IMPROVE- MENTS IN THE MEANS AND APPARATUS FOR RECORDING ELECTRIC TELEGRAPI! SIGNALS
Year: 1877

page_text: LETTERS PATENT to Carl Heinrich Siemens, of No. 12, Queen Anne's Gate,
Westminster, in the County of Middlesex, for the Invention of "IMPROVE-
MENTS IN THE MEANS AND APPARATUS FOR RECORDING ELECTRIC TELEGRAPI!
SIGNALS." A communication from abroad by Dr. Ernst Werner Siemens,
of Berlin, in the German Empire.
led the 8th September 1877, and dated the 14th May 1877.
PROVISIONAL SPECIFICATION left by the said Carl Heinrich Siemens at
the Office of the Commissioners of Patents on the 14th May 1877.
CARL HEINRICH SIEMENS, of No. 12, Queen Anne's Gate, Westminster, in the
County of Middlesex. "IMPROVEMENTS IN THE MEANS AND APPARATUS FOR
RECORDING ELECTRIC TELEGRAPH SIGNALS." A communication from abroad by
Dr. Ernst Werner Siemens, of Berlin, in the German Empire.
The present Invention relates to that description of recording instruments wherein
a style or tracing point is made to trace a continuous straight line on a paper strip
so long as there is no current passing through the line, but is made to deviate to
the one side or the other of that line, according as a positive or a negative current is
passed.
According to the present Invention the paper strip has its surface on which the
style acts blackened with finely divided carbonaceous matter, such as that deposited
from smoke, so that as it is passed under the style the point of the latter, by
removing the carbon along its line of contact, produces a white line (or of the same
colour as the paper) on the blackened paper. For the purpose of blackening the
paper it is passed over a smoking flame, and to prevent it from being ignited or
charred, it is, during its passage over the flame, kept in close contact with a cylinder
of metal or other good conductor of heat.
In order to fix the carbon coating on the paper strip after the line or signal has
been traced thereon, so as to render the record permanent, the paper strip is treated
with alcohol, ether, or other liquid, it being for this purpose passed under a cylinder
which dips into a bath of such liquid.
It is preferred to dissolve some resinous or glutinous substance in the said liquid
in order more effectually to fix the carbon coating, and in order to accelerate the

page_text: drying of the paper strip; aſter it has been so treated it may be passed over a wire
gauze or other surface heated by a flame.
The movements of the style may be produced in any known manner.
It may,
for example, be attached to the tongue of a relay, or to a coil suspended in a circular
magnetic field. In employing the tongue of a relay, which is held in the position
of quiescence by a spring, it is preferred to make the spring of such a kind that as
the tongue is moved the force of the spring resisting it increases more rapidly than
the force tending to move it.. This can be effected by attaching the tongue to the
middle of a stretched steel wire or other elastic spring, the resisting force of which
can be regulated by varying its length and tension.
When the style is moved by a coil in a circular magnetic field, it is preferred, for
the sake of lightness, to make the coil of aluminium, which is suspended by a spiral
spring, and in order to bring the coil rapidly back to the position of rest, and to
prevent its lateral oscillations, elastic strings are stretched horizontally through the
point at which the coil is attached to the spring, these strings serving as conductors
for the coil.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by.
the said Carl Heinrich Siemens in the Great Seal Patent Office on the 13th
November 1877.
CARL HEINRICH SIEMENS, of No. 12, Queen Anne's Gate, Westminster, in the
County of Middlesex. "IMPROVEMENTS IN THE MEANS AND APPARATUS FOR
RECORDING ELECTRIC TELEGRAPH SIGNALS." A communication from abroad by
Dr. Ernst Werner Siemens, of Berlin, in the German Empire.
The present Invention relates to that description of recording instruments wherein
n style or tracing point is made to trace a continuous straight line on a paper strip
so long as there is no current -passing through the line, but is made to deviate to
the one side or the other of that line according as a positive or a negativo current
is passed.
According to the present Invention the paper strip has its surface on which the
style acts blackened with finely divided carbonaceous matter, such as that deposited
from smoke, so that as it is passed under the style the point of the latter, by
removing the carbon along its line of contact, produces a white line (or of the same
colour as the paper) on the blackened paper. For the purpose of blacking the
paper it is passed over a smoking flame, and to prevent it from being ignited or
charred, it is, during its passage over the flamme, kept in close contact with a cylinder
of metal or other good conductor of heat.
In order to fix the carbon coating on the paper strip after the line or signal has
been traced thereon, so as to render the record permanent, the paper strip is treated
with alcohol, ether, or other liquid, it being for this purpose passed under a cylinder
which dips into a bath of such liquid.
It is preferred to dissolve some resinous or glutinous substance in the said liquid
in order more effectually to fix the carbon coating; and in order to accelerate the
drying of the paper strip after it has been so treated, it may be passed over a wire
gauze or other surface heated by a flame.
It may,
The movements of the style may be produced in any known manner.
for example, be attached to the tongue of a relay, or to a coil suspended in a circular
magnetic field.
When the style is moved by a coil in a circular magnetic field, it is preferred, for
the sake of lightness, to make the coil of aluminium, which is suspended by a spiral
spring, and in order to bring the coil rapidly back to the position of rest, and to
prevent its lateral oscillations, elastic strings are stretched horizontally through the
point at which the coil is attached to the spring, these strings serving as conductors
for the coil.

