Evening star. [volume] (Washington, D.C.) 1854-1972, 1919-01-12

called to make tests. Tney nrSt re.
ported favorably upon it's use under
ground. but doubted its efficacy under
water. Experiments at Piney Point
demonstrated that the underwater use
also was feasible.
Signals From France Received.
Lieut.. Taylor of the Great Lakes
station put the system in practical
operation there and DR.. Austin of the
United States bureau Of standards has
made a study of It to explain how the
waves are transmitted through the
Hssrth: slEnaa. fron Parts and !,ypn.
Hooper and at the Great Lakes.
By way OF demonstrating the uses
OF the device In the trenches Mr.. ROg-
ers showed to group of sdfstin-
guished visitors an underground sta
ton he constructed in q sort Of cave
he sent messages.
For two years Mr.. Rogers worked
to improve his invention. For example
he succeeded In increasing the audi
bilfty of messages from Germany a
hundred fold. Stations heard were
Lyon. France; Rome. Italy; Nauen,
Germany; Wales. Great Britain, and
Pearl Harbor, Honolulu.
Capt. aoopers Letter.
I Capt Hooper. in letter to Mr..
Rogers, written November. 1917,
wrote:
Permit me to acknowledge your
kind and thoughtful letter of Novem-
Der 90. am sorry to leave my many
friends in Washington and to give up
with radio. I will always value this
duty here as the most interesting
have been associated with. In this
connection I take occasion to state
that your invention is one above all
which has been of greatest interest to
me, and the one which consider Of
greatest value, especially during the
present crisis, and for this accept my
sincere thanks, and heartiest con-
gratulations. May you soon have a
return of good health and many years
Of happiness"
Admiral strother Smith. then Capt.
Smith. wrote Mr.. Rogers on December
z, 1917:
''It is great pleasure to me to feel
that I have been instrumental in
bringing the result of your work be-
fore the Navy Department and assist
ing somewhat in putting 1t into ac-
tual practice. Out of the many thou
that a very, very small percentage
are valuable and it is worth at least
a years work to get one that feel
will give Tasting benef1t to the serv-
ice that ] take pleasure in serving.
Hoping you will soon be restored to
perfect health. believe me, etc.
Admiral Grifn's Praise.
In response to an inquiry from Clar-
ence J. Owens. director general Of the
Southern Commercial Congress. Ad-
miral Griffin. U. s. N. chief Of the bu-
reau Of steam engineering. wrote un-
der date of December 81. 1918. as fol-
lows:
"In reply to your question regard
ing the originator of the underground
radio system. you are advised that
Mr.. J. H. Rogers of Hyattsville. Md.
was the originator Of this system.
There have been other claimants to
methods of underground radio sig
mailing, but none was useful. within
the Navy Departments knowledge to
the extent of being a valuable asset
to the general scheme of radio COM
munications. The Introduction of Mr..
Rogers receiving system marked tho
beginning Of the use Of underground
aerials for receiving. to great ad-
vantage over raised aerials. and has
been valuable to the Navy during the
war. At your request the bureau Is
preparing extracts from the reports
Of the various stations where ex-
periments with this system were per-
formed"