The radio dealer (Apr-Sept 1922)

66 THE RADIO DEALER September, 1922 Scott Detector Complete parts as illustrated. Brass. Nickel Plated Ready for mounting. J^Jg^ ^Qc Manufacturers, Jobbers and Dealers Write SCOTT NOVELTY CO. 33 Springfield Ave. Newark, N. J. NOTE TO THE TRADE: Quote us prices, terms, dis= counts and deliveries WE ARE NATIONAL DISTRIBUTORS Complete sets Radio Equipment SPECIALTIES Manufacturers Desirous of New York Representation communicate at once RADIO EQUIPMENT SERVICE 500 FIFTH AVENUE NEW YORK CITY The "Wave" Antenna Has Materially Reduced Static Interference J. BERNARD Publicity Department Radio Corporation of America The thousands of amateur radio fans, a majority of whom are realizing for the first time what an interference static is to the reception of the various programs broadcasted, will be interested in knowing what means the large commercial companies, such as the Radio Corporation of America, are taking to offset this atmospheric disturbance. Perhaps the chief means used by the Radio Corporation is in the type of aerial. This is known as the " Wave " antenna, which in addition to reducing static interference, has greatly increased the efficiency of trans-Atlantic wireless telegraphy. An explanation of this antenna is best gained by a description of its use at the chief receiving station of the Radio Corporation, located at Riverhead, L. I. This station receives from all European stations which are using wave lengths ranging around 15,000 meters in length, or in other words, electro-magnetic waves each approximately nine miles long. In order to fulfill all of the requirements of the theory covering the operation of the new antenna, it is necessary to have a receiving aerial one full wave length long, or, in other words, a receiving aerial wire miles in length. This is exactly what has been installed at Riverhead. The aerial is nine miles long, and is supported on poles thirty feet above the ground, one end being grounded through a non-inductive resistance, and the other through a variable inductance. With this wire the Riverhead station is daily receiving five different European stations simultaneously without interference. To illustrate the operation of the " Wave " antenna, an engineer of the Radio Corporation of America has drawn the following analogy : "If we look upon the new antenna as a large lake and the wind as the static, we can get an idea how it works. Now, suppose the wind is blowing across the lake from east to west. At the eastern end there will be few or no ripples, but as we get to the western end the ripples will gradually increase in size to full waves. If the shore at the western end is a gentle slope of sandy gravel, the waves will be dissipated and will not be reflected. " If, on the other hand, the shore of the lake is precipitous and rocky, the waves will be reflected and will dis — P A T E N T S PROTECT YOUR INVENTION TODAY Write for 1922 illustrated book free. Radio-Electrical, chemical and mechanical experts ; over 20 years' experience. A. M. WILSON, INC., 309-20 Victor Building;, Washington, D. C. (Successors to business established 1891 by A. M. Wilson) Radio Reception Explained HOW TO BUILD Great Lakes Publishing Company BUILD BUSINESS Sell more parts by creating interest in radio matters. Distribute an inexpensive book which not only explains radio reception but also tells how to build eight separate types of receiving outfits out of parts you are selling. Complete bills of material given for each type listed and described. This will be of great help to your customers and profitable also. List, 50c Sample, 20c Very liberal discounts Desk 4 — Great Lakes Publishing Co., Park Place, Detroit, Mich. Our new catalog is ready -: -: -: M ost complete Radio Catalog published -: -: -: Over 100 illustrations Wholesale and Retail DETROIT ELECTRIC CO. 113 E. Jefferson Ave. Detroit, Mich. Est. 1883 Ask Our Service Bureau Jobbers and Dealers ^ AW Ti A\f\K£ 'WIRELESS RECEM/VS Is The Radio Book of Books This Book helps sell your Supplies and Parts Dealers Make 66 ?3% on Investment One price, any size order. Attractive jobbers proposition. 12 of the best simple diagrams, including Armstrong Regenerative Hook-ups, National advertising, backing it up display material with order. ARCHWAY BOOKSTORE 224 Pike St. Seattle, Wash.