An Improved Apparatus for taking Photographs in Quick Succession and Projecting them on a Screen.
Year: 1896

page_text: Date of Application, 1st Aug., 1896
Complete Specification Left, 31st May, 1897-Accepted, 31st July, 1897
An Improved Apparatus for taking Photographs in Quick Succession
and Projecting them on a Screen.
GILBERT HOWARD HARRISON, Draughtsman, and THOS. JAMES HARRISON, Photographer
both of 10 Cherson Terrace Wood Green, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
A perforated sensitive film passing over a pin roller, behind a lens, on to a second
pin roller, & from thence to be wound on a spool worked by suitable mechanism; the
two pin rollers are geared together so as to move simultaneously and are given an
intermittent movement by means of a special device described below. The film in
passing over the pin rollers is given an intermittent motion synchronizing with the
revolutions of a shutter to expose the film during its period of rest, & to remain
closed during the passing of the film to its next position ready for the succeeding
exposure.
The accompanying drawing shows a section of the apparatus.
A and A¹ are the supply and seconding spools carrying the film, B and B are two
pin rollers, C and C are guide rollers D the shutter and E the lens, F is a toothed
wheel, having a convenient number of teeth, geared directly to pin rollers B & B',
G is a disc mounted at right angles engaging with toothed wheel F and having on
its surface a groove of the form shown in Fig. 2 from g² to gl it approaches the axis,
and from g¹ to g it remains radial with the same, so that when revolved one half a
revolution it slides tooth f up to f2 Fig. 1, and during the other half revolution, the
groove being radial with the axis, it causes F to remain at rest until the next tooth
engages in g, thus imparting to Fan intermittent movement.
Dated this 31st day of July 1896.
G. H. HARRISON.
THOS. J. HARRISON.
An Improved Apparatus for taking Photographs in Quick Succession
and Projecting them on a Screen.
We, GILBERT HOWARD HARRISON, Draughtsman, and THOMAS JAMES HARRISON,
Photographer, both of 10 Cherson Terrace, Wood Green, 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 consists in improvements in the means for giving an intermittent
movement to the films or ribbons of apparatus for taking or exhibiting photographs

page_text: Fig. 1 of the drawings filed with our Provisional Specification is a diagrammatic
vertical section representing an apparatus of the kind referred to provided with
means according to this invention for producing the requisite intermittent movement
of the film or ribbon.
In this apparatus in taking photographs in series, the film or ribbon is unwound
from a spool A by a roller or drum B provided at each side with a peripheral series
of radial pins that engage in corresponding holes in the edges of the film or
ribbon.
From the roller or drum B the film or ribbon is guided by rollers C and C¹ past a
shutter D which revolves behind a lens E so as alternately to cover and uncover the
latter. After passing round a second roller or drum B' of the same diameter as the
drum B and also provided with two sets of radial pins that engage in the aforesaid
holes in the film or ribbon, the film or ribbon is wound upon a spool A' which is
rotated by means of a spring or other suitable driving mechanism. The two pin-
drums B and B are connected together, by the three toothed wheels indicated in
dotted lines in Fig. 1, so as to move simultaneously, with equal velocities, and in the
same direction. To give the requisite intermittent movement to the drums B & B',
and thereby to the film, there is fixed on the axle of the intermedinte toothed wheel
a wheel F provided with a suitable number of teeth or pins of which there is always
at least one engaged in a groove or channel formed by ribs projecting from one
surface of a disc G. This disc, which is shown in elevation in Fig. 2, is mounted on
an axle at right angles to that of the pin-wheel F and is continuously rotated by hand
or by any suitable mechanism. The aforesaid groove or channel, from one end g to
the other g, subtends 360° at the axis of the disc G. The portion of the groove or
channel from g to gl subtending 180° at the axis of the disc G is coaxial with the
dise, but from gi to g the groove or channel gradually approaches the axis of the
disc, the distance between the ends g and g of the groove or channel being equal, or
approximately equal, to the radial distance between consecutive pins in the wheel F,
so that if, as shown in Fig. 1, two consecutive pins fl and f2 of the wheel F be simul-
taneously engaged in the two ends g and g' of the groove or channel and the disc G
be rotated in the direction, as seen from the left hand side of Fig. 1, opposite to
that of the hand of a watch, then during the first half revolution the wheel F will be
kept stationary as a consequence of the engagement of the pin in the portion g g¹
of the groove or channel, whereas during the second half revolution the pin f¹ will be
caused by the outer wall of the non-coaxial portion g' g² of the groove or channel to
move into the position shown as occupied by the pin . The shutter 1) is connected
by gearing to the disc G in such a manner that it will synchronize therewith so as
to expose the film or ribbon during its period of rest and to cover the lens E whilst
the film or ribbon is in motion.
It will be obvious that although we have shown the groove or channel so formed as
to make the periods of rest of the film equal in length to the periods of motion any
other desired ratio between the lengths of the periods of motion and the periods of
rest inay be secured by suitably deterinining the relation between the angle subtended
by the portion of the groove or channel that is coaxial with the disc and the angle
subtended by the portion thereof that is not coaxial therewith.
Means according to this invention for giving the required intermittent, movement
to the films or ribbons of apparatus for taking and exhibiting photographs in quick
succession present over the means for this purpose hitherto known to us, the
advantages of allowing the apparatus to be constructed in a more compact form and
enabling the changes from rest to motion and vice versa to be effected less abruptly
and backlash to be thereby avoided.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed we declare that
what we claim is :-
1. In an apparatus for taking or exhibiting photographs in quick succession, for
giving an intermittent movement to the film or ribbon the combination with film or

page_text: ribbon operating rollers or drums of a wheel provided with pins or teeth and a groove
or channel adapted to engage the successive pins or teeth and to be rotated about an
axis at right angles to that of the said wheel and comprising a portion having every
part equi-distant from its said axis of rotation and another portion that forms a
continuation of the first mentioned portion and gradually approaches the axis of
rotation of the groove or channel, the groove or channel subtending 360° at its axis
of rotation and the radial distance between its two ends being equal, or approximately
equal, to the distance between two consecutive pins or teeth of the said wheel,
substantially as herein before described.
2. In an apparatus for taking or exhibiting photographs in quick succession, means
for giving an intermittent movement to the film or ribbon, constructed, arranged, and
operating substantially as herein before described with reference to and shown in the
drawings.
Dated this 31st day of May 1897.
For the Applicants,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.