Improved Apparatus for Photographically Recording Oscillating Rays of Light.
Year: 1899

page_text: Date of Application, 13th Nov., 1899-Accepted, 17th Feb., 1900
COMPLETE SPECIFICATION.
Improved Apparatus for Photographically Recording Oscillating Rays
of Light.
We, ANTON POLLAK, of 45, Elisabethring, Hotel Royal, JOSEF VIRÁG, of
19, Elisabethring, GYULA EGGER, of 7, Huszárutza, all of Buda Pesth, VII., in
the Kingdom of Hungary, and Dr. FREDRICH SILBERSTELN, of 5, Vorlaufstrasse,
Vienna, I., in the Empire of Austria, Electrician, Mechanical Engineer, Director
and Lawyer respectively, 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 has for its object a photographic registering apparatus for
recording oscillating movements on an endless strip, in such a way that the
curves of oscillation are indicated in parallel rows at right angles to the direction
of movement of the sensitive strip.
In the accompanying drawings,
Figure 1 shows the apparatus in side view partly in section on the line E F
of Figure 2;
Figure 2 in its upper half is a section on the line A B of Figure 1, and
its lower half is a section on the line CD of Figure 1.
1 is a source of light of any suitable kind from which a group of light rays
falls through a narrow elongated slit 2 on to a concave mirror 3. This concave
mirror is connected with the movable body, the oscillations of which are to be
recorded, in such a way that this mirror by reason of this connection executes
oscillating movements on an axis which is parallel to the slit 2 before mentioned.
In the case shown in the drawing the mirror is connected with the diaphragm
of a telephone for instance or a telegraphic receiver such as described in
Patent No. 6932 of 1899.
The oscillating movements of the concave mirror impart oscillating movements
to the reflected light rays 4 also, so that at the point 5 an actual oscillating
picture of the slit 2 results, which is recorded by the devices hereinafter
described.
An endless band 8 is carried over rollers (5, and 7. This baud 8 is provided
with openings at equal distances apart, in front of which openings a cylindrical
lens 9 is fastened on the band in such a way that the geometrical axes of
these cylindrical lenses 9 stand at right angles to the direction of the movement.
The roller receives a rotary motion from a driving mechanism, such for
instance as a clockwork 10 so that the band 8 is moved forward in the direction
indicated by the arrow. The cylindrical lens for the time being between the
two rollers and allows separate parts of the group 4 of reflected rays to pass
through the lens as it moves from the roller to the roller 6¹. The focal
distance of the cylindrical lens 9 is so calculated that the part of the light
rays
4 which is absorbed by the lens is also concentrated at 5 into an intense
point of light. An endless sensitive strip of paper is slowly moved forward
by mean of rollers 11 and 12 in the direction indicated by the arrow in such a
way that the said intense point of light falls on the sensitive strip.

page_text: Of course care must be taken that the sensitive paper is entirely secluded from
all foreign light in a box 15 which perfectly excludes light, and it is collected
after the exposure in a receiver 13 from which the light is also excluded.
A red observation glass 14 may be arranged in the box 15 behind the paper
strip in order that the oscillations of the point of light during the exposure
may be inspected.
The distance of the separate lenses 9 on the endless band 8 is exactly as
great or somewhat smaller than the width of the sensitive strip 16.
The working of the whole apparatus is as follows:-
For the purpose of recording the oscillating ray of light 4, the driving
mechanism, which moves forward the endless band 8 and the strip 16 in the
direction indicated, is started. The optical arrangement herein before described
produces on the sensitive paper a sharp point of light, which, in consequence
of the oscillations of the mirror 3, oscillates in a vertical direction, but in
consequence of the movement of the cylindrical lenses 9 executes a continuous
horizontal movement. As soon as one lens 9 has passed in front of the
sensitive strip 16 or somewhat before that time, the following lens comes into
action and conveys the oscillating point of light again transversely over the
paper strip 16. As however in the meantime the sensitive strip 10 has also
moved a given distance in a direction at right angles to the direction of move-
ment of the endless band 8, the following oscillation curve will encounter the
sensitive strip at a distance from the previous curve of oscillation corresponding
to the difference in the movement executed. The developing and fixing of the
exposed sensitive strip takes place in the ordinary manner.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. An apparatus for photographically recording oscillating rays of light
characterised by a series of cylindrical lenses passing transversely and constantly
over a sensitive strip which is moved forward, which lenses concentrate the
oscillating ray of light on the sensitive strip in such a way that the oscillations
of the ray of light are not affected, whilst the concentrated ray of light, in
consequence of the movement of the cylindrical lenses, is carried transversely
over the sensitive paper and is registered in parallel cross rows on the same
in consequence of the movement of the sensitive strip, substantially as herein-
before set forth.
2. The general construction and combination of parts taken as a whole forming
the improved apparatus for photographically recording oscillating rays of light,
substantially as herein before described and illustrated.
Dated this 10th day of November 1899.
W. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.