Evening star., 1924-06-16
White HOUSE RADIO
SET EARNS PRAISE
Cooidges' New Receiving Equip
ment Called Best in World
by Experts.
BUILT IN NOVEL RADIO.CART
Same Type May Be Installed on
First-Class Battleships.
BY CARL III. BUTMAN.

The President and Mrs. Coolidge
have a new and unique radio receiv-
ing set, which some government experts
insist Is the best broadcast receiver
in the country. II not in the world.
1t surpasses in beauty. IL not in eft1-
cheney, even the set of King George,
recently installed in Buckingham
Palace.
On the new set the Chief Executive
and his family listened in on ses-
sions of the Republican convention,
although the White House also had
direct telephone line from the
American Telephone and Telegraph
circuit connected with an ampliter.
Technically, the Executive Man
sion set, which is of special con-
struction and mounting, is built on
the super -heterodyne principle, with
IA total of nine miniature tubes. Ihe
main receiver. which has six tubes,
was manufactured for the Navy. This
is supplemented by a push-pull am
plifier of three tubes. No ground Is
used, and the antenna is folding
affair, which also disappears in back
of a portable mahogny table cabinet.
The loud speaking horn. concealed
by an attractive circular basket
woven screen, sits on the top OF the
table. The whole set, with the pat
teries. is completely hidden within
the table cabinet. resembling good
sized tea cart. The panels with the
dials and controls are behind doors,
and the batteries are stored on an
invisible shelf.
Installed by Naval Expert
Skilled artificers of the Washing
ton navy yard rebuilt serving table
into a radio cabinet, mounted IL on
wheels, and installed the apparatus,
E-tI I,.fI htyI AAYf
Commander L. ID. Langworthy OF the
radio section. naval bureau of engi-
neering. This expert also supervised
the work and demonstrated the opera
tion of the set for the Coolidge family
at the White House just before the
Cleveland convention started.
without revealing the name OF the
manufacturers of the set proper,
naval experts say that receiving sets
OF similar type will be installed on
all new first-line naval craft, as soon
as they are put on the market. Ihis
particular type was selected as the
best broadcast receiving set available,
after a study and test OF practically
all sets now on the market or ready
for experimental tests. In winter
time, the White House apparatus
should bring in any broadcaster in the
country. and after special induc-
tiVely-tuned outside aerial is hooked
up for use in the mansion, probably
many foreign stations can be picked
up just as easily as local ones.
The radio cart is kept in the SEQ
ond floor sitting room OF the White
House, but as it is mounted on wheels
it may be trundled into any room or
taken down stairs on the elevator If
the family 80 desires. In recent ex-
perimental tests Commander Lang
worthy says this set reproduced per-
fectly all voice freQuencieS from 16
to 10000 and all musical notes from
| the low. deep tone of a kettle drum
to the high-pitched notes of piccalo.
Mayfower Has New Set.
Although the original White House
set installed in the study for Presi-
dent Harding by naval experts re-
mains in place, it is believed that
| the new set will be more popular and
| far more efficient 1t is especially
designed for the lower wave lengths
whereas the old naval set was built
to be tuned to practically all wave
| lengths and was far more difficult to
operate. The new set is also the
property of the Navy, it being
signed to the White House for the
| use of the Chief Executive and his
| family.
A new neutrodyne set has also been
completed by the Navy and is now
| installed aboard the Presidents
| yacht, Mayfiower. so that when on
cruises on the Potomac or Chesapeake
Bay the President and his guests
may keep in touch with the popular
broadcasters if they desire.
Copyright, 1924