Radio Digest (July 1924-Apr 1925)

KADI O D T G E S T— Illustrated July 12, 1924 ENGLAND PROMISES ETHER MOVIES SOON RADIOPHANS "HEAR" PICTURES IN LONDON J. L. Baird's Scheme Uses Disks Similar to That of C. Frances Jenkins Device in America LONDON". — British Radio movie specialists are experimenting in the transmission of motion pictures by Radio, as is also C. Frances Jenkins in America. Broadcast listeners around London have "heard-' moving' pictures by Radio many times, but few fans, if any, have seen them, because they are not possessed of the proper receiving apparatus. All the listeners heard was a high-pitched, intermittent whistle. Recently a Radio device capable of transmitting motion pictures which can be received on tube sets, similarly to music and speeches, was tested by the inventor, J. L. Raird, operating from a south coast town in England. The transmission apparatus is said to be simple, the object to be transmitted being placed in a beam of light before a rotating, perforated disk. Rays of light then pass through a second rotating disk, and are received on a selenium cell. They are then translated into an electric current. How Movie Receivers Operate Receiving sets will be equipped with another rotating disk equipped with a ring of electric lights arranged in positions corresponding to the holes in the disk of the transmitter. As the disk revolves rapidly, the lamps are lighted by the incoming signals. Earlier experiments in television transmitted a sharp image, but it was subject to flickering. This difficulty has now been overcome, it is understood, through the employment of the revolving disk, and a picture similar to a brush drawing is reproduced at the receiving end. "A cinema picture can be transmitted so faithfully that every movement is reproduced," the inventor states. To insure the dual operation of both the transmitting and receiving disks at exactly the Plain type 3-plate SI. 25, 5-plate $1.50, 13-plate $2, 17-plate $2.50, 23-plate $2.75, 43-plate S3 at dealers. Vernier type; 13plate $4, 23-plate $4.50, 43-plate $5.50, at dealers'. WALNART VARIABLE CONDENSERS They're trouble-proof! Each condenser carefully inspected and given an electrical "breakdown" test before leaving factory. Plates accurately spaced, pressed and everlastingly locked in Bakelite "Makers of good WALNART E Dept. 443 end plates — can't "cut out" or develop looseness as when spaced by wearable washers, solder, etc. Used by the thousands in many leading sets. Ask your dealer first, please. Booklet on request. goods only" IC MFC. ca. CHICAGO same speed, a Radio wave is sent out by the transmitter which is used to regulate the speed of the receiving motor. WHN Serializes a Drama, Part a Day for Six Days NEW YORK. — Serializing a play from the legitimate stage was recently accomplished by Radiocast WHN here to overcome difficulties in installing a direct wire to the Princess theater. The play at the Princess was "The Wonderful Visit," by H. G. Wells, and its serialization at the WHN studio took six days, devoting from ten to twenty minutes each time. This is believed to be the first time a Radario has been seralized. Radio in Portugal Now WASHINGTON, D. C— Authority to install and operate Radio apparatus in Portugal has been given by a recent decree of the Portugese government. Until this action was taken no legal right existed whereby amateurs could install receivers. NEW UNIDYNE RECEIVER (Continued from page 6) transformer is omitted. The values of the component parts used are given in the diagram and as will be noticed are the same as in any of our own circuits for the usual Radiocast reception. In the continuation of this article, details of an amplifier circuit and also a two-tube receiver will be described. (TO BE CONTINUED) Hears 586 Radiocasts on 3-Tube Set; Claims Record ALEDO, ILL. — Glen Peterson, of this city, claims the world's record for Radiocast reception. He has, he says, heard 586 stations on his three-tube set. The finance ministry, in accordance with authority recently granted, has entered into a contract with the Danish Radio Company, Limited, for the erection of four Radio stations in Greenland* AROUND THE WORLD A New Zealand amateur got Alabama (10,000 miles) on one Myers Tube — heard the signals and message perfectly. Certified by Radio News. This remarkable performance indicates that there is no limit to long-distance reception with Myers Tubes because their design is right. Mvers Ttibes Practically Unbreakable add to the efficiency of any set by cutting out noise, tube hiss and "interference. Two types: Dry*Battery and Universal {for storage battery) . Write for free circuit diagrams. Insist on