Improvements in Receiving Apparatus for Hertzian Radiations or Electro-magnetic Waves.
Year: 1899

page_text: Date of Application, 24th Nov., 1899- Accepted, 25th Aug., 1900
COMPLETE SPECIFICATION.
Improvements in Receiving Apparatus for Hertzian Radiations or
Electro-magnetic Waves.
I, JULIO CERVERA BAVIERA, of 22, Roa Lauria, Valencia, Spain, Officer of
Engineers in the Spanish Army, 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:
My invention relates to a new or improved receiver for Hertzian radiations
or electro-magnetic waves by means of which certain advantages are obtained.
In order that the invention may be readily understood I shall proceed to
describe it with reference to the accompanying drawings.
Referring to Figure 1, A is an electro-magnet with reciprocating armature B.
At the extremity of this armature lever is a carrier C of ivory, ebonite or
other non-conducting material. In the said carrier, which may be of spherical,
shape, is a small cavity d within which is placed a coherer. The two terminals"
of the coherer are respectively connected one by the lead e leading to the ver-
tical wire f, the other by the lead y connected to earth at h. In addition the
terminals of the coherer are connected through the small resistances i, j with
the relay and with the local battery m. The coil of the electro-magnet A is
in a shunt circuit from the said relay.
When the Hertzian or electro-magnetic waves impinge upon the coherer the
circuit through the local battery m is closed, the relay actuated and the electro-
magnet A caused to attract its armature B. This will cause the carrier C con-
taining the coherer to strike against the head of the adjustable screw n so as
to cause de-coherence of the filings of the coherer and prepare the latter for
receiving the next signal or transmission. This arrangement for de-coherence
is very advantageous in practice.
In applying the invention to wireless telegraphy I may substitute the electro-
magnet of a Morse recorder for the electro-magnet A of Figure 1 and for the
lever of such a Morse instrument I substitute an armature lever bearing the
carrier and coherer as is shown in Figure 2. In this manner the same lever C₁ B¹
will register the signs (dots and dashes) on the slip P as will be readily under-
stood.
By the means above described a convenient form of sounder may also be
obtained as the messages can be read by the audible striking of the carrier C
on the head of the screw n.
.
I have hereinbefore described what I may term the reciprocating form of my
invention but I have also devised a rotary form, the said rotary form being shown.
in Figures 3 and 4. In these Figures, Q is a small electro-motor fed by an
accumulator, or other source of electrical energy R, S being a rheostat for the
purpose of regulating the action of the motor. On the axle of the electro-
motor is fixed a cylindrical carrier T in the interior of which is the coherer u
whose poles terminate in two metame contacts, communicating alternately
with the brushes 1,1, the said brushes being connected to earth and to the

page_text: vertical wire respectively and also to the relay and local battery as shown in
Figure 4. When the electro-motor is rotating the coherer turns with it at a
given speed determined for each case so that by means of the contacts, a, and
brushes,, the circuit is closed and opened a given number of times per
second according as may be required to correspond with the signals or undula-
tions received from the transmitting station.
By the means described the employment, as is usual, of a separate vibrator is
rendered unnecessary, the decoherence being brought about in the case of the
reciprocating receiver by the knocking against the screw and in the case of the
rotary receiver by the rotation of the coherer.
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
I claim is:
1. In a receiver for Hertzian transmissions or electro-magnetic waves or the
like the employment of a movable carrier bearing the coherer substantially as
and for the purpose set forth.
2. The reciprocating receiver substantially as and for the purpose set forth.
3. The rotary receiver substantially as and for the purpose set forth.
4. The receiver of the recording type substantially as set forth with reference
to Figure 2.
5. The receiver of the sounder type substantially as set forth with reference
to Figure 1.
0
to Figure 1.
for obtaining de-coherence substantially
Dated this 24th day of November 1899.
For the Applicant,
Q
J. G. LORRAIN, M.I.E.E., &c.,
Norfolk House, Norfolk Street, London, W.C.,
Chartered Patent Agent.