New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1919-02-16

cluded several large tuning inductances.
variable condensera, a one-stcp audion amp
LITER (single audiotron bulb only.) and two
pairs of Baldwin phones telephone re-
ceivers). This apparatus was connected
up to one OF Mr.. Rogers's latest buried
antenna-a single rubber covered, stranded
copper cable, about the size of a small igni-
ton cable, extending westward for dis
tancc of 4 900 feet, so as to be in a place
with the high power European radio sta
tons This cable is incased in iron pipe
(gas pipe), each 2O-foot section Of which is
insulated from the abutting sections by
means of a rubber hose garden hose)
slipped over the pipe ends for few inches.
This is buried in a dirt trench about three
feet deep filled in with soil. The cable is IN
sulated at the free end and is connected
up, as in Fig. 2. The rubber covered wire
alone has been used in all subaQucous tests,
and gives fine results when simply buried in
the ground, the decay not being so rapid as
probably would be imagined. This latest
aerial in the iron pipe is a new develop
ment and experiments are still going on
with it. 1t works wonderfully we'll. The
1000 foot aerial here described is best
suited to receiving wave lengths Of 5000 to
$4,000 metres. For shorter wave lengths
aerials Of smaller dimensions are employed
Lyons!
"'Horc's the Lyons station in France
said Mr.. Rogers. A turn of the knob on
the specially elaborated condenser, and there
was Lyons (France) sure enough Static
and interference were unheard. Next the
great stations across the broad Atlantic,
at Nauen, Germany; Carnarvon, Wales, and
Rome, Italy, were heard with equal loud
ness and clarity. This laboratory station,
which has been used by the Navy Depart
mont during the war, has picked up practi-
cally all the high power stations on the
globe. American stations were then picked
up by changing the wave lengths, and
finally test was made short (250 feet
in length) buried ground antenna adapted
to receiving wave lengths of 200 to 800
metres. Wireless telephone messages were
picked up from Washington, q distance of
about seven miles. 1t is most interesting to
note at this juncture. as the naval tests
at Norfolk, Va, on similar aerial have
shown, that a radio message from an air
plane cannot be picked up on the under
ground aerial until the plane is directly
over the station. This would seem to prove
two thingsfrst, that the short waves sent
out by the airplane radio set do not pene-
tratc into the ground very far, if at all;
and, second, that airplane radio transmits
sion and reception are effected solely by
ctheric waves.
"Referring to Figures and we find
several interesting points. Fig. ga shows
how a double ground aerial is sometimes
connected Also, in the case Of Mr..
Rogcrss test station, several sets Of these
buried antenne are best employed distrib-
uted about the station shown in Fig. B.
"The Rogers underground antenn@ system
has been used at the Belmar, NJ j., station
during the war with most gratifying
suits, az reported by the Navy department,
and it's successful and unfaling operation
during tho twcnty-four hours Of the day
resulted in TROLLING and duadrupling the
pacity Of this great transatlantic highway
Of intelligence communication The official
reports in connection with the work ac
complishcd with tho underground Rogers