Radio mirror (Jan-Oct 1923)

RADIO D I G E S T— Illustrated October 6, 1923 FIRST SALES STUDIO OPENS IN CHICAGO DEMONSTRATION IN STORE INCREASES CUSTOMERS Shop Owner Disproves Theory That Steel Structures Interfere with Clarity of Reception CHICAGO. — "What was said to be the first studio in the United States for the public demonstration of standard Radio receiving sets was opened here recently in the downtown district by the Electric Service products company of Chicago, of which P. C. Moore is president. Unlike other Radio studios it is operated primarily to stimulate interest on the part of the consumer in the ready-made set. A survey under the direction of Mr. Moore had shown, he said, that only five to eight percent of the sets sold in Chicago last year were the product of manufacturers;* the others were assembled by buyers of devices. "Since the opening of the studio our sales have been doubled," said Mr. Moore. Studio on Balcony On a balcony in the rear of the sales room a number of popular receiving sets are displayed. For the comfort of audiences there are divans and easy chairs. The other appointments are in keeping with the purpose of the studio. "From eight o'clock in the morning until 9:30 o'clock at night we keep 'open house,' " Mr. Moore said. "When the programs of the various broadcasting stations are put on the air we tune in, using loud speakers. In a few minutes the studio is crowded by persons attracted from the street. Almost every one is a Radiophan. Twenty-five of every 100 thus drawn are potential buyers of receiving sets." Steel Buildings Do Not Interfere Perhaps the most important phase of the Radio studio in relation to the technique of operation is its dissipation of -the theory that tall buildings of steel construction elevated train structures and other placements of metal necessarily offer interference to selection or reception. "By exercising care and patience we have overcome the usual obstacles to clear reception," Mr. Moore declared. "We received distinctly the returns of the recent Dempsey-Firpo bout. Stations in Jefferson City, Troy, N. Y., Detroit, Davenport, la., Omaha and Minneapolis are heard by our studio audiences almost every night." The aerial which serves the studio is stretched the length of the sales room to the glass front where it emerges at the top and is strung to the top of the building and is attached to a water tank. A fourfoot spreader is used to swing the aerial away from the building. The length of the aerial is about 100 feet. Mormon Messages to Reach Ends of World, Smoot Says SALT LAKE CITY, UTAH. — "The time Is not far distant when leading men of this church will be able to stand in this pulpit and by means of Radio have their message carried to the ends of the earth," declared U. S. Senator Reed Smoot in an address in the Mormon Tabernacle here on Sunday afternoon. It was the greatest tribute to the possibilities ever paid here by a man of national prominence. When at home Senator Smoot is an apostle of the Mormon or Latter-day Saint Church. The Radio filter problem of separating the signals of one station from those of other stations is being studied by a University of Wisconsin professor. Another Columbia Scoop A Geared Coil Mounting for Inside Panel Mounting, made of moulded Bakelite and mirror nickeled brass— for those who prefer their bulky coils on the inside of the cabinet hidden from view. Ask your dealer for it. Ail good dealers stock it. Price $6.00 COLUMBIA RADIO CORP. 157 NO. UNION ST. CHICAGO DAVID GRIMES PAID BIG PRICE FOR IDEA David Grimes, twenty-six years old, blond and rather shy, is the inventor of the Inverse Duplex set for which he has been paid a record price. The exact amount is not yet disclosed. The idea was conceived by Grimes in 1917 when a lieutenant in the United States Air Service Bandit Hunters Are Misled by Tangled Air Message CHICAGO. — Radio failed as a thief catcher recently when several bandits, driving a gray touring car, held up the Purple Grackle, a roadhouse east of Elgin, owned by Attorney Charles E. Erbstein. The alarm was broadcast by Mr. Erbstein's Radio station, WTAS, was caught at Hinsdale, and relayed in such manner as to give police authorities an impression a Hinsdale bank had been robbed. So they watched the roads from Hinsdale instead of from Elgin. WALNART INDUCTANCE SWITCH Why drill ten holes in your panel — not only a difficult thing to do, but if you ever make a change in your hookup, your panel is marred — when by drilling only one hole you can use a Walnart Inductance Switch. Positive contact ; attractive Bakelite knob and pointer make a much more attractive panel, and simpler adjustment. And the price is no more than switch points with pointer lever would cost. Ask your dealer for Walnart Inductance Switch; if he cannot supply, write us. Catalog of Walnart radio accessories and parts on request. WALNART £1 tic nfc. ca Dept. 403, 1251 W. Van Buren St., CHICAGO, ILL. Review of Books An Introduction to Radio. A real book for the amateur. This treatise comes in two volumes. 