Radio mirror (Jan-Oct 1923)

June o, ipjy RADIO D I G E S T PILOTLESS FRENCH PLANE PROVES SUCCESS Top photo, two gyroscopes which kept plane on even keel. Center photo, party in charge of experiment, left to right: Capt. Boncher, M. Pescheron, M. DeMarcay, M. Laurent Eynac, Capt. Arbanere. Bottom left, plane in flight Photos by Topical Press, London SPECIAL OFFER LIST (Continued from page 2) (5-Plato .0001 mfd.); Bay-O-Vac No. 4131 B Battery, 22}*. tolls; Bay-O-Vac Dry Battery, 3 cells 4H volts; Elwtrad Variohm, with mica condenser; Dubilier ByPass Condenser (2 mfdO ; CRL Variable Grid Leak with Condenser. Class E Articles For ten consecutively numbered coupons and one dollar and fifty cents ($1.50) any one of the following articles win bo sent: 1 Carter 6-Ohm Automatic Bheostat; 1 Carter 20 Ohm Automatic Control Bheostat; 1 Declma 3-Plata Variable Condenser; Waluart Variable Condenser (13-Plate .00025 mfd. i ; Bay-O-Vac Dry Battery, 4 cells 1% yolts; Dubilier Variodon (.0001 or .0006 mfd.). Class F Articles For twelve consecutively numbered coupons and one dollar and eighty cents (SI. SO) the following will be sent: 1 Acme Pot-Bheo (potentiometer and rheostat); Walnart Variable Condenser (23-Plate .0005 mfd.); Bay-O-Vac Xo. 2151 B Battery. 22t£ volts; Dubilier By-Pass Condenser (3 mfd.); Premier Variable Condenser without dial (.00039 mfd.). Class G Articles For fourteen consecutively numbered coupons and two dollars and forty cents ($2.40) any one of the following articles will be sent: 1 Federal 7-Plate Variable Condenser: 1 Federal 11-PIate Variable Condenser; 1 Federal 21 -Plate Variable Condenser; 1 Federal Anticapacity Switch; 1 Democal Variable Condenser 11-Plate; Walnart Variable Condenser (43-Plate .001 mfd.); Dubilier Variadon (.001 mfd.): Dubilier By-Pass Con denser (4 mfd.) ; Premier Variable Condenser with dial (.00078 mfd.). Class H Articles For sixteen consecutively numbered coupons and three dollars ($3.00) any one of the following articles will be sent: 1 Federal Audio Frequency Transformer Xo. 223 \\": 1 Demcal 23-Plate Variable Condenser; 1 Acme Audio Frequency Transformer; 1 Acme Badio Frequency Transformer (B-2, B-3, or B-4) ; Walnart Variable Condenser (13-Plate vernier; Walnart Variable Condenser (23-plate vernier) ; Bay-O-Vac Xo. 2301 "B" Battery 45 volts: Bay-O-Vac Dry Battery. 6 cells 1H volts; Dubilier Duratran (B. F. transformer); Premier Micrometer Variocoupler with dial; Premier Variable Condenser with dial (.0015 mfd.) ; Premier Variable Condenser with vernier (.0004 mfd. K WJAX Gives Condensed News CLEVELAND, OHIO. — WJAX the boadcasting station of the Union Trust Co. here has augmented its regular program of financial and stock reports with a condensed report of all important news of general interest. The reports will be furnished by the Cleveland News. Sunday Evening Club Suspends CHICAGO. — Concluding services of the Sunday Evening club prior to the summer adjournment were broadcast from Orchestra hall by Station KTW Sunday. The services will be resumed October 7. Delicate Soldering Both the manufacturers' and amateurs' problems on all fine work are readily solved by the instrument constructed for this particular purpose. THE POST SOLDERING IRON Platinum Heating Unit — Interchangeable Tips — Universal Current (Large and Small) J/* W OXE-HALF ACTUAL SIZE tf\ Awarded Certificate of Excellency, N. Y. Evening Mail Radio Institute \J From your Dealer, or write POST ELECTRIC COMPANY (Dept. 509), 30 E. 42nd St., New York RADIO PILOTS PLANE (Continued from page 1) M. Pescheron, engineer in charge, and Capt. Arbanere, the pilot, were passengers in the plane during the flight, but were there only to observe the control and land the ship in case something should go wrong. The success, however, proved so great that they did not touch a control during the take-off, flight, or landing. The builder and inventor of the plane is M. De ATareay, famous French aeronautical and Radio engineer. He is said to have negotiated the sale of his invention with the French government. Description of Plight The machine has been made almost automatic, a button on the ground controlling by Radio only the ascent, the descent and turning movements. Everything else was automatic. Stability was obtained by gyroscopes connected with auxiliary motors by means of cogs. In landing, the machine when ten feet from the ground, automatically righted