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Radio Broadcast
intelligible. By increasing all of the sound from the speaker the difference between the direct and reflected sound may be made intelligible, but the total loudness may be painful and the radio receiving equipment may be strained.
Glass in windows reflects or transmits nearly all of the sound that strikes the glass. The glass windows let in noise interference from the outside and produce reflection interference inside. Open windows produce no reflection, but let noises come in. Double glass with a dead air space between will cut out much of the interference from the outside, but the inside glass will reflect. Soft, thick, closely knit curtains will reduce the noises from the outside and reduce the reflection inside. Noises may be prevented from entering through a ventilation opening by hanging a heavy curtain, that is broader than the opening, in front of the opening and a few inches from it.
Hard, smooth plaster walls and ceilings usu
ally produce the most reflection and interference because of their size. Soft paper or cloth having a deep soft surface like blotting paper or felt will reflect very little sound.
Any hard, smooth surface is a sound reflector which usually produces interference, while soft material like upholstery, felt, or shoddy absorbs sound and prevents interference. Any hard and rough surface reflects but it reflects from many adjacent angular surfaces and does not produce much interference, because the reflected sound waves are thrown into each other contrariwise and neutralize themselves to a considerable extent before they reach the ear.
Painful loudness can usually be avoided by choosing the room with the softest lining for your loud speaker, by cutting out and shutting out local noises, by selecting for reception a broadcasting station that is near enough to give too much volume, and then by cutting down the volume here and there until the announcer talks like a gentleman.
SEEK RELIEF FROM CODE INTERFERENCE
Representatives of the Boston American, the National Association of Broadcasters, and the Radio Club of America called on'the President suggesting that commercial traffic be abolished on 450 meters-that more funds a"dt;nh7^4ioPners°^ be granted the Department of Commerce for radio-that the radio laws of .9.2 be brought up to date by rev, MI. Left to right, Walter Howey, Managing Editor, Boston American; George Burghard, President, Radio Club of Ame , | . V L. Hogan, Radio Club of America; J. Shephard, Vice-President, National Association of Broadcasters; and Paul Godley,
Radio Club of America