The sun. [volume] (New York [N.Y.]) 1833-1916, 1915-10-03

would lack that measure Of privacy
now obtaina BILE over a wire sent sys-
tenn. This secrecy Is really a fiction
as matters are to-day. The operators
of every connecting switchboard can
listen at will. But wireless telephony
can he made reasonably confidential
by a system OF tuning, and for this the
mercury vapor arc apparatus in its
various forms is peculiarly suitable.
1t Is possible to change the funda.
mental a length instantly over n
given line, and nsighharlug lines would
be ~insensitlve or deaf II not so at
tuned.
The fact is this desideratum Of Sc
Crecy is helped in direct proportion as
We get away from a single wave
length system and resort to different
wave lengths or apparatus using "
wave lengths simultaneously. This
sounds puzzling. no doubt. but 1t can
be expressed in a popular fashion, As
! conceive ii II may be possible to use
two wave lengths that will produce n
third. or beat and the receiving APP
paratus, Ike the sending one. can he
made responsive 80 this resultant beat.
I'm short, the message is transmitted
in a wireless envelope of two fianking
and dissimilar waves, and il would
take a good deal Of puzzling on the
part OF the inQuisitive to identify these
separate protective oscillations. 4
wide variety Of these ~eXpedlents II
possible. and to just that extent the
fear of Interference is reduced and
the number of services working in a
given zone multiplied.
Up to the present the wireless .ele-
phone has been installed only on a
few trains. and these of the so-called
limited sort. But there is nothing to
prevent the equipping of all trains.
both freight and passenger, with
wireless telephones capable both of
receiving and transmitting messages
for spans Of quite ten miles.
Generators operated by tho axles
would easily furnish the nepdful cleo
trical energy. and trains approaching
biockhOuses could maintain vocal COM
n:Inication with the man in the tower
even before the latter came In sight,
I-stead OF hating for orders the en-
g,ne driver or conductor would get his
instructions while going full speed, and
n great deal of time could thus he
saved.
Further, the movement OF trains
in bad weather, the sort that usually
puts out of working existing overhead
telegraph lines. would have no terrors
for the railrCrad His compact
and fairly sheltered installation would
&c on working despite the storm and
messages could be exchanged between
train and train.
1.-THE possibilities OF wireless te-
lephony are manifold. Ships now
equipped with radio apparatus could
telephone, and the radius of commu-
nication would depend entirely upon
the strength of the generative plant.
For river craft inexpensive apparatus
would be Of the utmost service, es-
pecially where the volume OF traffic
is large and fog increases the danger
OF navigation. The same applies to
busy harbors like u own.
1.-THE mind instinctively suggests
many other applications. The point
has been to produce commercially
practicable apparatus. have found
this possible, both for sending and re-
ceiving. in adaptations of the mercury
vapOr arc, and S long AS the energy
input suffices it Is possible to span
any distance by wireless telephony.
My mercury vapor arc receiver works
with equal facility when dealing with
wireless telegraph impulses or tele-
phonic speech, while my oscillator in
it's present form gives me a compact,
an economical and n very efficient
means for transmission.
1.-The impossible of yesterday is a
reasonable promise to-day. and
probable accomplishment tomorrow.
Success ultimately commonly rests on
the simplest of principles, hut physi-
cal obstacles obstruct and battle until
patience, inventive cunning and the
, march of associate arts make victory
possible"