Year: 1894

page_text: Date of Application, 20th Dec., 1894-Accepted, 26th Jan., 1895
I, Willem GelDOLPH GROTTENDIECK of 26, Laan von Meerdervoort, The
Hague, Holland, 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 :-
The present invention relates to a novel stereoscopic magic lantern apparatus
or arrangement of magic lanterns to show views stereoscopically i.e. by applying
the idea on which stereoscopes are based to a number of magic lanterns and
advantageously with the aid of coloured glasses in said lanterns.
The accompanying drawing illustrates-diagrammatically in plan-an arrange-
ment of this kind.
The pictures or views to be projected are made in a similar manner to those for
stereoscopes or stereoscopic viewing apparatus that is to say they are representations
or views of one and the same object from two different points.
The two pictures are inserted into the magic lanterns each of which is or may be
provided at its forward end with devices for allowing the light to issue coloured.
The angles of projection of these two magic lanterns a (it is obvious that their
number may if desired be increased for the purpose of heightening the effect) are
adjusted with reference to one another in such a manner as to cause the two pictures
to coincide together on the surface of projection b. For colouring the light
complementary colours are advantageously selected in such a manner that the
pictures represented on 6 (which are observed through a special viewing device c)
shall appear as far as possible in their natural colours. The viewing device is
advantageously made of glass but may also be made of gelatine coloured liquid or
other similar materials or otherwise suitably arranged.
It is to be noted that the left hand picture should be projected with the colour
which is shown by the view apparatus that is in front of the left eye, and so on for
the other eye.
By this means the eye of the observer receives a curious and realistic impression
of the object represented.
The constructional arrangement of the whole apparatus is of course capable of
the most varied execution that is to say the invention is capable of being carried
into practice in a variety of ways.
Thus for instance the viewing device may consist of a simple pair of spectacles.
It may however also be that the viewing holes of a box or case enclosing the
entire apparatus are so arranged that the observer on approaching the box can see
nothing except the two coloured glasses through which it is intended he should
look. The entire remaining portion of the apparatus can then be arranged in a
suitable manner inside the box.
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 :-
1. The employment of two or more magic lanterns arranged in combination and
acting in conjunction with stereoscopically arranged magic lantern slides or views
to produce stereoscopic-like effects substantially in the manner hereinbefore set
forth

page_text: 2. A stereoscopically acting magic lantern apparatus arranged combined and
acting substantially in the manner and for the purpose herein before described and
illustrated in the drawings hereunto annexed.
Dated this 20th day of December 1894.
TONGUE & BIRKBECK,
Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.