Improved Graphoscope for Obtaining Stereoscopic Effects.
Year: 1898

page_text: Date of Application, 12th July, 1898-Accepted, 27th Aug.,
1898
COMPLETE SPECIFICATION.
Improved Graphoscope for Obtaining Stereoscopic Effects.
I, HENRY HARRISON HILL, of 261, Ashland Boulevard, Chicago, Cook County,
Illinois, United States of America, Manufacturer, do hereby declare the nature
of this invention, and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement:-
The object of my invention is to make a binocular optical instrument, in which
but one picture is needed instead of two, as in the ordinary stereoscope; and my
invention consists in the features and details of construction hereinafter described
and claimed.
In the drawings, Figure 1 is a perspective view of my improved optical instru-
ment; Fig. 2 a perspective view of the picture-holding wires; Fig.
a sectional
plan view, taken through Fig. 1; and Fig. 4 a sectional plan view of a modified
form of the instrument.
In making my improved optical instrument, by which the stereoscopic effect is
to be obtained by the use of a single picture instead of a double one, I make a
case A, which may be of any desired material. This case is provided with two
viewing tubes B and B', arranged a proper distance apart to suit the which
eyes,
will usually be about two and a half inches. At the inner end of these viewing
As shown in
tubes are arranged lenses 6 and 1, of the ordinary construction.
Figs. 1 and 3, these viewing tubes are arranged at one side of the case of the
instrument. The case should also be provided with a handle C to enable a user
to easily hold it in position. Within the case in the form shown in Figs. 1 and
3-I arrange two mirrors D and D set at such angles as that the rays of light
from the picture to be viewed will strike the mirrors and be reflected, respectively,
through the lenses 6 and bon parallel lines to the eyes of the beholder. To
support and hold the picture in place to be viewed, I arrange picture-holding
wires E. These wires are preferably formed of a single piece of spring wire,
attached to the case by a screw e and passing through staples e', which serve to
hold them in proper position, while at the same time permitting the free ends of
the wires to be sprung apart to accommodate pictures of different sizes. The free
ends of the wires are bent into loops 2 adapted to receive and embrace the ends of
the card on which the picture is mounted. The rays of light from the center of
the picture pass to the mirrors D and D¹, whence they are reflected through the
lenses and to the eyes of the beholder, as represented by dotted lines in Fig. 3.
This causes two images of the single picture to be produced in the mirrors and to
be transmitted from the mirrors to the eyes of the beholder, so that the impression
of a single perspective view is created.
In Fig. 4 I have arranged the viewing tubes opposite the picture, and two re-
fracting prisms F and F are placed in front thereof. The rays of light from the
picture to be viewed striking these prisms will be refracted and transmitted
through the lenses to the eyes of the beholder, as shown in dotted lines. In this
way two images are obtained from a single picture, which being transmitted to
the eyes of the beholder on parallel lines have the appearance of a single picture,

page_text: the practical effect being that a perspective impression is obtained by the use of
a single picture instead of a double one.
Some of the advantages of my invention are that it is simple and economical
in construction, and that it provides an instrument adapted for viewing single
pictures of different sizes.
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. In an optical instrument, the combination of a case, viewing tubes, and
means in the case for transmitting to the eye of the beholder double images of a
single picture, substantially as described.
2. In an optical instrument, the combination of a case, viewing tubes, and
reflecting mirrors in the case for transmitting to the eyes of the beholder double
images of a single picture, substantially as described.
3. In an optical instrument, two lenses and two mirrors, the mirrors being
placed at angles to the lenses, respectively, for forming a double image from a
single picture and thus creating a perspective impression on the beholder, sub-
stantially as described.
4. In an optical instrument, the combination of a case, and lenses and refract-
ing prisms in the case, substantially as described.
5. In an optical instrument, the combination of a case, viewing tubes, and
refracting prisms in the case, substantially as described.
6. In an optical instrument, the combination of a case, viewing tubes, lenses
in the viewing tubes, and two refracting prisms in the case, substantially as
described.
Datad Th
1
T
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.