The Ohio Democrat. (Logan, O. [Ohio]) 1886-1906, 1892-07-30
PICTURES BY TELEGRAPH.
A Recent Invention Which Is Said to BE
Practicable.

Practicable.
Among the most recent uses to which
electricity has been applied is that OF
transmitting photographs and draw
ings by wire.
The process is founded upon the use
of electricity of varying degrees of
strength, as in the telephone; or, in
other words, the movement of n certain
lever at one end of the line causes
corresponding lever to take the same
motion at the other end, similar to the
telegraph key The telephone is af-
fected by varying sound waves; the in
strument described is affected by the
varying degrees of light.
The process is as follows: A picture
is taken onSa film composed of gelatine
and bichromate of potassium, or the
picture may be taken in the ordinary
manner, and transferred to the sensi-
tive stripping film from the negative.
The film is then exposed to lukewarm
water. The portions which have not
been exposed to the light are washed
away, while the other parts are left.
For example, the dark parts of photo
graph represent the portion of film in
relief after washing, and the light parts
the parts washed away. The film,
therefore, has parts in relief, while
other parts are partially or entirely re-
moved. The film is now stripped from
the glass and placed upon a drum sim
liar to that used in the phonograph.
Bearing upon the cylinder is needle or
tracing point. The cylinder is set in
motion, and the needle travels over the
surface, or rather the surface travels
under the needle. The needle or stylus
rises and falls as the varying degrees of
elevation in the film pass under it, and
by so doing the amount of electric cur
rent transmitted to the receiving instru-
ment is regulated.
The entire success of the machine de-
pends upon the possibility of varying
the current as the elevations and de-
pressions vary in the film. This is at
tained by means of lever which is at
tached to the stylus or needle, which in
| turn actuates series of levers having
platinum points AS the stylus is raised
a greater or less degree the number of
levers depressed is increased or lessened
The receiving instrument is identical
| WIN inc lrdllSllllJIlliB lilhcAlluc, SNcepJ'
ing that craving tool is substituted
for the stylus on the transmitter. The
cylinder of the receiver is covered with
wax, which is turned down smooth.
The needle of the transmitter, as it
meets low point in the film, presses
upon number of levers, and degree
of current is sent over the wire, which
so affects the magnet of the receiver
that the craving point cuts deep
mark, and vice versa. The needle hav-
ing Travelled the full length of the pic
ture, it is removed from the cylinder
and carefully cut, spread out fiat, and
the picture appears in lines of different
depth.
The inventor claims to be able to re-
produces photos on papier mache that
may be used directly for printing, The
arrangement is such that by change
of gears reproductions of different sizes
may be made. Hand sketches may also
be sent in half-tone. The inventor also
claims that the depth of reproduction
can be increased one hundred per cent
above the greatest depth of the ordinary
hAif-to sketches Chicago Tribune.