Improvements in so-called Revolving Changing Pictures.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in so-called Revolving Changing Pictures.
I, ERNEST ROBERT NISTER, of the Firm of Ernest Nister, of 24, Saint Bride
Street, in the City of London, Publisher, do hereby declare the nature of this
invention to be as follows;
-
Heretofore in the so-called revolving changing pictures two rotatable circular
cards were used having two different pictures applied thereto and these cards
were formed with radial slits reaching nearly to the centre the sections or leaves
thus formed in many cases overlapping each other to a certain extent for the
purpose of preventing the edges of the sections in one card catching against the
edges of the sections in the other card when being rotated; moreover there
was, in such cases, a certain amount of extra work in the production because the
pictures had to be continued somewhat on the parts beyond the slits.
Now according to my invention I make the slits tangential to a small circle
in the centre and provide suitable means for guiding the motion of one card
against the other. In one arrangement I make one of the sections in one of
the cards with a central part circular extension or tongue and form the other
sections of that card with corresponding part circular notches which fit round
the tongue. The other card has merely slits cut tangentially to a small central
The two cards are
circle and reaching to within a short distance of the centre.
united by a central pin or pivot.
Revolving pictures of this kind may be bound in a book or used singly.
2000
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.
Improvements in so-called Revolving Changing Pictures.
I, ERNEST ROBERT NISTER, of the Firm of Ernest Nister, of 24, Saint Bride
Street, in the City of London, Publisher, 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:-
Heretofore in the so-called revolving changing pictures two rotatable circular
cards were used having two different pictures applied thereto, and these cards
were formed with radial slits reaching nearly to the centre, the sections or leaves
thus formed in many cases overlapping each other to a certain extent for the

page_text: purpose of preventing the edges of the sections in one card catching against the
edges of the sections in the other card when being rotated; moreover there
was in such cases a certain amount of extra work in the production because the
pictures had to be continued somewhat on the parts beyond the slits.
Now according to my invention I make the slits tangential to a small circle
in the centre and provide suitable means for guiding or limiting the motion of
one card against the other.
In the accompanying drawings I shew one arrangement, Fig. 1 representing
one card, the lower, and Fig. 2 the other card, the upper; Fig. 3 is a central
star-shaped piece which is glued to the lower card and which covers a central
pin or pivot. The card A, Fig. 1, is formed with slits a that are tangential to a
small circle indicated by a dotted line. One of the sections thus produced is
made with a central part circular extension or tongue e and the other sections
of the card are formed with corresponding part circular notches which fit
round the tongue c. The dotted chain lines in Fig. 1 shew the outline of the
picture or design. The other card B, Fig. 2, has merely slits e cut tangentially
to a small central circle bindicated by a dotted line and reaching to within a
short distance of the card. The two cards are united by a central pin or pivot
which may be covered by the star shaped piece, Fig. 3. The two cards having
been placed one on the top of the other are united centrally as described, and
assume in an intermediate position the form shewn in Fig. 4. Fig. 5 shews
the back of the device corresponding to Fig. 4; the motion is limited by the
edges of the sections in one card coming against the central termination of the
slits in the other card; f is a short tag fixed to the outer card, Fig. 2, for taking
hold thereof and pulling it round.
Revolving pictures of this kind may be bound in a book or used singly.
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
1 claim is:
--
(1). In so called revolving changing pictures making the slits in the two
cards tangential to a comparatively small central circle, substantially as set
forth.
(2). The construction of revolving changing pictures as firstly claimed in which
the motion of one card against the other is limited by the edges of the sections
in one card coming against the terminations of the slits near the centre in the
other card, as described with reference to the drawings.
Dated this 24th day of February 1900
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.