Radio age (Jan 1927-Jan 1928)

RADIO AGE for October, 1927 39 FROST-FONES $3.00 $3.50 FROST-RADIO DELUXE APPARATUS No. 611 Adapter 60c No. 640 Adapter 25c Gem Jacs 40c 45c 50c Pan Tab Jacks 65c to 90c Cord Tip Jacks, per pair Loop Plug $1.50 Plugs 50c 75c Switches 30c 50c d Clamp 30c Extension Cords $2.00 to $5.50 Jack Switches 65c to 95c Jac Boi $2.50 Your Dealer Has Frost-Radio Ask your dea De Lu Frost-Radio i them in stock glad to ei promptly. HERBERT H. FROST, INC. Chicago Philadelphia New York Pittsburgh Boston St. Paul New Orleans Los Angeles Washington, D. C. Buenos Aires, Argentina Itffl a k Write for my Big; 1928 Radio Catalog; -just off the press. Thousands ! marvelous bargains in nationally advertised goods. All the encvclooe-T « V LATEST IN RADIOS and df. ton ^adioX^V<lui?men.t LOW63t Wh°le MlaboutlroublellndlDc>C ^>kXBaIe Prices. FREE Log , Call Book i alog. Get your copy t day. Send postcard American Auto 41 Radio hit Ms" l°*T*iOGl fe NEW YEAR NEW IDEA jU ^m I PATENT YOUR I0EA5 ^H ■T FREEinventors Recording Blank j| f^ Confidential Advice Send Ske'.ch ^T Z H POLACHEK Re« Patent Attorney L. tl. rUUftiltn Consult. Engineer ■aaa* 1234 Broadway , new YORKaaaaal tennis, handball and other favorite recreations. A body kept hard by outdoor life, covered with loose clothing and given sufficient rest has the greatest known preventives against a tendency to circulatory asthenia. Before making a flight dietary indiscretions must be avoided and liquids limited to reduce kidney stimulation from cold. Poisoning by dope presents a health hazard. Amyl and butyl acetate, gasoline, denatured alcohol and cellulose make up the standard dope used on the surface of fabrics, covering the wings and bodies of airplanes. These are dangerous chemicals. Their concentrated fumes produce headaches and nausea. Death may occur suddenly with symptoms of vertigo. Soluble dope reaching the bowels is best eliminated by a persistent milk diet. Another recent addition to aviation hazards has resulted from the employment of ethyl fluid which has as its base tetraethyl lead. Danger of lead poisoning requires the usual precautions taken in the lead trades. Aeronautics in its progress is incorporating the modern equipment of technology and psychology, as well as preventive medical principles. The flight surgeon should keep him men physically and mentally fit to fly. He should know his men intimately and be quick to recognize any condition which the flyer himself may not think important. Length of Flying Life Every aviator should be examined every six months and after every illness. This will greatly prolong his usefulness. The English found during the early part of the war that stress of work at the front meant a limited amount of work in the air ; that the limit of every flyer was approximately 150 to 300 hours. At the end of the war these figures were greatly improved and now they are better still. Lindbergh has spent around 2,000 hours in the air. The International Medical Requirements for Air Navigation have been adopted by practically all countries except the United States. The requirements of our Army and Navy are along the same lines. The medical requirements are stricter for pilots engaged in public transport. They are all required to be examined every six months. The civil flight surgeon is the man of tomorrow. Aviation medicine is a specialty and only those with special training are qualified to make special examinations. With civilian transport companies carrying both passengers and freight; with the air full of commuters, the civilian physician will need to know aviation medicine. There are opportunities now for him. There is no doubt that we shall all want to fly. Ernest L. Smith, Emory B. Bronte and Lieuts. Lester J. Maitland and Albert F. Hegenberger tested the radio beacon as a guide to a diminutive goal in the sea to prove that we can fly anywhere. The trans-Atlantic fliers tested engine-endurance to prove it. Lieut. Al Williams is trying to show how fast we can do it, and Lieut. James Doolittle, by his amazing outside loop, has shown how sportively we can fly. The world is moving on at a great rate toward our getting up over the traffic ■NEW/ TrfORDARSOlj POWER SUPPLY TRANSFORMERS Here is a power unit that will satisfy the ever increasing demand for improved quality of reception. A split secondary 550 volts either side of center, makes possible full wave rectification, using two 216-B or two 281 tubes. Current capacity, 130 milli-amperes. The low voltage secondary, 7 }4 volts, will supply two UX-210 power tubes, enabling the use of push-pull amplification in the last audio stage. The Double Choke Unit 2099 is designed for this power unit. Contains two individual chokes of 30 henries, 130 milli-amperes capacity each. T-2098 Transformer, 4K"x5X"x5K" List Price T-2099, 3J<"x4# $2000 Choke Unit, i 'x5^i" List Price 14° The new R. C. A. and Cunningham A. C. filament tubes will be very popular with the home constructor this season. The Thordarson Transformer T-2445 is designed especially for these tubes. Three separate filament windings are provided. Sec. No. 1, \yi volts, will supply six UX-226 amplifier tubes. Sec. No. 2, 2K volts, will supply two UX-227 detector tubes. Sec. No. 3, 5 volts, will supply two 5-volt power tubes. In addition to the above, this transformer is equipped with a receptacle for the B-supply input plug. Supplied with six-foot cord and separable plug for attachment to the light circuit. Transformer in compound filled, crackle-finished case. Dimensions : 2 f£"x5 X"x4 %"• A. C. Tube T-2445. Supply, $irvoo List Price ±1/ THORDARSON ELECTRIC MFG. CO. World's Oldest and Largest Transformer Makers Transformer Specialists Since 1895 500 W. Huron St. Chicago, III.