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The March of Radio
181
uously, sending out sufficient power to transmit perfectly as far as Germany. Instead of the 2OQ-KW alternator ordinarily used, six pliotrons, rated at 20 KW each, were used to generate the high-frequency power required to excite the antenna. A i5,ooo-volt supply of continuous current power is required for the plate circuits of these tubes and here also the electron evaporation idea of Richardson is utilized. Two-electrode tubes, plate and filament
or even i,ooo-KW whenever the demand for them will justify the expense involved.
Neckties, Soap, and Radio Sets for Sale
WITH the tremendous popular interest in radio, and possible profits in catering to the demands for apparatus, manufacturers and jobbers have placed radio apparatus in practically every place where
THE LARGEST VACUUM TUBE IN THE WORLD
This i ,000,000watt tube, developed in the research laboratory of the General Electric Company by Mr. J. H. Payne, Jr., is designed for power purposes rather than for radio use. Its electrical output, expressed in terms of the incandescent lamp requirement, give some idea of its power. It will supply energy equivalent to that required to light 40,000 25-watt lamps, or the electrical energy required by 1,500 average homes. The tungsten filament in this tube is so large that if drawn into filament of the size used in the household incandescent lamp it would supply filaments for 175,000 such lamps
only, are used as rectifiers, to change the high voltage alternating-current supply available at the station into suitable continuous-current power.
The installation of these tube transmitters is so simple and the operation so reliable that it seems safe to predict that the life of all other high-frequency generators is already measured. The tubes used in this first large installation have about five thousand times the power of the small transmitter tubes used by amateur broadcasters, but the research men who are responsible for the development of these 20KW tubes are ready to build tubes of lOO-KW
people congregate. Drug stores, music stores, cigar stores, even men's furnishing stores have radio sets for sale. Can any good come from this method of merchandizing radio sets?
It seems to us that the practice will \\X\doubtedly result in many disappointments for the purchasers, and consequent disgust with radio. If a store has apparatus fc>/sale, the clerical force -will naturally do itsjbest to sell it, and if the customer seems doubtful about buying, unreasonable and fooly^fi claims will be made regarding the reception to be expected from the sets. And Because of ignorance of radio, both of purchaser and salesman, mis