Radio age (Jan 1927-Jan 1928)

RADIO AGE for September, 1927 47 End Oscillations — Forever! PHASATROLS A True Balancing Device For Radio Frequency Amplifiers. $2.75 Not until you eliminate the squeals of R. F. oscillations can you know what wonderful reception is possible with your set. Phasatrol stops R. F. oscillations, not temporarily, but once and for all! Also simplifies tuning and makes it easy to get distance clear. Ask your dealer. L Write for free hook-up circular for any set or circuit. ELECTRAD To the Man with an Idea I offer a comprehensive, experienced efficient service for his prompt, legal protection and the development of his proposition. Send sketch of model and description, for advice as to cost, search through prior United States patents, etc. Preliminary advice gladly furnished without charge. My experience and familiarity with various arts frequently enable me to accurately advise clients as to probable patentability before they go to any expense. Booklet of valuable information and \ form for properly disclosing your idea free on request Write today. RICHARD B. OWEN, Patent Lawyer 81 Owen Bldg., Washington, D. C. 41-M Park Row, N. V. City .Write for my Big 1928 Radio Catalog -just off the press. Thousands ' marvelous bargains in nation lly advertised goods. All the LATEST IN RADIOS and dia on Radio.^ * V equipment. Lowestwhole Get your copy day. Send postcard American Auto & Radio Home-Made Cooler Cool water for the home, summer cottage, or golf course may be provided by the installation of a simple cooling system. This arrangement consists essentially of an ordinary galvanized iron hot-water tank buried in a horizontal position at least eight feet below the surface of the ground and connected to a drinking fountain or faucet placed at the surface. The tank should be placed so that one end will be slightly lower than the other. The inlet pipe is connected to the higher end. To the lower end, at the bottom, is attached a drain pipe which is used to remove water from the tank during cold weather or when the system is cleaned. The outlet pipe to the fountain or faucet runs from the upper side of the lower end. To facilitate draining, the tank should be placed near an embankment, or near a cellar into which the drain pipe is run. Several coolers of this type have been installed at the Fairlawn golf course near Akron, Ohio. Water from the surface sprinkling system often reaches a temperature near the boiling point, but after being passed through the tank it emerges from the fountain at about fifty degrees Fahrenheit. The most satisfactory size of tank is a 40-gallon one. Where the consumption of water is great, a larger size should be used. It has been found that cooler water will be produced if the tank is buried in clay soil, rather than in sand. BML133 tauten Rid* IMs,Rinn CM* Mi FROST-FONES $3.00 $3.50 FROST-RjiDIO FROST-RADIO DELUXE RHEOSTATS Metal frame and Bakelite Type. Have high overload factor. Resistances wound on flexible Bakelite strip. Metal Frame, plain, $.75 Metal Frame, with switch, S1.10 -*> Metal Frame Potentiometer, $1.00 Eakelite. plain. S1.00 Bakelite, with switch, SI. 35 Bakelite Potentiometer, $1.25 FROST-RADIO BE LUXE VARIABLE HIGH RESISTANCES Vastly improved and infinitely better than any other high resistances. Have highly polished Bakelike cases and dust cover. Two terminal type, plain, $1.76 With Switch, $2.10 Three terminal type, plain, $1.75 With switch, $2.10 FROST-RADIO JACKS FROST CEM-JACS Project only 1 in. back of panel. Self cleaning sterling silver contacts. Hand buffed frame. 40c 45c 50c FROST PAN-TAB JACKS May be used for either panel or table mounting. A heavy, sturdy jack that is precision built in every detail. 65o to 90c FROST ADAPTERS Genuine Bakelite construction, with highest quality No. 540 changes UX199— CX299 to UV base socket, 25o FROST-RADIO BAKELITE SOCKET Genuine Bakelite. with nickel silver contact springs which grip CX CX i i length. For all 4Uo FROST-PLUGS In single and double automatic type, with frames of moulded Bakelite. Single type, 50o Double type, 75o HERBERT H. FROST, INC. Main Offices and Factory ELKHART, IND. Chicago Philadelphia New Orleans Los Angeles New York Pittsburgh Washington, D. C. Boston St. Paul Buenos Aires, Argentina REE RADIO MAP Size 2&X3S inehes with rule for measuring distances. List of radio stations, with call letters, and wave length, b KEE if you send us name and addresses of five friends who have radios and what kind. A. V. VIKING. 124 W. Austin Ave. CHICAGO MAR-CO Illuminated back-panel controls set the 1927 style.