Radio age (Jan 1927-Jan 1928)

40 RADIO AGE for January, 1927 The Magazine of the Hour Cant tunc'om out? TRY a Micadon 601 in series with the antenna of your set, if you find it hard to "tune out" nearby stations. The Micadon will have the same effect as "loose coupling," and the selectivity of your set will be greatly improved. Capacities from .0001 to .0005 mfd. may be used — you will find a full explanation in our 32 page booklet, " Seventeen Ways to Improve Your Set." Micadons, because of the patented principles of low-loss insulation and protection against variation in capacity which they embody, are a vital element in the improved reception of thousands of radio sets. The tone, the efficiency, and the satisfactory operation of your set depend on the quality of the fixed condensers used. If you want to be sure that your set will do all it was meant to do, be sure that the fixed condensers bear the name of Dubilier. Send 10c in stamps or coin for your copy of "Seventeen Ways to Improve Your Set." Dubilier CONDENSER AND RADIO CORPORATION 4377 Bronx Blvd., New York, N. Y. Washington Monument Does a Radio Shimmy (Continued from page 17) tinuous waves were transmitted, these being chopped by a commutator connected in the filament center tap. "As a result of these observations," summarizes Mr. Dunmore of the Radio Laboratory of the Bureau of Standards, "it appears that there is induction or radiation from most metallic objects so that a radio directionfinder placed in the immediate vicinity gives ^n erroneous indication of the direction of the transmitting station. The magnitude of this distortion depends greatly upon the wave length. "For this reason, it is always advisable to detune or open circuit any antennae which are in the immediate neighborhood of a direction-finding station. It also seems doubtful whether burying wires near the receivingstation is sufficient to avoid all distortion. "In general, the distortion decreases to a negligible amount at a distance away from the disturbing object about equal to its largest dimension. White Paint Cooler THE Bureau of Standards, Department of Commerce, was recently requested to devise a method for preventing the excessive heating of gas balloons in sunlight, it has been announced. Previously, it was pointed out, the Bureau had conducted tests showing that radiators in homes radiated more heat when painted with certain kinds of paint and, conversely, tents painted with different kinds of paint would bar heat from the interior. The information gained from these early tests, stated the Bureau, was an aid in solving the problem of devising a method for preventing the super-heating of gas balloons. The outer surface of the top and sides of the balloon, should be painted white. Two -Year j Guarantee Bond in Writing Famous the world over for reli-~ able.enduringperformance. Solid Rubber Case lasting protection against acid or leakage. Approved and Listed as Standard by Leading Authorities including Radio News Laboratories, Popular Sci. Inst. Standards, Pop. Radio I • Labora Lefax, Send No Money Just state number wanted and we will ship same day order is received, by express COD. Pay expressman after examining batteries. 5% discount for cash with order. Remember, you savo 50 % on World Batteries— so send your order today. WORLD BATTERY COMPANY Dept. 36 1219 S. Wabash Ave., Chicago, III. 6Volt. 100Amperes S10.00 6-ToIt. 120Amperes Solid Rubber Case Auto Batteries 6 -Volt, 11 -Plate iio.oo 6 Volt, 13 Plate S12.00 12 Volt, 7 Plate Id Storage Bat. StationWSBC. AMPERITE, the only self-adjusting filament control, regulates the tube current that governs these vital points. Eliminates hand-rheostats, simplifies set-wiring. Accepted as standard equipment by every leading engineer, AMPERITE is specified in all the feature circuits in this issue— World's Record Super 8 and Samson Dual TC receiver. Write for FREE COPY of "The Radiall Book" to Dept. R. A.-l. ^^^diatl Gompatiy _ 50 FRANKLIN ST., NEW YORK JVMPEMTE, 7he "SELF-ADJUSTING" Rheostat Mailing Lists Will help you increase sales > Send for FREE catalog ffivlnfif count* 1 prices on thousands of classified j«aof yourbest prospective custom _._.-Natlooa1, State an dXocal-lndlvld uals. Professions, Business Concerns. -Gould co.SSStLouis Please Mention Radio Age When Writing to Advertisers.