An Optical Toy, Applicable for Educational Purposes.
Year: 1889

page_text: Date of Application, 15th June, 1889
Complete Specification Left, 15th Mar., 1890-Accepted, 26th Apr:; 1890:
PROVISIONAL SPECIFICATION.
An Optical Toy, Applicable for Educational Purposes.
WILLIAM GUY 60 Lyndhurst Road, Peckham, London, S.E. Bookseller HABBY
STEVENS PERCY 207 Friern Road, East Dulwich, London S.E. Artist do hereby
declare the nature of this invention to be as follows:―
Two or more parti-coloured disks are mounted excentrically on a frame, each disk
being free to revolve on its own axis. Alternate rotary motion is communicated to
the frame by the torsion of a double cord. The rotary motion of the frame causes the
colours on the disks to combine-producing various colours. and tints; while each
reversal of this motion causes the disks to revolve on their own.axes and thus present
new combinations of colours. This invention is new in respect of the excentric
revolving disks, the alternate revolving of the frame and the arrangement of colours
on the disks...
i
WILLIAM GUY.
HARRY STEVENS PERCY.
COMPLETE SPECIFICATION.
An Optical Toy, Applicable for Educational Purposes.
WILLIAM GUY, Bookseller, 60 Lyndhurst Road, Peckham, London S.E. HABBY
STEVENS PERCY, Artist 207 Friern Road, East Dulwich, London, S.E. 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:-
Two or more parti-coloured disks are mounted excentrically on a frame, each disk
being free to revolve on its own axis.
Alternate rotary motion is communicated to the frame by the torsion of a double
cord.
The rotary motion of the frame causes the colours on the disks to combine→
producing various colours and tints; while each reversal of this motion causes the
disks to revolve on their own axes and thus present new combination of colours.
The disks which are made of cardboard, metal or other suitable material are
perforated in the centre and are coloured on one or both sides. These disks A. A.
Fig. 1. are carried by the frame B. which is preferably made of wire, each end being
bent into a hook C. C. Fig. 2; while the middle is formed into a loop D. Through
this loop D is passed from alternate sides the double cord which communicates the .
alternate rotary motion to the frame. To allow the removal of the disks and the
substitution of others differently coloured, the frame may be made as in Fig. 3 where
the frame terminates at E. E. and a spring piece F is provided. This spring piece is
connected with the frame at the centre, and at each end is formed the loops G G which
pass over the ends E. E. By pressing these ends downwards the disks A A may be
removed and others substituted. In this frame two loops D D are formed through
which the double cord passes.
Where three or more disks are used the frame is constructed with three or more
hooks radiating from the central loop D.
Alternate rotary motion is communicated to the frame by the twisting and untwisting
of a double cord of suitable length one end of which is held in each hand and which
is alternately pulled and relaxed. The frame is placed in the middle of this length of
cord.

page_text: To exhibit the greatest variety of tints and number of changes the disks are coloured
as in Fig. 4, but other arrangements of colour may be used; or, for educational
purposes, disks having each one different colour:-thus one blue disk and one yellow
will produce a green.
fv
:
Having now particularly described and ascertained the nature of our said Inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. The excentric disks which revolve on their axes on each reversal of the rotary
motion of the frame.
2. The double hook frame with central loop for connecting the cord.