Radio mirror (Jan-Oct 1923)

6 RADIO DIGEST ILLUSTRATED VISITING DAY, CODE PRACTICE AT WGI GIVES FANS CHANCE TO SEE "HOW IT'S DONE" 15-Mimxte Period Daily Introduces Listeners In to DotDash Mystery MEDPORD HILLSIDE, MASS. — A "Eadio Visiting Day" has been established at Station WGI, of the American Radio and Research Corporation here, whereby New England Radiophans may visit the station and see how broadcasting is done, and how a Radiophone plant is operated. People who nightly listen to this or that broadcasting station have a certain curiosity to see what the station and the announcers look like, as well as how the "thing" works. Heretofore, the main reason why the big broadcasters have not invited their audience to visit them has not been because they were not wanted, but because there was not sufficient space to accommodate all those who might care to come. This main difficulty has been eliminated at the WGI studio by a drawing system which, it is believed, will be adopted, with more or less modification to fit local needs, by other broadcasting stations all over the country. Draw from Applications; Broadcast Winners The drawing system works as follows: Those desiring to visit the broadcasting station are invited by Radiophone to make application. These applications are numbered. Then a list of numbers is put in a hat and a drawing is made by a committee. Those numbers selected are the invited guests of WGI at the first convenient date. The visiting plan was first put in operation at the station recently when at 10:20 P. M. Eastern time, Announcer "HDM" broadcast that all letters received before 6 P. M. the next night would be included in the first drawing. Over 500 letters were received, including special deliveries and telegrams. One resident within a few miles of the station came over in person, his automobile being the first to break through the drifts on the street of the broadcasting studio after a heavy snowfall. Code Signal Practice Period Another new WGI feature is its code practice period. A desire on the part of many of the Radio audience for practice in the reception of code signals has encouraged WGI to insert a 15-minute period in its program each evening for this particular purpose. In answer to a query broadcast some weeks ago, asking if the fans desired this instruction, over 300 replies were received and almost as many telephone calls. The Radio audience seems eager to know what the mysterious dots and dashes are saying. One or two letters read; "If we must listen to that darned buzzing, let us know how to interpret them." It is believed that practice in the code will lead many Radiophans now interested mainly in the broadcasting to become real "DX" enthusiasts in amateur work. These lessons are planned for Monday, Wednesday and Friday at 6:15 p. m. Each lesson will be repeated the night following at 6:45 p. m. An article in the New York Times estimates that before the close of the coming winter 3,000,000 Radio sets will be in use and the concerts will have a total audience of at least 50,000/000 persons. Jf "How to build the 41 ReinortzJReceiyer is told, complete with illustrations and diagrams, in the latest addition to our -FREE looseleaf, handbookcatalog now on the press. Amateurs find the Reinartz hookup by far the simplest yet designed. In efficiency it rivals the Armstrong and other wellknown circuits. All the parts necessary for building your Reinartz Receiver are listed in the "ChiRad" handbook catalog — save yourself the trouble of shopping around. Write for your copy today — ask for "Chi-Rad" Handbook, Edition RR. Chicago Radio Apparatus Co. 415 So. Dearborn Street CHICAGO Book Reviews "Vacuum Tune 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 Armstrong 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 T 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 K. 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 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 during the war. The 1922 edition has been revised and enlarged so as to cover the VAR. GRID LEAK The Keystone to FLEWELLING Also Standard Lines DEALERS WRITE FOR DISCOUNTS DUNGAN RADIO CO. Distributors 68 WEST WASHINGTON ST., CHICAGO "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 .UrmIcX ^lajranaedPhfmlicfondcnsaiim Pro duct .SHEETS TUBES BODS RADIO PANELS POLISHED BLACK FINISH CUT PERFECTLY SQUARE TO ANY SIZE V3Z THICK ^2* PER SO. INCH Y\&" THICK YA * PER SO. INCH ^32* THICK K PER SQ. INCH Ye" THICK l!