Evening star. [volume] (Washington, D.C.) 1854-1972, 1926-07-11
RADIO GOSSIP AND NEWS

Radio fans and amateurs who at
tend the Sesquicentennial Exposition
in Philadelphia will have an opportu-
nifty to see how Uncle Sam handles
the administration % radio both on
land and sea. A special exhibit has
been installed by the radio section Of
the Department of Commerce, under
the direction of Radio Supervisor r.
7. Cadmus of the third district, which
includes Philadelphia. 1t includes APP
paratus employed in radio transmits
sion and reception, as well as some Of
the more complicated devices used by
Secretary Hoover'S radio police to see
that broadcasters and other transmit
ting stations are operated according
to law.
N Among the more unusual apparatus
used by the Governments radio in
spectors are testing equipment used
to measure field strength of stations,
wave lengths or frequencies and in To-
eating transmitters or other gener-
atorS Of electric waves which cause
interference. Some of these mechan-
isrns are SO delicate that power ennis
sions as low as a fraction of a volt
and currents as small as thou
sandth Of an ampere may be meas
ured accurately.
Two large wall maps indicate the
location of broadcasting and CONNER
cial stations throughout the country,
from which 1t is possible to observe
Just where radio congestion is found.
Other charts indicate how radio trans
mission channels are assigned and
how stations rate as to power used in
transmitting broadcast matter
Part of the exhibit includes a his
toric display OF radio apparatus, in
Guiding some of antique" transmit
tiers and receivers, used but a few
years ago, but now replaced with
modern tube apparatus. A series of
devices illustrate the progress in
both transmission and reception, as
well as methods of measuring wave
lengths and power utilized. Marine
radio power plants and auxiliary
means of transmission for emergency
uses will be demonstrated for fans
not familiar with the transmitting
end of radio.
I 1 Although the activities of the in
spection force are devoted to pure
/ necessary to determine the source of
i radio interference with apparatus de-
signed to show the location of sets
or electric apparatus causing the in
terference in receiving sets. Among
the causes found already are leaking
power lines, poor electric contacts,
sparkling motors of many types and
bad electrical insulation and grounds.
Among the exhibits Is new type
receiving set capable of picking up
/ transmissions in code or phone on
arly wave lengths from a couple Of
meters to around $4,000. A 500 or
{ half-kilowatt transmitter. such as is
used in broadcast work, win be shown,
as well as half -kilowatt Marconi spark
set, radio compass and some anna
tenr equipment.
4 Hill Roxy Returns to Air.
HIS. L. Rothafel, better known to the
1 radio audience as foxy" will return
fo the air Friday night. after an alb
sence of five months, when he leads
the United States Marine Band in a
| concert at the Sylvan Theater. The
entire program will be broadcast by
stations WCAP, WEAF and other
ktations allied with the Broadcasting
Co. of America.
roxy" has not been heard ''on the
air. since last February, when his
gang gave their. final program, until
the Roxy Theater opens, early next
year. It was announced at that time
( 4 lAAdl IAOAy s1OuttQ The NolLt1AtI sOA (plAt-
bining both his radio and motion pic
ture duties TOO strenuous and was
Obliged to devote all his time to his
new film enterprise. the most ambi-
tiOus undertaking of his career.
Roxy" is now IN Quantico. Va, for
q two-week training period with the
Marines, as per orders received from
Col. David D. Porter, commanding Of
ficer Of the Eastern district. at Phila-
delphia. He is a distinguished mem
Der Of the service, having Joined the
Marines to see the world when he
was l6. He served Sas corporal with
the famous United States Marine
Corps. went through the Boxer Rebel.
lion in China, and. after the adven-
turous period OF seven years, was dis
charged from the service, carrying
with him a medal as a decoration for
his distinguished work, The title of
major. u. s. M. G., was personally
conferred upon him by Maj. Gen.
John A. Leieune.
Roxy Jolned the Quantico camp
July 2. and Wl come to Washinston