Radio mirror (Jan-Oct 1923)

.; F> 7 7 4 r> S Beginner's Series; 3-Tube Reflex; Flewellin^ Radio Di •Ti EVERY I TEN CENTS BEG. U. S. PAT. OFF. Vol. V Copyright, 1923 " D. P. Co. Inc. SATURDAY, MAY 19, 1923 No. 6 FINDS RARE ORES MOVIE STAR BROADCASTS ON COAST-TO-COAST TRAIN Listeners In Hear Ruth Roland's Message— Shower Her with Bouquets At Stations Along Route (See Photo Below) LOS ANGELES, CALIF.— Ruth Roland, pretty star of the silver sheet, was heard from coast to coast when she recently broadcast from a moving train an invitation to Radiophans to attend the Motion Picture Exposition, to be held during the Station WDAP, Chicago, to Be Entirely Remodeled _ Board of Trade to Construct New Mushroom Antenna jfe. CHICAGO. — Board of trade members and friends of station WDAP on the Drake hotel will have an opportunity of seeing "the wheels go 'round" in a few weeks. The transmitting apparatus, which is being installed in one room, will be glassenclosed, with a runway around the room, so that visitors may see the set in operation. Each part of apparatus will be named and its function explained on a card attached. The new antenna tower 135 feet high is built like a mushroom. NEW INVENTION LOCATES VALUABLE MINING SITES D. G. and Carl Chilson, Inventors, Demonstrate Device Before Board from University of Arizona By F. J. Huntley DOUGLAS, AEIZ. — A Eadio set that promises to revolutionize the mining industry was recently given a successful demonstration before a board from the University of Arizona by the inventors, D. G. and Carl Chilson. The two brothers have At the left if Ruth Roland, star of the silver sheet, who recently broadcast from coast to coast on the "Momus" Special; Miss Roland is A real Radiophan as well as Madge Bellamy, another charming star of the screen. Miss Bellamy (right) recently spoke from Station WJAX Princess Waukomis (below) is a real Indian Princess of Cherokee blood. She was recently heard on a WOR program Monroe Doctrine Centennial at Los Angeles July 2 to August 4, inclusive. When the Momus Special, a Southern Pacific train, sped from the train shed of the Los Angeles terminal station the huge generator on board was turned on and the Pacific coast fans heard the clear voice of Miss Roland issuing them her cordial invitation to come to Los Angeles. This was repeated from time to time, and as the huge Mogul plowed its way across the arid wastes of the great desert other fans came within WOMAN FAN MAKES PRACTICAL RECEIVER ALLSTON, MASS. — Miss Edna Trezice of this place is the first woman Radiophan to design a Radio receiving set. The apparatus is of a very efficient type and is made to sell for $15. It was tried out recently and surpassed all expectations. The circuit was the principal feature designed by Miss Trezice, who is one of the most enthusiastic fans in New England. range and those on the back trail lostout. Upon arrival at the various stations en route the train was met by throngs of enthusiastic fans who had heard the message and Miss Roland was the recipient of numerous huge bouquets and other offerings of appreciation by those who had followed her exploits of the (Turn to page 2) been working on the instrument for the past six years and have now perfected the apparatus to where it will locate valuable sulphide ores without the slightest degree of guesswork. Further experiments and tests will be given. In the set there are the usual triode tubes, two stages of amplification and other parts common to the regular Radio apparatus. The feature is a coil about nine feet in circumference which turns on an axis, at the center of which is a compass level and gradient scale. The coil contains several thousand feet of very wire. The device was tried recently at the Verde Central property at Jerome, Arizona. It is said that as the coil was changed in position the vibrations varied. The minimum of vibrations, the inventors found, occurred directly away from the shaft, and as the coil was (Turn to page 2) LARGEST STATION IN WORLD BEING BUILT AN FRANCISCO. — The most powerful Radio broadcasting station in the world is to be constructed in Oakland, Calif., by the General Electric company, according to an announcement made recently ' by officials of the company. The giant plant is to be located at East Fourteenth street and Fifty-fourth avenue, and will have a range of several thousand miles.