Radio today (Sept 1935-Dec 1936)

NEW THINGS (Continued from page 51). WIND BATTERY CHARGER * Generator driven by wind power. Employs 5%-foot propeller to utilize low winds. Charge 6-volt storage batteries. Also has capacity to light several rooms. Mounts atop any high building. Rugged and efficient construction claimed. Zephyr Power Co., Dodge and 11th, Omaha, Neb. — Radio Today SECTIONAL CABINETS * Sectional wooden cabinets suitable for storing small parts. Available with 2y2 in. or 55^ in. high drawers — two rows of former interchangeable with latter through use of removable cross partition. Sections 23j^ in. wide x 15 in. deep x 27 in. high. Two, four, or six drawers to a shelf. Exterior of white oak in medium finish. Model 1740— price $27.10. J. D. "Warren Mfg. Co., Montpelier. Ohio. — Radio Today LOW OHM CARBON RESISTORS * Carbon resistors as low as 0.04 qhms — power ratings from % to 10 watts — type LV. Withstand humidity conditions much more severe than specified by R.M.A. Conform to same standards of life, voltage, load, and overload characteristics set by regular Ohiohm resistors. Ohio Carbon Co., Lakewood, Ohio — Radio Today STORAGE CABINETS * Handy storage cabinets for parts — 9^4x21/ix4;/ inches. Can be stacked to fit any available space. Obtained free with purchase of condenser kits. Tobe Deutschmann Corp., Canton, Mass. — Radio Today VELOCITY MICROPHONE * Midget high-impedance velocity microphone. Hangs from shoulders — always correct distance from mouth. Output constant within 1 db. with speaker's head in any direction. Excellent for lecturers and dinner speakers. Size of match box — weighs eight ounces. High-level and high-impedance eliminates need of separate pre-amplifier — works directly into grid of amplifier tube. Amperite Corp., 561 Broadway, New York City. — Radio Today CRYSTAL MICROPHONE + Diaphragm-type crystal microphone, designed for communica tions service in airways, police, and amateur radiophone systems. Linearly increasing response of 20 db. from 60 to 2,000 cycles and flat from 2,000 to 4,000 followed by gradual cut-off. Rising characteristic said to attenuate low frequencies, preventing overload — effective side-band power doubled. Model 70S— Shure Brothers Co., 215 W. Huron St., Chicago, 111.— Radio Today HIGH OHMAGE RESISTORS * Three-watt carbonized resistors — 100 ohms to 100 megohms. Low temperatu r e coefficient of -0.0003/°C. Absolutely noiseless in operation— non-hydroscopic coating of lacquer for moisture-proofing. Resistance permanent with age — independent of voltage. Suitable for use in photocell circuits and high-quality amplifiers. Precision units available for use as meter mirltipliers. Three-watt 40 megohms — list price $.90. Morrill and Morrill, 30 Church St., New York City — Radio Today SOCKET FOR ACORN TUBES * Special extruded isolantite socket for ultra-high-frequency acorn-type tubes, 954 and 955. Only \'/% inch in diameter. Has alignment plug to insure proper insertion of tube. Tops and sides glazed for high surface resistivity. Terminals recessed on one side, permitting flat mounting to metal shield, thereby reducing interstage coupling. Hammarlund Mfg. Co., 424 W. 33rd St., New York City— Radio Today ALL-WAVE ANTENNA KIT ■*• Antenna kit comprising doublet aerial with twisted-pair leadin, antenna coupler, and receiver coupler. All connections factory-wired and soldered — ready for installation with necessary insulators. Said to be highly efficient on broadcast waves and on short-wave broadcast bands — background noise reduced to absolute minimum. List price $6.75. Technical Appliance Corp., Long Island City, N. Y — Radio Today NOISE SUPPRESSORS * Complete line of noise eliminators for use with receiver or appliances. Extremely compact. Easily installed — between outlet and line plug with grounded lead. Model RN especially effective at frequencies from 150 to 20,000 kilocycles— sectional band-suppression construction — capacity of 3 amperes. Other models of both capacitive and capacitive-inductive types available from $.40 up. Model RN — list price $5. Solar Mfg. Corp., 599 Broadway, New York City. — Radio Today SPACE-SAVER CONDENSERS ■*• Midget electrolytic condensers for ultra-compact receivers. Available from 2-16 mfd. in 200 and 450-volt ratings. No sacrifice in service life. Popular where space is at premium or for replacing old condensers with greater capacity or higher working voltage. Size of 8 mfd., 450volt— 2 7/16 x 1% x 11/16 inches. Aerovox Corp., Brooklyn, N. Y. — Radio Today PHONOGRAPH-AMPLIFIER * Portable three-stage amplifier for AC-DC. Output of over five watts. Special hum balancing circuit permits use of push-pull type 48's on A.C. Electric turntable takes 16-inch records. Crystal type pick-up. Eight-inch dynamic speaker separate from turnable and amplifier. Addition of microphone allows for use as public address system. List price $89.50. Ansley Radio Corp., 240 West 23rd St., New York City.— Radio Today DYNAMIC MICROPHONE * High-grade pick-up from 40 to 10,000 cycles, without regard to direction of sound approach. Application of modern acoustic streamline principles results in uniform response both with respect to frequency and angle of incidence of sound wave. Has desirable features of ordinary dynamic microphone but small in size (2% diameter) and lightweight. Used with existing speech equipment at distances of several hundred feet. Graybar Electric Co., New York City — Radio Today September, 1935 53