Radio mirror (Jan-Oct 1923)

RADIO D I G E S '1 July 14, 1<J23 FANS SAVE COUPONS FOR LARGER PARTS LETTERS SHOW READERS TO BE SAVING SERIES More Valuable of Standard Apparatus Goal of Special Award Enthusiasts— Many Cash in pilEIIIIIIIIIIllllilllllllDIIIIIIIIIIIIIIllllIll | SPECIAL REWARD OFFER § J Coupon Number 7 H s This Special Reward Coupon = s appears each issue in Radio ^ H Digest until further notice. = ^ When sent in, accompanied §n ^ by necessary remittance, ac Hj ^| cording to the rules govern =| = ing same, apparatus can be s ig secured. See apparatus list S H and rules of offer below. g 1 Save Me — I Am Valuable I . With., the publication of the seventh Special Reward Coupon for Digest readers many letters have been received which tell of the desire of fans to save the coupons for the more valuable pieces of apparatus in the offer list, such as those items catalogued under Classes E, F, G, and even H. Many of these letters also indicate that the writers are saving more than one series of coupons. One fan told that he was saving four distinct series of coupons in order to secure audio and Radio frequency transformers in the Class H list. He is planning a set requiring two audio and two Radio frequency transformers and appreciates the saving made possible by the coupons. It might be added here that there is no limit to the number of series turned in by any fan. Go as far as you like! And again, a series does not have to begin with coupon number one. Any series may begin with any coupon number, so long as it follows a consecutive series of numbers. All that is necessary in addition is the remittance called for in the particular class from which the item may be selected. Rules to Remember One point must be emphasized to those contemplating taking advantage of the special offer; that is, that the coupons turned in for any item must be numbered consecutively, as for example, 1, 2, 3, and 4 or 3, 4, 5 and 6. The number of coupons necessary and the cash remittance, of course, depend on the item sought by the reader. There is no limit to the number of series turned in by any one reader. Another point to Temember is that cash, checks and money orders but no postage stamps will be accepted. To make selection more simple the items have been divided into eight classes, each class depending on the number of consecutive coupons and amount of cash remittance necessary. The eight classes of items follow: Class A Articles For two consecutitvely numbered coupons and thirty cents ($0.30) any one of the following articles will be sent: 1 Carter Imp Jack and Plug; 1 Carter 15-Ohm Resistance Unit; 1 Schindler .00025 mfd. Build-up Mica Condenser; 1 Schindler .0005 mfd. Build-up Mica Condenser; 1 Shindler .001 mfd. Build-Up Mica Condenser; 1 Schindler .002 mfd. Build-Up Mica Condenser; 1 Schindler .0025 mfd. Build-Up Mica Condenser; 1 Martin-Copeland Sta Put Plug; Walnart Standard Tube Socket; Walnart TJV-199 Socket; Ray-O-Vac Dry Battery, lYz volts: Dubilier Micadons Type 601 (.0001, .00025, .0005, .001, .002, .0Q25, .003 or .004 mfd.); Premier Gird Condenser (.00025 or .0005 mfd.); Premier Variable Resistance: 1 Carter 25-ohm Resistance Unit; Standard Socket Adapter for Delta Midget Tube; Blectrad Grid Leak (1, 1.5 and 2 megohms, with clips). Class B Articles For four consecutively numbered coupons ana sixty cents ($0.60) any one of the following articles will be sent: 1 Carter .04 mfd. Special Fixed Condenser; 1 Carter Jack Switch; 1 Carter Hold-Tite Jack, One Spring Open Circuit; 1 Carter Hold-Tite Jack, Two Spring Closed Circuit; 1 Carter Hold-Tite Jack, Three Spring Filament Control; 1 Carter Hold-Tite Jack, Four Spring Closed Circuit: 1 Carter Hold-Tite Jack, Five Spring Filament Control; 1 Pudlin Variable Grid Leak with .00025 mfd. Condenser; 1 Federal Universal Phone Plug; 1 Federal Open Circuit Jack; 1 Federal Closed Circuit Jack; 1 Federal Double Circuit Jack; 1 Martin-Copeland Shur Grip Plug; 1 Martin-Copeland WD-11 Socket; 1 Martin-Copeland WD-11 Adapter; 1 Martin-Copeland UV-199 Socket; 1 Martin-Copeland UV-199 Adapter 1 Martin-Copeland Pull Switch; 1 Martin-Copeland 