Los Angeles herald., 1909-04-06
SHOWS USES OF
WIRELESS PHONE
DEMONSTRATION GIVEN BY Ex-
PERT ELECTRICIAN
MESSAGES TAKEN IN ANY PART
OF THE BUILDING
Absence of Noise in Receiver and ABB
solute Secrecy Leading Features
That Promise to Be of
Great Value

A wireless telephone for office, store
and factory use is the latest thlng III
wireless telephony that William Du-
bilier, chief electrician of the Colllns
Wireless company, is demonstrating IN
Los Angeles.
onstration of the new apparatus in MS
quarters in the Citizens National bank
building.
In the factory set, as it is called, in
dnction is used, there being no neces-
sity for aerials. The transmitter ana
receptor are not grounded, as is the
case in long distance wireless teie-
phony, where oscillation arcs provide
the means of transmitting electric
waves, or wave sounds.
The apparatus, as shown yesterday,
consists of an ordinary telephone
transmitter, set upon tripod, ana
connected with a battery and con-
denser.
An ordinary receiver is attached to a
coil of wire, which is insulated and is
of such size that it can be carried In
the hand, although the ordinary man
ner of carrying it is about the body.
1t can be reduced, however, to such
size as to be conveniently carried in
an ordinary pocket.
Walls No Obstacles
With the receiver held to the ear or
fastened about the head with an alum
mum band a person can walk ABOUT
any building, be separated by seVeral
partitions or walls from the transmit
ter and yet receive messages from the
person talking into the receiver with
out any wire connection. This feat
was shown concluAvely yesterday, and
incredulous as it may seem, person
can be fully convinced of it by visiting
Mr.. Dubilier's Office.
One great advantage is the entire
absence of the buzz and whirr often
SO noticeable in the wire telephone.
The superintendent of a factory can
be seated in his office and issue orders
to the foreman or anyone supplied with
the aluminium head receiver in any
part of the building. Furthermore, no
person but the one for whom the mes
sage is intended will receive it, which Is
the point OF advantage that the wire
less telephone has over the wireless
telegraph
This instrument is made purposely
for hotels department stores and fac
tories. If several foremen in large
factory are equipped with the head re-
ceivers, by simply using a switch only
the party desired and no other person
similarly equipped with the headgear
can receive the message. Thus it is
possible for a foreman on, say, the
fifth floor to receive orders from the
Superintendent seated in his office
without any other employe being aware
of it.
Absolute Secrecy insured
The strong feature of this latest de-
yelopment is it's quickness and secrecy,
and no longer need employers be both
cred with busy lines or fear that some
important business transaction may be
communicated to anyone who should
not hear about 1t.
The mechanism can be perfected to
such an extent, and was in the instru-
ments used yesterday that the breath
ing of a person into the transmitter is
audible, and the ticking of a watch
can be heard as distinctly as if held to
the ear. The person receiving the
wireless message does not have to re-
main at any certain point, but may
be walking about when the. wave
sounds reach him and transmit the
intended message.
Already the wireless company has
contracted to establish such a system
in the Ship hotel at Venice, and in the
large department stores of Los An
geles.
The aerials on the top of the Ham
burger and the National Bank build
ings are completed, and wireless mes
sages between the two points can be
sent in few days, as soon as minor
details are completed and the neces-
sary apparatus has arrived
The United States war department is
taking an active interest in wireless
telephony, and it has been shown that
in time of war, or during maneuvers,
officers on board the men-of-War may
telephone their orders and obtain an
instantaneous confirmation of the
same.
That this system will be economical
can be seen from the fact that the
~
warships now used for wireless teleg-
raphy can be utilized in transmitting
and receiving long distance wireless
telephone messages