Radio mirror (Jan-Oct 1923)

RADIO DIGEST ILLUSTRATED CANADA'S AIR COPS CUT INTERFERENCE 1,850 STATIONS CONFLICT VERY LITTLE Silent Period Observance Keeps Amateur Plants from Jamming Broadcast Phone Programs (Special to RADIO DIGEST) OTTAWA, CAN.— Canada today has 1,800 licensed amateur Radio transmitting stations in addition to the fifty licensed commercial and broadcasting stations. But with this number in the air at various times every day there is little confusion or interference, according to the officials of the Radiotelegraphy branch of the Department of Marine and Fisheries here. Every person operating a Radio outfit in the Dominion of Canada is required to take out a license. Receiving stations are on a flat license rate of one dollar a year an<d these licenses are being secured through the post offices throughout the Dominion. "When sending licenses are issued the licensee is given a specified wave length on which he may transmit. Amateur transmission stations are kept down to a wave length which cannot interfere with the work of commercial and broadcasting stations. Inspectors in Every City of 15,000 In order to check the wave length which the amateur stations are using, inspectors are being appointed in every city that has a population of 15,000 or over. These inspectors have been placed on a part time basis for a small salary and are required to spend their evenings listening in to the various signals and gauging the wave lengths on which they are sent. These inspectors have also been authorized to deal with complaints from receiving stations whose work is interfered with by any amateur sender. Ether-Cops Keep Air lane Clear The first twenty-five of these ethercops, as they are called, have already been appointed and the results have more than justified the efforts by the officials. Amateur senders have cheerfully complied with the new regulations and during the forbidden hours, 7:30 to 10:00 P. M., which are reserved for the broadcasting stations sending concerts and various reports, there has been of late little difficulty with persons who formerly delighted in jazzing up the air to the discomfiture of thousands of Radio fans. The expense of maintaining the ethercop brigade, which is composed chiefly of ex-service men who took up aerial communication work during the war, is more than met by the money received from license fees. New receiving licenses are being issued every day in increasing numbers and indications are that during the last few months more people have taken to Radio than had ever thought of it previously. Jersey "Bug" Gives House Dance with Ohio Music COLUMBUS, O.— -A cheering "pat" on the back for Columbus' newest Radio broadcasting station came recently when C. H. Lane, an amateur of Newark, N. J., called WPAL, the Superior Radio and Telephone Equipment company, Columbus, to tell the operator that a dance was being held at his home to music being broadcast from the Columbus station. He said that he had picked up stations in 14 different states that evening but that the Columbus program was coming in clearer than any of the others. t One of the stations in the East is broadcasting a portion of the works of Nathaniel Hawthorne. The readings are given by Miss Hildegarde Hawthorne, a direct descendant of the novelist. "KNOW WHAT IS IN YOUR SET" EXPERIMENTAL RADIO By E. P. BAMSEY. Ph.D. Professor of Physics, Indiana University A collection of radio experiments for experimenters and students, mimeographed. Tests, calibration, measurements, construction, and use of radio apparatus. Sixty-two tests and exercises. Keferences to all standard books on wireless. Price $1.50. Postage and packing 10 cents. UNIVERSITY BOOK STORE. Bloominqton, Ind. Book Reviews 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 blue print. Price, 75 cents. The Armstrong1 Super-Regenerative Circuit. By George 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. Radio Receivers for Beginners. By Snodgrass and Camp. Answers the universal question, "How can I receive Radio?" Price, $1.00. Elements of Radiotelegraphy. By Elery W. Stone. The text was 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 for the Amateur. By A. H. Packer and R. R. Haugh. The underlying principles of Radio thoroughly explained in simple language and understandable illustrations. This book will teach you how to construct and operate a receiving set successfully. Price, $1.50. Radio Communication. By John Mills. The fundamental principles and methods upon which recent developments are based are emphasized. 'The vacuum tube is treated in a simple, fundamental and upto-date manner. Present methods and tendencies of the art are explained in a chapter which is non-mathematical. Price, $2.00. The A B C of Vacuum Tubes. By E. H. Lewis. Is a book for beginners who have no knowledge of either Radio or electricity and sets forth the elementary principles of theory and operation of the vacuum tube. No attempt has been made in this book to describe all the possible circuit arrangements, but those shown may serve as suggestions to experimenters who desire to evolve their own circuits. Price, $1.00. Experimental Wireless Stations. By S. E. Edelman. This book assumes that the "ALL-AMERICAN" Amplifying Transformers Two years of successful use all over the world guarantees permanent satisfaction. Radio and Audio Frequency. » Send for Circulars Rauland Manufacturing Company 35 South Dearborn Street Chicago FOR YOUR V RADIO Saves you 50% of the usual coat and you get an unconditional WRITTEN 2 YEAR GUARANTEE Beet battery