5-point Inductance Switch; 1 MartinCopeland Variable Grid Leak; 1 Martin-Copeland SPST Knife Switch 1 Martin-Copeland SPDT Knife Switch; 1 Martin-Copeland DPST Knife Switch; 1 Martin-Copeland DPDT Knife Switch; Walnart Variable Grid Leak; Walnart Inductance Switch; Dubilier Micadons Type 600 (.0001. .00025, .0005, .001, .002, .0025. .003, .004, or .005 mfd.); Dubilier Micadons Type 610 (.001, .002, .0025, .003, .004, or .005 mfd.) ; Dubilier Misadons Type 601 (.006 mfd.) ; Dubilier By-Laws Condenser (.1, .25, or 5 mfd.) ; Premier Universal Tube Socket: Premier Radio Dial (3/16, Vi, or 5/16 in. black or white Pace); Premier Universal Radio Jack, Open Circuit; Premier Universal Radio Jack, Two-Circuit Three Spring; Premier Universal Radio Jack. Two-Circuit Four Spring; Premier Universal Radio Jack, Filament Control Three Spring; Premier Switch Lever and 10 Points; Turney Spider Web Coil (SW-20 with .038 milhenry inductance, SW-15 with .066 MH„ or SW-20 with .300 MH). Class C Articles For six consecutively numbered coupons and ninety cents ($0.90) any one of the following articles will be sent: 1 Carter 6-Ohm Vernier Control Rheostat: 1 Carter "Tu-Way" Plug; 1 Federal Panel Mount Socket; 1 Federal 6-Ohm Rheostat; 1 Federal 3-Ohm (Power) Rheostat: 1 Amperite Automatic Filament Control (with mounting); 1 Martin-Copeland Marco Rheostat; 1 Martin-Copeland Series Parallel Switch; 1 Martin-Copeland DPDT Panel Switch; 1 Martin-Copeland 7 -Point Inductance Switch; 1 Martin-Copeland 9-Point Inductance Switch: 1 Martin-Copeland 11-Polnt Inductance Switch; Walnart Variable Grid Leak with .00025 mfd. Condenser; Walnart Variable Condenser (3-plate .00006 (Continued on page 9) LEARN WHILE SLEEPING (Continued from page 1) while previously he had been unable to catch more than twenty or twenty-five words. He advanced the theory that in a few hours of his slumber his subconscious mind had been trained to the higher speed. Flan is Practical When the proposition was first made to apply the test to student naval aviators in the ground school in Pensacola, officials of the Navy Department say that it was met with amused skepticism, but a practical test has convinced the skeptics that the plan is workable. The matter of acquiring a speed of twenty words per minute has ever been a bugbear to students at the training station, it is said, and in a number of cases has seriously hampered their progress. This speed must be reached by the end of the six months' course in order for the student to receive a designation as pilot. In the last class to enter the ground school several students proved to be difficult subjects, and as a last resort the attempt was made to boost them to the required speed by sending radio code messages to them while they slept. Applicable to Other Memory Work Before turning in at night the student adjusts the receivers on his head which are used in the regular class. A regular watch is stood throughout the night by expert operators on the sending key and throughout the night they send at high speed — about ten words in excess of the student's capacity to receive. It has been found, according to the reports reaching the navy headquarters, that in his conscious hours the following day the student is able to receive messages at the speed they were sent to him while he was asleep. In discussing his method Chief Mate Phinney claims that it has educational value in that memory tests which he has made have given astonishing results. Long passages of literature have been committed to memory in this manner that would otherwise have taken laborious effort extending over a long period of time. The belief was expressed that the scheme might be applied to other lines of education and perhaps eventually would find use in the schools all over the country. Cuban Station Owner Gives Long Distance Certificates TUINUCU, CUBA.