895.
STANLEY G. S. DICKER,
Agent for Applicant.