96 pages in each volume, fully illustrated with flexible leather covers. Price two volumes, $1. How to Retail Radio. A new book telling of tested plans and methods and policies for the dealer in Radio. Financing, location, store equipment and arrangement. Price, $2.00. Vacuum Tube Receivers. By O. F. Heslar. A book that tells how to make a simple set. How to make the cabinet. It includes a 27 by 36-inch layout blueprint. Price, 75 cents. The Armstrong Super-Regenerative Circuit. By George J. Eltz, Jr., E. E. This is a De Luxe edition of this famous circuit. Profusely illustrated and fully explained. Fifty-two pages. Price, $1.00. Home Radio — How to Make It. By A. Hyatt Verrill. This book is particularly adapted for the amateur who desires to know how to make Radiophones. Twelve full page illustrations and diagrams. Price, 75 cents. Elements of Radiotelegraphy. By Elery W. Stone. The text wTas written for the guidance and instruction of Radio students in the communication service of the Navy. It is an instruction book for Radio schools. Price, $2.50. Radio Reception. By Harry J. Marx, Technical Editor Radio Digest Illustrated, and Adrian Van Muffling. A simple treatise on Radio reception. Beginning with the elementary principles of electricity it carries the reader or. into the essentials of Radio telephony. The most successful methods of Radio reception are explained and special reference given to practical tuning. Price, $2.00. The book department of the Radij Digest is prepared to send you any of the books on Radio published, whether listed in our Book Review or not. Let us Know what book you want, send us your check and we will see that the book is mailed to you. Postage stamps in payment for books not accepted. Send money order or check. Radio Book Department, Radio Digest, 123 W. Madison St., Chicago, 111. B-T VERNIER TUNER ADOPTED— RECOMMENDED By 40 Largest Jobbers Within the last thirty days forty leading radio jobbers witk credit ratings of $100,000 or more, seventeen of them with ratings of $1,000,000. have rushed the BremerTully Vernier Tuner into their catalogs at the last moment. They recommend and catalog only the best ra *^-^g-»_> WS^ dio equipment ^^* * \v Here's why they catalog V B-T Vernier Tuners: 1. It's the best Beinartz Tuner available. 2. It gives better control and maximum results on any single circuit regenerative, any of the ultia-audions or practically any of the reflex circuits, including Hazletine. 3. It's easy to change — ideal for "try-outs." Liberal discounts to jobbers and their dealers. Price $5.00 Postpaid. (But ask your dealer first.) Send for one today. Hook it up and you'll understand. BREMER-TULLYMFG.CO. 532 South Canal Street, CHICAGO, ILL. The Reader's View Kellogg Radio Equipment For Better Results Transformers Kellogg transformers I are designed to overcome defects of existing types and to furnish distortionless amplification of all audio freq u e n c i e s . Built complete by the Kellogg Company, using highest grade wire, maroon enameled metal case, and molded Bakelite top. The primary and secondary binding posts are accessibly placed on top of the transformer. These binding posts are plainly marked, so that there need be no error in assembling. Every Kellogg transformer is thoroughly tested before leaving the plant, and we guarantee the purchaser a product of exceptional efficiency. No. SOI Ratio VA to 1 $4.50 No. 502 Ratio 3 to 1 4.50 KELLOGG SWITCHBOARD & SUPPCT COMPANY 1066 West Adams Street;, Chicago, Illinois Purpose of the Variocoupler Just a few lines to let you know that I have read your latest Radio Digest and am writing this letter as a flare-back to that of C. S. Wymore, Nebraska, under variocoupler winding. I wish to say for his benefit and others like him who read and misinterpret articles that they want to be sure they are right before they "holler." In 1921, I was one of many interested but "dumb" Radiothans. Then I took Radio Digest. At present, after 1 year and 6 months, by following the advice of the editor and his staff I can build and have built most all the circuits published in Radio Digest. Perhaps Mr. "Wymore does not really know the purpose of the variocoupler. He would not mention the Flewelling and 3 circuit in the same breath if he did.— Joseph G. Gormley, Philadelphia. Experience with Nacireman E. P. Parker's article on the Nacireman hook-up in Radio Digest, August 11, was read with interest. I will give you my experience with the hook-up, using a variocoupler with 48 turns on the stator, tapped every 8 turns, 52 turns on the rotor, a Cunningham 301-A tube with 67% volts on the plate, aerial 100 feet total with lead-in. (I live 30 miles east of St. Louis.) The first station tuned in was WGY, 820 miles away; it came in as strong as the smaller St. Louis station. Next came WPAD, WHAS, WLAG, WSB, WWAY, WSAI, WW J,' WMC, WDAP, WFAA, WO AW, WBAP, WJAZ and WDAF; all were heard in one evening. The secondary variable condenser plays a very important part in DX work. However, local stations may be tuned in without it.— Otto Steffens, Trenton, 111. Radiophone installation and use are taught by correspondence by the University of Wisconsin Extension division. Every Question ANSWERED for only $1 At last you have under one cover a Complete Radio Handbook JUST OUT 562 PAGES Compiled by HARRY F. DART, B.S.E.E. Formerly with tie Western Electric Co., and U. S. Army Instructor of Radio. Technically Edited by F. H. DOANE NO more need you turn from book to book, hoping to find what you want. It is all here, in 562 pages crammed full of every possible radio detail. Written in plain language, by engineers for laymen. Clears up the mysteries, tells you what you want to know. A complete index puts everything within your reach in a few seconds. IT EXPLAINS: Electrical terms and circuits, antennas, batteries, generators and motors, electron (vacuum) tubes, every receiving hook-up, radio and audio frequency amplification, broadcast and commercial transmitters and receivers, super-regeneration, codes, license rules. Many other features. Under one cover. Yes, it is all in one volume of 562 pages of clear type with hundreds of diagrams and illustrations. Takes the place of eleven or more specialized texts, each costing from two to ten times the dollar you pay for this single book. Belongs in every radioequipped home, on every amateur's table. Send $1 to-day and set this 562-page I.C.S. Radio Handbook — the biggest value in radio to-day. Money back if not satisfied. — TEAR OUT HERE — — — r, I INTERNATIONAL COBBESPONDENCB SCHOOLS | Box 8277 B, Scranton, Penna. I enclose One Dollar. Please send me — postpaid— the 562-page I. C. S. Radio Handbook. J It is understood that if I am not entirely j satisfied I may return this book within Ave I days and you will refund my money. j i ' iNanw „ J I J Address -!