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New Equipment
OSCILLATOR COUPLER
A simple, compact and efficient instrument primarily designed for use in superheterodyne circuits. The rotor is arranged to obtain maximum coupling variation and to reduce the loading effect. Made by Silver-Marshall, Inc., 105 South Wabash Ave., Chicago, 111. Price $2.50
THE DYNERGY RECEIVER
With two radio, detector, and two audio is put out with a device which supplies the A, B, and C battery voltage from your lighting current. Made by the Dynamotive Radio Corp., 47 Ninth Ave., New York City
U. S. L. RHEOSTAT Featuring the renewable and adjustable spring contact especially designed for smooth action. Bakelite is used for the base and knob of this new rheostat which merits very favorable consideration. Made by the United Scientific Labofatories, 92 East loth St., New York City
A MEDIUM FREQUENCY TRANSFORMER
Designed to meet the requirements for amplifying frequencies of the order of 30 kilocycles. By shielding, the reaction between stages has been greatly reduced. Made by the General Radio Company, Cambridge, Mass. Price $5.00
KORKER RADIO TOOL
A novel radio tool which combines a busbar bender, an eyelet shaper, a wire stripper, a wire cleaner and scraper, an awl, a reamer and a countersink all in one instrument. The blade is reversible. Made by Korker Products Co., 46 Lexington Ave., Brooklyn, N. Y. Price 50^
THE PFANSTIEHL RECEIVER
Offers a well balanced circuit obtained without introducing appreciable losses. A five-tube set, which produces receptio'n of excellent quality. Made by Pfanstlstfl Radio SeYvTde 'Co., Highland Park, 111. Price $r$o