— Frank H. Jones, owner and operator of station 6KW, Tuinucu, Cuba, has a novel way of confirming the long distance reports of ambitious amateurs who write in to him, reporting reception of his broadcasts and requesting a check on the received broadcast. On receipt of such rep-orts, Mr. Jones checks up the report with the station log and issues a "Certificate of Long Distance Radiophone Reception," stating the date the record was accomplished, wave length used, type of apparatus employed at the broadcasting station, and a schedule of programs. Majority of Radio Exports Go to Canada, Figures Show WASHINGTON, D. C. — There were 128,026 pounds of Radio apparatus exported in April, valued at $244,195, according to information just made public by the Department of Commerce. Of this apparatus, by far the largest quantity went to Quebec and Ontario, Canada, the exports to these provinces amounting to 33,319 pounds, valued at $56,325. The second largest quantity went to Argentina, with Cuba and England being the countries to which the next largest quantities went. Series of "Outdoor" Talks by Jud London, Broadcast SCHENECTADY, N. T.— For lovers of the field and stream WGY, the broadcasting station of the General Electric Company here recently inaugurated a series of "outdoor" talks. Jud Landon, nationally known devotee of the rod and gun, gives red-blooded talks for red-blooded men. He tells about the ways and the haunts of game fish; discusses in the language of the sportsman, such important things as bait, flies, tackle, rod and reel. CONTENTS Radio Digest, Illustrated, Volume VI, Number 1, published Chicago, Illinois, July 14, 1923. Published weekly by Radio Digest Publishing Company, 123 West Madison Street, Chicago. Illinois. Sutscitiption rates, yearly, Five Dollars; Foreign, Six Dollars; single copies. Ten Cents. Entered as second-class matter at the postofnce at Chicago, Illinois, under the Act of March 3, 1879, "All the Live News of Radio" 1 to 8 Drop a Nickel in the Slot — Hear Music 3 Survey of the Radio Patent Tangle, in Four Parts, Part I, by John B. Brady; An Evening at Home with the Listener In 4 "Back Stage" at the Stations 5 Fiewelling Answers to Queries 6 This Week's Advance Broadcast Programs 7 Radiophone Broadcasting Station Directory, Part IV, State, City-Station Index 8 Editorials ; Indi-Gest ; Condensed by Dielectric 10 First Steps for Beginners in Radio, Chapter IX — Radio Frequency Amplification, by Thomas W. Benson : 11 Phantom Circuit for Portable Set; Other Radio Workshop Kinks 12 How to Make a Camper's Portable Reflex Set, Part IV — Conclusion, by H. J. Marx 13 Morrow Double Regenerator; Hazeltine Neutrodyne Errata 14 Questions and Answers 15 Radio Illustrated, a Page of Pictures 16 Looking Ahead Fans of the great A Trip Through WGY — next week with Vera Brady Shipman. Schenectady broadcaster will enjoy this story. How Audio Frequency Amplification Is Accomplished — and many other things about it will be told by Thomas W. Benson next issue in his instructive series for Radio beginners. Read Chapter IX, page 1 I, this week. "Co-operative Competition" in the Radio Industry — will be continued next week by John B. Brady, a patent attorney well informed on the Radio situation. A Photo Diagram of Another Standard Receiving Set this time the Jones Symphony Receiver will be in the July 2 1 issue. The understandable layout will no doubt be appreciated by Digest readers, as have the other photo diagrams of this series. Tube Characteristics of the Northern Electric 21 5 A — -will be discussed by H. J. Marx in the July 21 issue. This little "pickle" tube has acquired popularity over night, scarce as it is. And of Course the Other Regular Features — Fiewelling Answers to Queries, Part I of the Radiophone Broadcasting Station Directory, Advance Programs, etc., will be in your copy of the Digest next week. Have a Copy with You on Your Vacation WHEN YOU WANT Radio Digest YOU WANT IT! BE SURE OF YOUR WEEKLY COPY BY SUBSCRIBING NOW SEND IN THE BLANK TODAY Publisher Radio Digest, 123 West Madison St., Chicago, Illinois. Please And enclosed check M. 0. for Five Dollars (Six, Foreign) for One Year's Subscription to Radio Digest, Illustrated. GIVE WORLD RULES ON RADIO IN WAR NO BAN ON NEUTRAL SETS IN OWN TERRITORY Belligerent Powers May Not Erect Station in Jurisdiction of Country at Peace WASHINGTON.