page_text: DESCRIPTION OF THE DRAWINGS.
Fig. 1 represents a side view, and Fig. 2a plan of telegraphic receiving apparatus,
according to this Invention.
Fig. 3 represents diagrammatically the course of the paper strip through the
apparatus. A is the reel whence the continuous paper strip B is drawn by the
ordinary clockwork C. The paper B in its course from the reel A first passes over
the smoking flame of a lamp D, above which is mounted the metal roller E, to
prevent the over heating and scorching of the paper. The paper then is led over a
roller F, between it and the tracing style G, which is attached to a bobbin H,
preferably of aluminium wire, suspended in an annular magnetic field by a helical
spring.
In order to centre and steady the bobbin, two cross wires K, K, stretched by
adjusting screws, are attached to it, and these wires serve as conductors. When
electric impulses are transmitted through these and the coil of the bobbin, the latter
is caused to move upwards or downwards in the magnetic field, and the tracing
point G attached to it marks on the blackened paper B a wave line. From the
roller E the paper is led under a roller through a vessel L (Fig. 3) containing
fixing liquid, which vessel is kept charged by a fountain glass M. The paper
having been thus moistened is dried by being passed over the flame P of a lamp,
between which and the paper there is a screen 2 of wire gauze.
Although the movement of the tracing style G has been described to be effected
by the. action of a bobbin in an annular magnetic field, it is obvious that, the
apparatus generally remaining as described, other known means of giving the
tracing style up-and-down movement in obedience to electric impulses might be
employed.
Having thus described the nature of this Invention, and in what manner the
same is to be performed, as communicated to me by my foreign correspondent,
I claim,
First. Recording electric telegraph signals by means of moving paper strip, which
in its continuous course is successively blackened by smoke, traced on by an
electrically moved style moistened and dried, substantially as herein described.
Second. The use for recording telegraph signals in the manner above referred to,
of apparatus consisting of the ordinary paper moving apparatus of receiving instru-.
ments, combined with a lamp to blacken the paper, an electrically moved style to
trace thereon, a liquid bath to fix the marking, and a lamp to effect the drying,
substantially as herein described.
Third. Moving the tracing style of apparatus such as is referred to in the pre-
ceding claim by means of a coil suspended in a magnetic fluid, and centred and
steadied by stretched conducting wires, substantially as herein described.
In witness whereof, I, the said Carl Heinrich Siemens, have hereunto set my
hand and seal, this Twelfth day of November, in the year of our Lord
One thousand eight hundred and seventy-seven.
AIDT TRIINTAT
ATK
CARL HEINRICH SIEMENS. (LS.)