the New Improved Myers Tubes — at reliable dealers — otherwise send purchase price and be supplied postpaid. $ 5 (Actual Size) BACH Complete with clips ready to mount on. your set; no sockets or other equipment necessary. E.B. Myers fo.Ltd. 9Mo I Vacuum V. Tubes: 240 CRAIG ST., W. Montreal, Canada READ WHAT Big Editors Say! The Boston Traveler — This three-coil hook-up provides a combination sensitive, selective and, above all, flexible. Philadelphia Public Ledger — The hook-up that gives long distance, sharp tuning, low cost, volume. New York Evening Mail — A receiver of this type will do everything that the triple honeycomb receiver, the old standby, can do, and more. Pittsburgh Post — The set will be found remarkably selective, free from objectionable noises and easy to control. The set is shipped completely mounted, requiring nothing but simple wiring by our special blue print provided, and is ready to operate in less than an hour. The compact arrangement of instruments is more ingenious than any set ever offered by anyone. Every part is standard goods — high quality throughout. It is a real masterpiece, and looks it. You will enthusiastically agree when you see it. == SPECIAL PURCHASE = For Our Nation-Wide Friends 1 FADA 160 SETS — Genuine Factory Built ^= with Serial Numbers List $120 SPECIAL $ 81 zli SET CONSISTS OP 1 DRILLED 7 x 10 Radion Mahoganite Panel, engraved in Gold. 1 Genuine Ambassador Master 3-Circuit Litzendracht Tuning Coil. 1 Genuine Comsco Bakelite-End Condenser. 1 Triploid Mounting Socket. 2 Premier Hegehog Audio Transformers 4 Brunswick Underslung Foundation Brackets. 2 Brunswick Jacks with Gold -Plated Fronts; 1 for phones; 1 for loud speaker. 1 Freshman Mica Grid Condenser. 1 Standard Glass-En ed Grid Leak. 2 30 Ohm Shackton Bakelite Rheostats. 2 Moulded Mahogany Dials grained to match panel. 5 Lengths Professional Round Bus-Bar. 1 Set of 7 Moulded Engraved Binding Posts completely mounted. 1 Special Blue Print for this circuit. Not an ordinary hook-up, but in clear picture form child can understand and make. Assembled ready to wire, and packed in handsome box, complete. Only $27.95 C.O.I). Send no money. Scori lgCommit tee of I phia, Pa., hears 49 s t a t i o n s from Cuba to Los Angeles sign off in 8% hours Wins Competi 1 tive Distant 1 Test of "New I Yor k Evening World." The only PERFECT score THE NEW DE LUXE AMBASSADOR MAKES NEW RECORD London, England, (2LO) Broadcast checked by radio editors of "Philadelphia Inquirer" heard loud and clear. 50 stations calibrated between points 10 and 89 on condenser dial; 9 between 14 and 20; 11 between 41 and 48. Then logged daily on same points. PLEASE REPORT YOUR RESULTS ACCESSORIES Everything needed to operate after building is listed here — 3 Type 201-A Tested Tubes $11.70 1 60-Ampere Hour Storage Battery $11.25 2 45-Volt Extra Large Enco "B" Batteries $6.50 1 pr. 3000-ohm Head Phones and Cord $3.75 1 Phone Plug, Double $ .90 1 Antenna Equipment $1.50 Complete outfit, $35.60 (Parts Also Sold Separately) SPLENDID CABINET FREE Order Building Kit and Accessory Outfit both together, and we will send Fine Mahogany Finish Cabinet FREE. SHIPPED TO YOU ASA COMPLETE 3-TUBE ASSEMBLY ALL READY TO WIRE AH Mounted as Picture Shows Below Fits Snugly Behind a 7x10 PANEL We also have a SUIT CASE CABINET Space for set, "A" and "B" Batteries and Antenna. Covered with fine automobile leather Fabrikoid, reinferred corners, handle, special convenient doors. A truly elegant, high-class affair that you will delight to own. Additional— SEND NO MONEY We ship C. O. D. Pay your postman. Then enjoy your set under our WRITTEN Money-Back Guarantee sent with shipment. We acknowledge ail orders by return mail. Ship same on following clay. We answer every letter we get — on same day. The Radio Shack are the Largest Radio Dealers in America. No inferior goods. Only the best and most reliable. You buy in safety. Send your C. O. D. order today. Use the coupon NOW. ■ he Radio Shack, Sept. RD712, \ 55 Vesey St., New York, H\ I ■ I Send No Money $1200 LARGEST RADIO DEALERS IN AMERICA Executive Offices, Sept. RD712, 55 VESEY ST., NEW YORK CITY Every Article Sold on WRITTEN Money Back Guarantee Free Illustrated Circular! of "De Luxe Ambassador"! Mark If Here .A. If I have marked a cross in TJPFEU square at left send the De Luxe Ambassador, $2T.05, C. O. D. If I have marked a cross in CENTER square send Complete outfit of Operating Accessories. $35.60. C.O.D. If I have marked a cross in LOWER square send Suit Case Cabinet. $12.(10. Send mahogany finish CABINET FREE if I have ordered set and complete accessories together, everything ordered is subject to .vour WRITTEN Money-Back Guarantee.