Evening star. [volume] (Washington, D.C.) 1854-1972, 1902-09-24

Its members are: Rear Admiral R. B. Brad
ford chief of the bureau Of equipment,
chairman; Commander Conway H. Arnold,
Commander George l.. Dyer, Commander
Charles j. Badger Lieutenant A M.
Beecher and Lieutenant j. M. Hudgins.
The last named Is In charge of the Wash
ington station. The experiments conducted
here, however, have been actively super
vsed and aided by Lieutenant Commander
w. S. Hogg, who Is now stationed in the
Washington navy yard in charge of all the
equipment work of that establishment and
who has perfected a microphone which en-
ables the operator to receive as at tele-
phone the messages sent to the receiving
station. Lieutenant Commander Hogg and
Lieutenant Hudgins have the assistance
here In Washington of Otto Scheiler, a
civil engineer. Mr. Scheller represents in
supplied the ''SlabyArco' instruments used
for these experiments, and 1t is he who Is
named in the dispatch quoted.
If the further experiments between these
two American stations develop continued
and satisfactory results it is very probable
an extensive equipment will be provided by
the Navy Department for use by armies in
the field and between navy yards of con-
venient location. For this purpose a special
field service has been designed, of which
The Star today prints photograph The
system has reached such a stage that
binary electric lighting wires, high Chin
neys, telegraph poles or any other suitable
structures can be used in lieu of special
mast, and the field of operation Is there
fore widened within the reach of practical
use by armies in the field
The System Explained.
The theory of this system was explained
by one of the Washington operators this
morning about as follows:
1T has been stated that if the electrical
waves strike vertical and earthed re-
ceiving wire the wire will be set into a
state of electric oscillation, the amplitude
of which VIII follow a Sine law between the
endS OF the Wire or mast, the earth point
constituting the modal point of the wave
of electric tension and the other extremity
the loop. The vertical wire has in virtue
of its own self-induction and capacity with
respect to the earth definite wave form.
If now an impulse wave is received by
1t al different frequency, for example a
lower one, an inductance is inserted close
over the earthed point by the correct pro-
portioning of which the specific wave form
of the receiver can be made similar to that
of the transmitter; that is. the receiving
wire can be tuned or syntonized with regard
to the tranSmitter.
Each individual receiving apparatus Is
provided according to the distance to be
signaled with a wave indicator consisting
of a sensitive vacuum 'coherer' so that it's
constituencies may be regulated
The coherer' Is a detector of electric
waves. In order to bring to it the largest
possible alternating tension second tuned
system is set into oscillation through the
receiving wire, and in this a wave Indicator
is situated, with one pole exposed to an
alternating potential of great amplitude
while the tension Of the other pole is kept
constant by connection with a capacity
or earth, so that between the two poles the
maximum possible difference of potential
exists.
What Transmitter Renders Possible.
This tranSmitter renders possible In
consequence of its small dampIng effect,
an exceedingly sharp tuning at the receiv-
err Moreover, the earthed antennae carries
only exceeding small and scarcely observa-
BILE tensions. It's electrical efficiency is
very favorable.
THE advantages claimed for such a de-
vice, which might be called a system of re-
Spouse between instruments, are said to be
Indicated:
by the long distances through which sig
nails can be transmitted having regard to
the shortness Of the transmitting and re-
ceiving antennae and the small consump-
ton of energy.
by the complete exclusion of electro
static atmospheric disturbances at the re-
ception of signals.
BY the possibility of using an antennae
for the transmitter and receiver, lightning
conductors. Iron chimnsys. poles or masts
or other earthed vertical conductors al
ready existing
by the entire absence O: danger from
the transmitter wire.
by the possibility, due to the use of an
the received signals and of receiving with
out interference messages from several
transmitting stations at one and the same
time"