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Show RADIO PRIMER ) ! ' 4 RADIO I'lUMKK. QUENCHED GAP A spark sap between be-tween electrodes which arc kept cool and are placed cjose together. This pruduces a pure wave, one that is, j sharply tuned and has the advantage I of i.eing nolselcs In operation, because 1 of the short gaps The action is lm-' lm-' proved f the spark gap is enclosed In an air-tight chamber. SPARK TRANSMISSION A nioth-od nioth-od of damped wave radio telegraphy In which the radio waves are forme. 1 by the spark action between two electrodes. This form of radio trans mission Is fast being supplanted hy continuous (O W). or undamped wave transmission by vhich radio telephony tel-ephony Is rhadjB iusilhle. |