SOUNDS TOO HIGH TO HEAR
SOUND-WAVES of too high a pitch to affect the ear have been produced and are likely to prove useful, we are told by an editorial writer in The Electrical World. Such waves, of course, are not sound in the strictest sense, for sound-waves are due to vibrations within the audibility range [...]

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RADIO ADVANCES 1929
by JOHN V. L. HOGAN
Radio Engineer and Inventor
THE growth of radio during 1929 has been not only in the improvement of technical processes and apparatus, but also in the organization and extension of its services and in the adaptation of radio principles to work in various other fields.
Public contact with radio is mainly [...]

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Atwater-Kent Radios
MODEL 3S, 6-tube ONE Dial Receiver, less tubes and batteries. $70. Speaker, Model H, $21. Other ONE Dial Models, $85 to $140. Radio Speakers, $16 to $23.
ANY ONE who can make and sell a million of anything in four years must be making a product which satisfies those who use it.
Atwater Kent Radio does [...]

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