Radio age (Jan 1927-Jan 1928)

42 RADIO AGE for January, 192! The Magazine of the Hour Use These Coils and Improve Any Radio Receiver SUPER-SENSITIVE INDUCTANCE UNITS TUNED RADIO FREQUENCY KIT $12.00 The Aero Coil Tuned Radio Frequency Kit illustrated above will positively improve the performance of any receiver. Patented Aero Coil construction eliminates radio frequency losses and biings tremendous improvement in volume, tone and selectivity. Kit consists of three matched units. The antenna coupler has variable primary. Uses .00035 condenser. 8 page color circuit, layout and instruction sheet for building the supersensitive 5 tube Aero-Dyne re to wireup for a power tube if desired. LOW WAVE TUNER KIT $12.50 Completely interchangeable. Adapted by experts and amateurs. Range 15 to 130 meters. Includes three coils and base mounting, covering U. S. bands, 20, 40 and 80 meters. You can increase the range of this short wave tuner by securing coils No. 4 and 5. Combined range of 15 to 550 meters. Both interchangeable coils fit same base supplied with short wave kit and use the same condensers. Coil No. 4 price 84.00; Coil No. 5, price $4.00. Get these coils from your nearest dealer. If he should be out of stock, order direct from the factory Aero Products, Inc. Dept. 106, 1772 Wilson Avenue Chicago, 111. Charger tt»*X SATISFACTION GUARANTEED Charges any type of storage A or B battery, using a few centa worth of ordinary house current, either alternating or direct. Cannot injure battery. Complete directions enclosed. Anyone can ope r a t e. No expensive "extras" to buy. Why pay $10.00 to $15.00 for a charger when you can get this splendid GUARANTEED R. B. Charger by mailing us two dollars (bills, money order, check or stampB) plus ten cents in stamps or coin to pay mailing costs. Charger will be sent postpaid. If you are not satisfied, return within five days and we will refund your money. Order at once — TODAY. R.B. SPECIALTY CO. Dept F-2 308 East Third St, Cincinnati, 0. Steam Fire Boat Is Passing Out uT^IESEL electric fire boats A-J are fire fighters of the future," said Daniel H. Cox, one of America's foremost authorities on fire boats, at the 15th Annual Convention of the American Association of Port Authorities, recently in session at Norfolk, Va. "With nearly every community motorizing their fire equipment for the reason that the old horsedrawn apparatus stood idle 90 per cent of its time and the horses stood in their stalls eating their heads off, it is for the same reason that cities owning waterfront property to protect are replacing the out-of-date steam fire boat with the modern and efficient Diesel electric fire fighter. "It might interest you to know," continued Mr. Cox, "that the Port Houston, the first electric fire boat built, which was built for the Harris County Houston Ship Channel Navigation District Commission with the electrical equipment furnished and installed by the Westinghouse Electric in responding to its first fire, which was at a coal dock, a distance of approximately two miles from its station, within twelve minutes from the time the alarm was turned in, the vessel was in position alongside the wharf with its full force of water playing on the fire. "Some of the outstanding features in favor of the Diesel electric over the steam fire boat are that despite the slightly increased capital investment, the operating cost is greatly reduced," said Mr. Cox. "For instance there is no boiler-room force on the Diesel electric tug, therefore the expense for crew is greatly reduced. udio rara ; Amplification The four types thoroughly explained in a fully illustrated booklet 9"x 12". This booklet will be sent to you absolutely FREE if you will send me six cents in stamps to cover cost of handling and postage. W. McMANN 64 Church St., Dept. R. A., New YorkCity oulWave Aerial Give you stations not previously received. Bring in greater distance. Improve tone and selectivity. or Your Money Bade We make these claims without reservation. This famous Gold Wave Aerial rn s been put to thousands of tests. Recommended by all raoio engineers. Broadcasting stations use It for better results. Can't corrode. Gives remarkable results when used on any make Radio set. 7 strands — gold plated — Aerial 100 feet long. Installed like any other aerial. 10 DAYS, TRIAL —SEND NO MONEY Get One at Yoar Dealer'* or Mail Coupon tUXEM & DAVIS MFG. COMPANY Dept. OOO, 6229 Broad-way, Chicago Dealers and Agents Write for Propositions Luxem & Davis Mfg. Co. 6229 Broadway, Dept. A Chicago, III. Please Bend me a GOLD WAVE AERIAL ae described above. I will pay postman $3.00 plus a few cents postagel If lam within 1 WORLD'S FINEST LOUD SPEAKER/ "" GENUINE — "ENSCO" flscONE KIT ONLY. ^ <£-^ _^ .vwh^,,^ V, ,ONLV *m — NO 'i^^V" THE SOLUTION OP TUB PERFECT 9*e Uoux cf&adingTtgineers MAKE TOUR OWN THREE FOOT CONE SPEAKER IN LESS THAN AN HOUR. Complete parts furnished in kit form. We guarantee this speaker the equal of any manufactured cone speaker at any price. With this THREE FOOT CONE SPEAKER you hear all the tones. It brings out tne true depth and beauty of orchestral and instrumental music. Can be operated soft'y for living Room Music or Full polume for dancing, and without trace of distortion. Kit includes famous "ENSCO" cone unit, the only direct-drive, distortionless unit for large cones; Alhambra Fenotex for big cone, with brass apes, two Sepia Prints showing cabinet or simple stand construction. All necessary instructions. Buy this wonderful speaker under our absolute guarantee. Your money back if you are not convinced that it is the finest reproducing medium obtainable at any price. It works on any set, with ordinary Tubes or with Power Output. Send No Money! Write your name plainly as indicated below, then mail and complete kit will be forwarded to you. Just pay postman $10.00 upon delivery. ENGINEERS' SERVICE CO. 25 Church St. (Desk A), New York City jo*^©9 BIG NEW 1927 CATALOG-FREE Dealers, Agents, Set Builders — get our big 1927 Catalog — 225 nationally advertised lines. Lowest prices in America I Largest, most complete stock. Radio's latest developments. It's FREE— send for your copy now. AMERICAN AUTO & RADIO MFC. CO., Inc. 1471 McCee Street, Kansas City, Mo. Please Mention Radio Age When Writing to Advertisers.