— International rules for the control and operation of Radio in time of war, as propounded by the Commission of Jurists at the Hague, were announced by the Department of State today. These regulations, in the preparation of which Capt. Samuel W. Bryant U S N and Col. Geo. S. Gibbs, U. S. A., assisted American Commissioners Moore and Washburn, provide substantially that: In time of war the working of non-belligerent Radio stations shall continue to be organized, as far as possible, in such manner as not to disturb the services of other Radio stations. Belligerent and neutral powers may regulate or prohibit the operation of Radio stations within their jurisdiction. The erection or operation by a belligerent power of Radio stations within neutral jurisdiction constitutes a violation of neutrality on his part as well as on the part of the neutral power. Neutral Power Need Not Restrict A neutral power need not restrict or prohibit the use of Radio stations located within its jurisdiction, except to prevent the transmission of information destined for a belligerent concerning military operations and except as further prescribed. All restrictive or prohibitive measures taken by a neutral power shall be applied impartially by it to the belligerents. Belligerent mobile Radio stations within a neutral State must abstain from all use of their Radio apparatus. Neutral Governments are bound to prevent such use. The transmission by Radio by a vessel or an aircraft, whether enemy or neutral, when on or over the high seas, of military intelligence for the immediate use of a belligerent is deemed a hostile act and will render the vessel or aircraft liable to be fired upon. A neutral vessel or neutral aircraft which transmits, when on or over the high seas, information destined for a belligerent concerning military operations shall be liable to capture. The Prize Court may condemn the vessel or aircraft, if it considers that the circumstances justify condemnation. Liability to capture of a neutral vessel or aircraft on account of the acts referred to is not extinguished by the conclusion of the voyage or flight on which the vessel or aircraft was engaged at the time, but shall subsist for a period of one year after the act cor plained of. Belligerent Control Over Neutrals In case a belligerent commanding officer considers that the success of the operation in which he is engaged may be prejudiced by the presence of vessels or aircraft equipped with Radio installations in the immediate vicinity of his armed forces or by the use of such installations therein, he may order neutral vessels or neutral aircraft on or over the high seas, to alter their course to prevent their approaching the armed forces under his corrfmand; or not to make use of their Radio transmitting apparatus while in the immediate vicinity of such forces. A neutral vessel or aircraft, which does not conform to such direction, exposes itself to the risk of being fired upon. It will also be liable to capture. Neutral mobile Radio stations shall refrain from keeping any record of Radio messages received from belligerent military Radio stations, unless such messages are addressed to themselves. Violations of this rule will justify the removal by the belligerent of the records of such intercepted messages. Belligerents are under obligations to comply with the provisions of international conventions in regard to distress signals and distress messages so far as their military operations permit. Nothing in these rules shall be understood to relieve a belligerent from such obligation or to prohibit the transmission of distress signals, distress messages and messages which are indispensable to the safety of navigation. The perversion of Radio distress signals and distress messages prescribed by international conventions to other than their legitimate purposes constitutes a violation of the laws of war and renders the perpetrator personally responsible under international law. Northern Electric Peanut Tubes, Type 215A DFAT FR <s ATTRACTIVE UILALZ.KZ DISCOUNTS NOTE: We are the Largest Exclusive Radio Jobbers in the Middle West ,123 W.Madi-ronJt.Chicaqo !