Radio Broadcast (May 1928-Apr 1929)

IIS RADIO BROADCAST ADVERTISER Model 537 Makes every required test A. C. and D. C. Set Tester This "Universal" self-contained outfit is all the service man needs for testing every kind of receiver made. No other equipment necessary. The outfit consists of two 3-j" special instruments giving all the required A. C. and D. C. readings under actual operating conditions. WESTON ELECTRICAL INSTRUMENT CORP. 604 Frelinghuysen Avenue, Newark, N. J. WESTON RADIO INSTRUMENTS Order your copy of Radio Broadcast from your news dealer or radio store. Make sure that he reserves a copy for you each month. If your favorite radio store does not stock the magazine write us giving name of radio dealer and address. Resistance for Every Need! Volume Control, Grid Leak, Standard (Universal Range), Power, Table Type, Duplex — there is one for every radio purpose when you use OAROSTAT Reg. U. S. ^^B^^ P»t. Office ] AERO Corona Coil Used in New Cooley "Rayfoto" Of course the new Cooley "Rayfoto" uses an AERO Inductance Coil. This special coil is designed to meet the exact specifications of A. G. Cooley, whose "Rayfoto" receiver so many experimenters will build. For every inductance requirement AERO Coils are proved best — by experts and amateurs as well. Always specify AERO Coils if you want the finest in radio performance. AERO PRODUCTS, Inc. 1722 Wilson Avenue Chicago, 111. Convenient and Reliable The convenience of variable or adjustable resistance has never been questioned. It has been a matter of reliability and noiseless operation. You get both in the i THE HAVEN OF A SEA-GOING AUDION (continued from page nj) thousand miles to the north'ard. Allowing a drift of but a few miles a day, many months must have passed and miles unwound from the point of departure until riding the surf, this tiny glass bulb found rest on the sands at Teraina. Study of other drift material offered the only opportunity for conjecture. Cocoanuts are supposed to have come from Central America and vegetated throughout the South Pacific. While digging an irrigation canal on Washington Island, an old Manahikian canoe was found. It was quite a distance inland from the present shore of the lake and buried in gravel, which undoubtedly was the old lagoon beach, before the present lake was formed by the lagoon's closing. The bow is in good condition and now occupies a prominent position in the Bishop Museum, Honolulu. There are legends told by the old men of Manahiki, about travels to Teraina in great canoes. One tale recites how the King of Manahiki, angered at some of his people who refused to return from Teraina, cursed them and cried for a tidal wave to wipe out the rebel village. The canoe is pointed out as evidence of Manahikian occupation and the closed lagoon as the fulfillment of the curse. Of more recent date is a load of lumber consigned to A. P. McDonald, Tahiti. This must have been washed overboard from some schooner and found its way to Fanning and Washington. Fanning is 75 miles to the southeast of Washington. The lighter pieces came ashore at Washington while all the great, heavy beams piled up on Fanning, without exception. The British Commissioner at Fanning seized the lumber for his new house, quoting a law some hundreds of years old, which claims everything from the sea for the Crown. Standard Oil Barge No. 95 almost foundered off the coast of lower California. Everything on deck was swept away. A year and a half later, one of her steel lifeboats, buoyed by the airtight compartments in bow and stern, majestically floated past our island. An object resembling a human head was visible, silhouetted against the bright noon-day sky. Dave Greig, the overseer, and I were the only ones at the settlement, except the cooks and store boys. Greig launched a small fishing boat and started to run down the visitor. What suspense as I stood on the beach and watched him overtake the lifeboat! Then he gave me the prearranged signal that there wasn't any one aboard. After quite a struggle against the strong current, Grieg succeeded in bringing the boat ashore. We were surprised to find it nearly full of water and with a great many fish of all sizes swimming about. The bottom was filled with fish bones, who had perhaps served as food for later comers. Many of the bones were from large sharks. This craft must have come at least 5000 miles, and as it is highly improbable that it traveled anything like a straight course, the distance must have been many times that. All of this drift has been from the eastward and in each case, except the audion, a point of origin is known. It is possible that the DeForest wanderer started somewhere in the Atlantic, bobbed through the Canal, crossed the Pacific, and came to rest, at last, on the beach at Teraina. This is not any more difficult to believe, than the mere fact that it came out of the sea, over a rocky reef, to the beach — a beach whose entire length is but eleven miles, situated in mid-Pacific where distances are measured in thousands of miles! The cocoanuts, the canoe, the lumber, the lifeboat, and the DeForest Audion — symbols of an age, and slender threads from other worlds — to peaceful, detached Teraina! MICROPHONE THIS SIZE §1.00 Many Radio Sets are now out of date because they do not include the latest improvements. To meet the popular demand and bring a fair price every radio receiver should be made with a microphone transmitter through which to talk* sing, play the piano, violin, phonograph, band, orchestra or any musical instrument by the loud speaker, in the room, or any distance away. No additional coils, magnets, or batteries are needed to make a player radio receiver, or change one that is already made into a player radio, they are already there, and it is only necessary to connect a phone cord to the screw eye on each side of the Baby Mike Transmitter and plug it into the detector circuit as shown in the plain printed directions with each microphone and sent by sealed letter for $1.00. With cord, $1.25. With cord and plug, $1.50. Special socket adapter 50c. extra. Interesting circular free. DONT buy a radio until you hear from us. The ELECTRIC Specialty Co. 309 Phillips St. Box 244 Helena, Ark. This is a good time to subscribe for RADIO BROADCAST Through your dealer or direct, by the year only $4.00 DOUBLEDAY, DORAN & CO., INC. GARDEN CITY, N. Y Build for Permanence — C a t b to e 1 1 FOR CARDWELL TAPER PLATE CONDENSERS (unbelievably rigid-best forshortwaves) and other receiving condensers in many capacities.— TRANSMITTING CONDENSERS for Amateur, broadcasting and commercial use— AIR DIELECTRIC FIXED CONDENSERS — ULTRA HIGH VOLTAGE TRANSMITTING CONDENSERS — Standard or built to fit your exact requirements. WRITE FOR LITERATURE OR STATE YOUR REQUIREMENTS -h &l)e&UenB.CarbtoeU;fHfg.Corp. ^ 81 Prospect Street Brooklyn, N. Y. Dept. B SI IS SHIELD GRID BOOSTER This little device will inject almost undreamed of pep into almost any receiver and is ready for instant attachment. Price assembled $25. Essential parts $17. Write for information on the entire Browning-Drake line, now complete with sets, kit parts, and a wonderful loud speaker. Browning-Drake Corp. CAMBRIDGE, MASS.