Radio broadcast .. (1922-30)

Record Details:

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New Equipment THE ANDREWS PADDLEWHEEL COIL A well made inductance designed to give a higher ratio of inductance to resistance. The several groups of spiral windings are space insulated from each other without the use of any adhesives or dope. Tuned with a .00025 mfd. condenser, this R. F. transformer inductance has a range from 200 to 600 meters. Made by Radio Units Inc., Maywood, Illinois. Price $3.00 TOGGLE BATTERY SWITCH A new battery switch designed for use in the radio receiver. It is neat in appearance with a polished nickel finish and has large make-and-break contact surfaces. The wide spacing of the terminals permits ease in making connections. It is easily mounted on the panel with only one hole required. Made by The Cutler-Hammer Mfg. Co., Milwaukee, Wisconsin KELLOGG CONDENSER A low loss variable condenser with a heavy brass frame containing a minimum amount of metal. Direct three-point contact with the rotor assures positive connection. A special Kellogg dial in conjunction with the vernier attachment makes for very fine tuning adjustment. Made by the Kellogg Switchboard and Supply Co., Adams and Aberdeen Sts., Chicago, Illinois BALLGRIP SOCKET A molded bakelite socket of unusual design. Contact with the tube prongs is obtained through a ball socket arrangement molded into the base of the unit. The construction is such as to eliminate the possibility of internal short circuiting. Made by Quality Molded Products, Inc., 1 Exchange Place, Jersey City, New Jersey. Price $1.25 AMPLION LOUD SPEAKER This speaker is designed to give great sensitivity and naturalness of tone. The Amplion "Floating Diaphragm," kept from contact with metal by rubber gaskets, rests on a narrow ledge in the case, lightly held there by a spring ring with enough pressure to prevent "chatter" when extreme volume is desired. Another feature of the Amplion is the use of rubber insulation between the several sections of the horn to eliminate any ring or resonance. Made by The Amplion Corporation of America, 280 Madison Ave., New York City