itself and shut off the motor. After it had touched the earth the engine started again and the machine ran along the ground. The aeroplane after leaving the ground flew over the aerodrome exactly like one driven by a human pilot, and landed without mishap amid the cheers of the spectators. War Use Visualized War use of the pilotless, Radio-controlled plane unfolds unlimited possibilities. Photographic record could be made of the entire enemy front without endangering a pilot's life, or if the pilot were wounded, the Radio-control would bring the plane and pilot back behind the lines in safety. Bombing expeditions could be carried to the limit with the new invention. Tons of explosives might be dropped on enemy ground while one pilot at the Radio control key, on the ground, could direct the entire squadron on the bombing expedition. SUMMER PHOTOGRAPHS? EARN A DOLLAR— SUMMERTIME means summer pictures. You and your camera can earn a dollar by sending the Digest out-of-door photos involving the use of Radio in camp, the automobile, swimming, boating, canoeing, on the hike, playing golf, etc. Send such photographs with, negatives and a few descriptive words. Including a stamped, addressed envelope so that unsuitable pictures may be returned. SUMMER PHOTO DEPARTMENT, Radio Digest, 123 W. Madison St., Chicago. SMUGGLES SET TO HIS BEDSIDE IN HOSPITAL Patient, Suddenly Taken 111, Determines to Hear Wife Sing BOSTO.V, MASS.— Stephen O'Neill of Dorchester is the most envied patient at the Boson City Hospital. He is the only one in that institution to have a Radio set to while away his time while undergoing treatment. Although the hospital authorities now know taat his Radio has been installed, it was not for several days after it came in that they discovered it. The set is now enjoyed by all the patients in the ward from time to time. O'Neill had a special reason for having the set brought in to him and quietly connected up, for he wanted to listen to his wife's singing broadcast from the Shepard Stores station, WNAC, recently. She and her husband were recently scheduled for a musical program at WNAC in connection with the Young Men's Catholic Association Glee Club, but just before the event Mr. O'Neill was taken seriously sick and rushed to the City Hospital for an operation. Not to be beaten by sickness, he decided to hear the program at all costs, and with the assistance of friends secured the set and secretly installed it near his bed. The trick is in the Coil NO STORAGE BATTERY REQUIRED Xo Badio Frequency Transformer used. Not Super but DOUBLE Beflex Begeneration. \\ orks local without antenna or around, and brings in the •FAB AWAT ONES" With more volume than you ever thought one tube could deliver. Money Order for 25 cts. brings easy to read diagrams and all information. Address: JACK PRATT 508 Railway Exchange Bldg., Chicago, Ml. P. S.: Its Radio Golf Record is 119,000 miles. First Trial Picked Un Havana from New York Amateurs experimenting with Radio sets should never tinker with house lighting circuits or other high voltage systems. PREMIER "MICROMETER" VARIOCOUPLERS Cure the New Wave Length Troubles $5.00 COMPLETE WITH DIAL A HIGHLY SELECTIVE YARIOCOtPLER having ISO-degree orientation and 20 Antenna tans which facilitate very sharp tuning. Wound with No. 21 single silk or black enameled pure copper wire. Eighty turns on stator — fifty-five on rotor. Wave lengths range from 1 50 to 750 meters. All metal parts brass — contacts positive — stays "Put" at any angle. Adaptable for either single circuit or loose coupled tuned plate hook-ups. Bakelite button on each tap wire permitting easy and safe soldering. Our Complete Parts Bulletin on request. DISTRIBUTORS — We make a most complete b'ne of Radio parts. Some territory open for live, responsible concerns. PREMIER ELECTRIC COMPANY Manufacturers Est. 1905. 3810 Ravenswood Avenue, CHICAGO, ILL. many others, simple and elaborate, fully diagrammed and explained. Used continuously by thousands of Radio fans, both amateurs and professionals. The greatest book ever published for experimenting. Keep this valuable little book before you at all times. Send your check or money-order for one dollar and the book will be mailed to you. Forty-seven hook-ups, all different. Send your order today. The edition is limited. Book of Hook-ups, $1 .00 ELS RADIO COMPANY Randolph Building CHICAGO, ILL. Special Offer to Dealers