Improvements in Magic Lanterns or Stereopticons.
Year: 1889

page_text: ate of Application, 17th Sept., 1889-Accepted, 2nd Nov., 1889
Place, New York City, United States of America, Manufacturer.)
Improvements in Magic Lanterns or Stereopticons.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex 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 magic lanterns or stereopticons and consists of a lantern
constructed in the manner and for the purpose herein after described and shown in
the accompanying drawing in which
Figure 1 is a side elevation of my lantern.
Figure 2 a vertical section of the reflector.
Figure 3 a rear view of the hood of the reflector detached from its support.
Similar letters of reference indicate like parts in the several views.
This invention relates more particularly to the construction, combination and
arrangement of the reflector of a lantern designed for stereopticon purposes and
projecting pictures.
To increase the brilliancy of the light in a magic lantern is to render the difinition
of the lantern much more satisfactory, and to increase the brilliancy without
necessarily resorting to the oxy-hydrogen burners, and without also increasing the
heat of the light to a degree that would be injurious to a lantern, is a problem
that manufacturers of stereopticon lanterns have been endeavouring to solve for
many years.
For the purpose of arriving at a result that will nearly or quite accomplish all
that is required in this connection I aflix or apply to the lamp A of my stereopticon,
a reflector B, which is as nearly as may be parabolic in form, which form as is well
known yields the best results when used in a reflector. This reflector of the form
described is mounted upon the lamp A of any suitable construction, but to give a
satisfactory result the flame from this lamp must be relatively of large proportions
and therefore send out a high degree of heat and this heat, if allowed to pass freely
and unobstructed from the face of the reflector would in time warp the metal of
the lamp and in somo instances fracture the condensing lenses a.
To maintain the bright light without injury from its heat I provide my reflector B
with a hood C. This hood is binged or otherwise fixed to the reflector so that it
fits over its faco. The hood is made of metal, and it is in form a truncated
cone with angular sides b, and with its face or front side fitted with a
window c.
It is found in practice that the reflector B when fitted with the hood above
described permits a large and brilliant light to be used without injury to any part
of the apparatus from the heat of the lamp since, as the heat is generated, it is
retained within the chamber formed by the reflector and hood, until it passes off
through the chimney d.
By this construction and combination of my reflector and hood it is possible to
burn oil lamps of great flame and brilliancy in a stereopticon lantern, as well as,
if desired, the ordinary lime light. The chimney d is made of metal and attached
to the reflector, and the burner case e of the lamp passes into and is also attached
to the reflector.
Another improvement in connection with the reflector and lamp consists in
inserting the burner of the lamp A in the reflector B so that the flame sball
be in the same vertical line or coincident with the opening in the reflector for the
chimney d, causing the current through the chimney to be sufficient to supply the
[Poice 1

page_text: burner with the necessary air, which passes up through and around the burner, for
sustaining combustion, and also to carry off through the chimney the smoke etc.
By this arrangement of lamp, reflector and chimney I am able to do away with
a glass chimney surrounding the flame, which robs the light of brilliancy, especially
when the chimney is smoked, to say nothing of the inconvenience arising from the
fracture of the glass, and besides, such a chimney always casts a more or less
distinct shadow upon the screen.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what
claim is:-
―:.
The combination of the lamp; the parabolic reflector, having the chimney d
secured to one side and a burner case to the opposite side and the hood C, having
the window the burner of the lamp being received within the burner case, by
which the reflector is supported, and the reflector and hood constituting the combus-
tion chamber; substantially as and for the purpose described.
Dated this 17th day of September 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.