A New and Improved Acetylene Jet for Optical Lantern use.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
A New and Improved Acetylene Jet for Optical Lantern use.
FREDERICK SANSOM THORN, Gas Engineer, of No. 114, Vassall Road, North
Brixton, Surrey, and CHARLES HODDLE, Gas Engineer, of No. 84, Arthur Road,
North Brixton, Surrey, do hereby declare the nature of this invention to be as
follows:-
This invention has reference to an improved fitting for using Acetylene gas in
the Optical lantern. In our invention we employ a tray adapted to slide into the
ordinary grooves at inside bottom of lantern-to this tray we fix two upright pins
near the back end of tray parallel with the back of lantern, we also provide a bar
or bridge adapted to slide up and down the said pins and also set screws to fix bar
on said pins at any height. In the centre of said bar or bridge we attach a short
gas bracket terminating at back of lantern in a flexible tube stop-cock. At the
front end of bracket terminating inside the lantern we attach a
special burner
holder adapted to carry three burners in such a position that their flames are
presented to the condenser edgeways the middle burner being fixed lower than the
outer ones, the two outer burners are inclined inward towards the middle burner
which is upright. Also at a suitable distance from the burners we provide a
silvered parabolic reflector, this fitting has the advantage of being self centreing
and extremely easy to focus.
The th: 08th law of Tanuome 1807
F. S. THORN.
C. HODDLE.
A New and Improved Acetylene Jet for Optical Lantern use.
FREDERICK SANSOM THORN, Gas Engineer, of 114, Vassall Road and
CHARLES HODDLE, Gas Engineer, of 84, Arthur Road, both in the County of London,
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:
This invention relates to improvements in apparatus for using Acetylene gas in
the Optical Lantern or any Light Projector, and has for its object to provide
simple and efficient apparatus, whereby the best possible light is obtained for a
minimum consumption of Gas.
According to our invention, we provide a tray or base plate adapted to slide into
the ordinary grooves at inside bottom of Lantern or Projector. To this tray or

page_text: base-plate we fix two upright pins, either at right angles to, or parallel with, back of
Lantern or Projector. We also provide a bar or bridge, adapted to slide up or
down, on said pins and also set-screws to fix bar on said pins at any height. In
the centre of said bar or bridge we attach a short Gas-bracket, terminating at back
of Lantern in a flexible tube stop-cock.
At the front end of bracket terminating inside the Lantern or Projector, we
attach a special Burner holder, adapted to carry three burners, in such a position
that their flames are presented to the condenser of the Lantern or Projector edge-
ways. The middle burner being fixed lower than the outer ones. The two outer
burners are inclined inwards towards the middle burner, which is upright. Also
at a suitable distance from the burners, we provide a silvered, parabolic reflector.
In the accompanying drawings:-
Figure 1 is an elevation of apparatus constructed according to our invention.
Figure 2 is the horizontal section on the line hh.
Figure 3 is the vertical section on the line gg.
a is the tray or base plate. a¹, a² are the pins rivetted into tray or base plate a.
b is the sliding bar or bridge and bracket. 61 is the three burner holder.
c, c¹, c²
are the burners. is the reflector. e is the stop cock. e¹, e² are the set screws
for fixing sliding bar or bridge on to pins a¹, a. f is the channel by which the
Gas is conducted round the pins a¹, a².
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
1. Apparatus for using Acetylene Gas in Optical Lanterns or Projectors,
wherein a Base plate is employed having two, or more, upright Pins adapted to
receive sliding Bridge, substantially as described.
2. Apparatus for using Acetylene Gas in Optical Lanterns or Projectors,
wherein a burner holder is employed, adapted to carry Three Burners, the centre
burner being situated lower than the outer burners, which are presented at an
angle towards the centre burner, substantially as described.
3. The combination and arrangement of parts, forming the improved apparatus
for using Acetylene Gas, as herein before described and illustrated in the accom-
panying drawings.
Dated this 28th day of October 1897.
FREDERICK SANSOM THORN,
CHARLES HODDLE.