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RADIO BROADCAST ADVERTISER
Linking the Ti^orlJ
with a Lost Continents
Radio now ties together in a close network all the continents on the globe, — except one.
Antarctica, larger than the U. S. A. and .Mexico combined, is still almost totally unknown. Here lies the South Pole on a plateau almost as high as Pike s Peak and ahove which tower still higher mountains and smoking volcanoes. Here is utter silence and frozen desolation. Here drea dful tempests sweep for weeks at a time at 100 miles an liour and more. Commander Richard E. Byrd s Antarctic Expedition, now just embarked, will explore this great continent for the first time.
The Ne w York Times has exclusive rights to the news dis
'Natlonal Screen-Grid St\ort-\i^ave Receiver
patches fromByrd's Expedition. They will he received at the Times office in New York and from there given out to the press of the world.
Of course these messages will he sent and received on short waves. The receiving set used hy the New York Times is the same which heard Nobile's signals in the Arctic. It relies for its operation on National ShortWave equipment.
National Company.
INC. has developed new and better equipment for the simple construction of non-radiating short-wave receiving sets employing the A electrode 222 1 ii be. This equipment is described in our Bulletin No. 131-B. Write us for it to Jay.
NATIONAL
RADIO PRODUCTS
NATIONAL CO., INC. "W". A. READY, PRESIDENT MAIDEN, MASS.
With Naald adapters and connectoralds you can put power tubes in sets — change battery sets to A. C. sets — attach electric pickups to A. C. or D. C. sets — connect radio sets to Victor Electrolas— test A.C. tubes and A. C. sets with D. C. testers — make portable sets more powerful with bigger tubes — make battery sets portable and a host of other things. Or' der from your dealer or write for a complete Naald catalog. Naald has the only complete line of its kind in the world.
ALDEN MANUFACTURING CO.
Dept. RB 3 Brockton, Mass.
CUSTOM SET BUILDERS
Browning-Drake has an interesting and unusual proposition. Take advantage of the fact that more Browning-Drakes are built than any other. Write today.
BROWNING-DRAKE CORP.
Cambridge Massachusetts
Why not subscribe to Radio Broadcast? By the year only $4.00; or two years $6.00, saving $2.40. Send direct to Doubleday, Doran is/ Co., Inc., Garden City, New York.
HOOK-UP BOOK FREE
Improve your reception with
CARBORUNDUM Stabilizing Detector Units, Grid Leaks and Resistors
THE CARBORUNDUM COMPANY Dept. D-2, Niagara falls, n. y.
ELECT RAD
Cle-Ra Tone Radio Sockets
Specially Designed for A. C. Detector Tubes
Spring supported, shock absorbing. The tube-holding element "floats" on perfectly balanced springs. Reduces microphonic disturbances, tends to lengthen life of tube, and lessens the possibility of shortcircuiting closely-spaced tube elements.
Y Type, Green Top, for 5 prong A. C. Tubes: for mounting on top of panel, $ 1 .00 ; for direct attachment to panel, 75c.
Red Top, for Standard UX Type Tubes: for mounting on top of panel, 75c. ; for direct attachment to panel, 50c.
At all Radio and Electrical Dealers and Jobbers
Benjamin Electric Mfg. Co,
120-128 S. Sangamon Street, Chicago
San Francisco 448 Bryant St.
New York
247 W. 17th St.
J