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RADIO BROADCAST ADVERTISER
all-american
90
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Won
THE RECEPTION on board the Berengaria, night after night, of the signals from the Drake Hotel, Chicago, during the entire voyage, from New York to Cherbourg, France, a distance of 4000 miles, was a world record achievement for consistent reception. The set used employed "ALL-AMERICAN" Amplifying Transformers.
Today another record is being made. Slowly winding its way up into the frozen North is the Bowdoin, on board of which is Captain Donald B. McMillan, on a scientific expedition to the North Pole.
Night after night, up in the Artie Ocean, he is listening to the world thousands of miles south of him. Again 'ALL-AMERICAN" Amplifying Transformers are being used, and again new world records are being achieved.
You, too, can set new records with your own set by the use of "ALL AMERICAN " Amplifying Transformers.
Ask your dealer to show you these world record-breaking instruments. They are as attractive as they are efficient.
Book of Successful Hookups sent free on receipt of 2c for postage.
200 No. Jeiterson 3t,lhkago, 111 AU^c«ic4fr
Audio Frequency Transformer
CHICA
Warren Radio Loop, cut away to show construction
F?A D I Q
FreeYour Set From VVSTSTCf INTERFERENCE ^SiSr
The U. S. Army Signal Corps use loops to obtain absolutely unlimited, uninterrupted radio communication. To really enjoy your super-sensitive set, banish interference from static, stray atmospherics by using a loop aerial the best you can buy — a Warren Radio Loop. More "persistent" than the dangerous, cumbersome old-fashioned outside aerial. Easier to tune. Built on stronger frame and protected from dust, dampness and meddling by tight cover. Types for all wave meter lengths from 175 to 18,000. Most compact, efficient loop perfected. Buy a IV arren Radio Loop Noiv!
Type-A-737 (300-700 meters) 6 inches square — nondirectional $10.
TypeA-7 236 (175-1000 meters) 6 inches square — nondirectional $12.
Type-B-2537 (300-700 meters) 18 inches square — directional $20.
Type-UL-2520 (200-18,000 meters) with honeycomb coil
mounting. 18 inches square — directional....$25.
SEND FOR BULLETIN X-102
V-DE-CO RADIO MFG. CO., Dept. B, ASBURY PARK, N. J.
RADIO PANELS
Cut exactly to size and a guaranteed 12 hour shipment. thick .oij^c per square inch, 3/16" thick .oij^c Made of the highest grade black fibre. This material possesses electrical strength of 200 volts per mil, is inexpensive, unbreakable, easy to work and takes a fine finish. We pay postage.
RADIO INSTRUMENT & PANELCO.,564 W.MonroeSt.,Chicago,Ill.
W.T.50I
For tube sets, use our Special Adaptor, 75c extra. To convert crystal sets into tube sets, use Special Socket, 40c extra.
Radio Research Guild 40 Clinton St. Newark, N. J.
THE WONDER-WORKER, THE RADIO SENSATION Surface perfectly smooth and supersensitive everywhere
CENTURY MAXITONE DETECTOR, Price $1
Order from your dealer or direct from us Century Products Co., 110 So. 13th St., Allentown, Pa.
^ Tested and approved
by Radio Broadcast ^