buy on the market today. Thousands of satisfied users. a-Voh 40 Anp '8 s^aVIO1 oo evoi< *<g ^5© 6-Voit %t ASO •OAmp. A4fc=||ioo Amp. &*¥=: Ac* abort omr rnbbtr containers WORLD BATTERY CO. L 60 E. Roosevelt Rd. — Dept L. CHICAGO, ILLS. DELICATE SOLDERING Both the manufacturer's and amateur's problem on all fine work is readily solved by the instrument constructed for this particular purpose. The Post Soldering Iron Platinum Heating Unit -Interchangeable Tips (Large and Small) Universal Current ONE-HALF ACTUAL SIZE Awarded Certificate of Eicelleney, N. T. Evening Mall Badlo Institute From your dealer or write LISTS AT S6.00 Ma7 Kadir^tate"' SJfi.OO ^ From your dealer or write ^^ •*•*•■** ■>*■ POST ELECTRIC COMPANY, ^ SN0EVyoE^2nd St reader has some knowledge of fundamental electricity and mathematics and is a readily understandable text for beginners in the art of Radio communication who desire to start with the elements. Earlier editions of this book were published duringthe war. The 1922 edition has been revised and enlarged so as to cover the progress made in the last few years. Price, $3.00. The book department of the Radio 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 payments for books not accepted. Send money order or check. Book Department, Radio Digest Illustrated, 123 W. Madison St., Chicago, HI. Becomes Gulf Medic Center NEW ORLEANS, LA. — Medical service to vessels at sea will be sent by Radio from Marine Hospital Number 14, via the Algiers Naval Station. The call is NAT. This order, given by H. S. Gummings, surgeon general of the United States Public Health Service, places New Orleans in the position of medical center for Gulf seafarers. Service is free and is intended for ships carrying no ship's surgeon. Broadcasters Delay Meeting CHICAGO. — The meeting of the National Broadcasters league, which was to have been held here in the First Regiment armory, in January, has been indefinitely postponed. The broadcasters had planned to meet in conjunction with the Radio exposition which was scheduled for January and which was also indefinitely postponed. HEAR DAUGHTER SING IN FAR AWAY ATLANTA Parents of Songstress Listen in on Special Concert NEW ORLEANS, LA. — The parents of Mrs. William H. Wrigley, Atlanta songstress, recently heard their daughter's voice borne on the air waves from the Georgia city. The New Orleans Daily States informed hex parents, Mr. and Mrs. Emmett Walsh, of New Orleans, that Mrs. Wrigley and her husband, W. H. Wrigley, also a vocalist, were on the program for the evening, and that the concert was being given especially for the singer's father and mother to hear. Mr. and Mrs. Walsh went to the Daily States office, and heard the program clearly, with occasional interpolations in the voice of Mrs. Wrigley asking, "Marna, are you listening?" Mr. Walsh wired the Atlanta Constitution station, WGM, acknowledging the success of the stunt. In Canada the Royal Canadian Horse Artillery has met with great success in its maneuvers by directing artillery fire from an airplane by means of Radio communication. RADIO MAILING LISTS 12,400 Radio Dealers, eoverinc U.S. by etatei Far M S 7/0 1,614 Radio Mfrs., coverine U. S. by states. Per list 15. 00 1,757 Radio Supply Jobbers, covering U. S. by states, -«,« „• -„ . Per list 15.00 2fi0 'Radio Stations Pet liet «.W 257 Mfrs. who make and assemble complete Radio Sets 25,000 Radio Amateurs & Mire, of Radio Stations. Per M 7.50 Aak for price list coverine Canada and En* land. Send remittance with orda . Trade Crailar Addressing Co., 166 W. Adams St., Chicago, ID. RADIO Manufacturer Direct to You LOWEST PRICES— HIGHEST QUALITY Everything guaranteed exactly as represented or money refunded. We pay the postage. This Week's Leader Supersensitive, newly constructed, design. While we have them, only . 3,000 Ohms Double Headsets hT $3.45 $1.00 VEBNIEB DIAL A A -. CONTROLS «*£© 75C TBIPLE PHONE AOtl CONNECTORS ffcC Screw on binding' posts. PHONE PLUGS worth. $1.00. Our price .._.. SERIES PARALLEL SWITCHES 34c 35c Newest Crystal Receiving Set Not a Toy — 20th Century Wonder — Recently designed after German army type, sensitive and effective for 15 or 20 mile range, entirely new and original. It will pay you to buy one of these just to experiment with. Wonderful results obtained. Includes sensitive earpiece and full instruction for operation and installation. G*A vf C This set tpft.^i-O GREWOL DETECTORS (4 AfF (Fixed) 91 lOO BALDWIN TYPE C UNITS WITH LONG CORD <£A QA (Original) ....^HiOU BATTERY Art** HYDROMETERS „ *tUI# WD 11 Cfl ADAPTERS . l5au, . 9UC 3 COIL CO 9C MOUNTINGS .;I!2E|..^,..*W«63 SOCKETS OH* SWITCH 1 Qa LEVERS !«*# 2 coil eg 4C MOUNTINGS **■••» 9 MOLDED VARIOMETERS, §*A J A $5.50 value «»,»i,*W MOLDED VARIO COUP tt*A Aft LEES, $5,00 value iDtivU COMPOSITION DIALS, AA. 2 or 3 inch. fa&w BAKELITE V. T. A&*% SOCKETS *ft£C RHEOSTATS, condensite 7ft A ■base -tapered knob IOC POTENTIOMETERS, high Q1 AA grade— tapered knob 9nwU VARIABLE GRID LEAKS, A fit* panel type HUH RUBBER KNOB BINDING JE. POSTS, per doz •»5>W look! Variable Condensers look! $4.50 Value 43 plate $1.70 $3.75 Value 23 plate $1.40 $5.50 Value 23 plate with vernier $4.00 $6.00 Value 43 plate with vernier $4.50 $4.50 Value 11 plate with vernier $3.50 $3.25 Value 11 plate $1.25 $2.50 Value 3 plate $1.10 ANTENELLA AERIAL SOCKETS $2.00 value. . .$1.45 We sell quality goods only and at the lowest prices. Don't delay, send your order now, while these low prices are in effect. Manufacturer's Outlet Company Moco Radio Products 53 W. Jackson Blvd., Chicago, 111. _i_