Highland recorder. (Monterey, Highland County, Va.) 1877-1972, 1916-03-17
FIGHT ON SUBMARINES
pETEcToR SYSTEMS coNSiD-
: Erred BY THE SCIENTISTS.
Thought to BE Most Effective Method
OF Combating This Most Deadly OF
All Modern Naval Weapons
of Warfare.


| The prime advantage Of the subma-
rine~-its ability to escape detection
through sight-has been overcome by
the invention for use by the entente
allies of a means of detecting its pres
ence through hearing. The exact ma
ture of some of the most essential fea-
lures of this invention has, of course,
been kept secret, but general de-
/ scription of it's manner Of working is
given in the Scientific American. One
of those who contributed to the de-
velopment of this detector system is
| William Dubilier, an American cleo
! trical engineer with numerous wire
! less telephone and wireless telegraph
/ inventions to his credit. He had gone
/ to France on the mission OF installing
wireless telegraph apparatus on air
craft, when he was called upon to aid
! in solving the submarine detector
problem. Dubilier went to Cherbourg,
an important French port on the Eng
lish channel, where he found PROBES
sor Tissot OF the French Academy OF
7 Science. hard at work on the detector
system.
For some time before this, devices
had been contrived by which it was
possible to detect the sound waves
made by submarines, but these de-
vices also conveyed the noises made
by the propellers OF all kinds OF craft
and they were of little value, because
It was practically impossible to dis
tinguish the sounds made by sub
marine from those coming from other
vessc.s. Fortunately for the invea-
tors. however, it was discovered, IN
the course OF the tests, that the TN
lerwater craft were the sources or
sound waves Of exceedingly high fire.
quency, quite distinct from any other
subaqueous sounds. While the cause
of the high-pitched sound is known to
the inventors, it cannot be divulged
since it would. then, be possible for
submarine constructors to eliminate
the source Of the telltale sound waves.
1t still remained to the inventors TO
eliminate all other sound waves from
affecting the detector and also to de-
wise means by which the distance OF
the submarine and the direction OF its
ravel could be determined. 1t re.
quired several months of careful eX-
perimenting to develop suitable res
onance tubes for filtering out unde-
sirable sounds. At first the device
finally developed, worked at distance
of a few miles and then its range was
Increased to SIS miles, by use OF the
Audion amplifier, an American lnVen-
lion. This system is used all along
The coasts of the British isles and
France. It is not available for use on
vessels because of it's extreme sens1-
tivity. An illustration shows the form
If the device as it lies in the water
q cable reaching out from shore and
ending in the sea in eight branches,
each with rounded object at the end,
somewhat resembling a telephone re-
ceiyer-a microphone. Each micro
phone is placed in such manner as
to receive sound waves best in one
direction. Accordingly, by listening
to the sounds received by the different
microphones, and slowly moving
switch over the several contacts, the
operator can determine in what dlrec-
ton the submarine is moving. How
The distance of the submarine is &C.
tected is kept more strictly secret
Means of communication are main
tanned between these detectors on
shore and numerous vessels which are
sent out to attack the submarines.
Since the appearance of the Scien-
:ifc American article, the New YORK
Times relates that Dr. Lee de Forest
Of New York, inventor of the Audlcl
amplifer, has received hurry-up Call
from the British government and has
sailed for London. The use OF MS
amplifier in the submarine detection
device attracted the attention of the
British to him, and his services are
desired for contrivance of system by
which the approach of Zeppelins can
be detected at great distance. The
Times says that the form of Audlon
used by the British in detecting SUBJ
marines is not so highly developed as
the most recent of the De Forest in
yentions. Doctor de Forest proposes
to work out a system similar to that
used for detecting submarines by
which not only their sounds will be re-
corded, but their distance and the di-
rection in which they are travelling
will be known.