/2< PER SQ. INCH 3/>6" THICK 2* PER SO. INCH VA " THICK Z</2* PER SQ. INCH 3/e" THICK 4* PER SQ. INCH • VZ " THICK 5Y& PER SQINCH LSEND TOR COMPLETE PRICEUST PROMPT ATTENTION TO MAIL ORDERS DEALERS PRICES ON APPLICATION STARRETT MFG. CO. 519 SOUTH GREEN ST. CHICAGO progress made in the last few years. Price, $3.00. The book department of the Radio Digest is prepared to send yon any of the books on Radio published, whether listed in our Book Review or not. Let us know what book you want, send as your check and we will see that the book is mailed to yon. Postage stamps in payments for books not accepted. Send money order or check. Book Department, Radio Digest Illustrated, 123 W. Madison St., Chicago, HI. FOR OR AGAINST? (Continued from page 5) heard, our programs and we invariably and immediately pass all complimentary letters on to the artists -who perform over WOAI, and it pleases these artists, just as applause would from an audience in a hall or theater. "We not only do this, but a great many of such letters and cards axe printed by the San Antonio Evening News and Express, which, in a general way, acknowledges receipt to the sender, but we also acknowledge every letter and card we receive by mail, sending our appreciation and our broadcast schedule. One's Tun Is Bother for Many "We have received many thousands of cards and letters from all over the continent and have them filed by states or countries and we are very proud of them and want more and will appreciate, in the future as in the past, the thoughtfulness ■which prompts anyone to 'write, but we believe the fan also appreciates the fact we should not spoil many people's entertainment by reading each card, in spite of TUNE IN Join our radio dab and save money on sets and parts. Write ns your wants and worries. Radio Supply and Electric Co. 116 West 29th Street, Wilmington, Delaware. C R L VAR. GRJD LEAK ^4 to 10 megohms KLENTZ RADIO CO. Exclusive Distributors 508 South Dearborn St. Room 770 Wabash 1389 Chicago the fact the individual might be interested to hear his name sent .through the air. "Next to almost incessant interference of the amateur telegraph 'worker' — frequently entirely unwilling to co-operate and regardless of the laws regulating his license, if he has one, respecting the wave length be may use and that he should always remember it is unsportsmanlike to unnecessarily interfere with rightful pleasure of thousands — the biggest detriment to and nuisance in Radio is the broadcast station which is constantly indulging in 'horse play' of the nature just mentioned. If we were going to pray together we would request you to join us in a prayer that a remedy for both of these impositions is shortly found." Honor Columbus Council Woman COLUMBUS, O. — Olga Anna Jones, Columbus' first woman member of the city council, was the speaker at the regular forum program of Station WPAL, the Superior Radio and Telephone Equipment company. The broadcast by Miss Jones "was given in connection with a program made up especially for her benefit. Secretary of State Thad H. Brown, also was heard on the Friday forum broadcasting program. KELLOGG SWITCHBOARD & SUPPLY COMPANY Chicago DIO Manufacturer Direct to You SOMETHING NEW EVERY WEEK LOWEST PRICES— HIGHEST QUALITY Everything guaranteed as represented. We pay the postage THIS WEEK'S LEADER Sale on Honeycomb Coils Complete set consisting of 16 coils ranging from <{» 1 "j Att 25 to 1500 turns regular value $18.45. Sale Price . «P 1 *■ •e*0 Fine workmanship and wire on these coils. Here is a real opportunity Lattice Wound Variometers .. . ....... .v $2.95 Lattice Wound Vario Couplers $2.95 50 turn Honeycomb Coils. ......................... .^.^.. • . . . .31c 75 turn Honeycomb Coils 35c Grewol Crystal Detectors .......$ 1 .50 BALDWIN TYPE C LOUD SPEAKER UNITS (with long cord) .$4.65 $4.00 NEW TYPE VARIOMETERS (less capacity effect). (Wooden staters eliminated) $2.95 Freshman Variable Grid Leaks . 75c Potentiometers with taper knob ..$1 .25 W. D. 11 adapters 50c 3 coil mountings with knobs. $3.25 2 coil mountings with knobs. $2.65 Single panel mountings 36c Switch leveTS 1 9c Bakelite V. T. Sockets 42c Rubber knob B. posts 45c doz. 75c 4 phone connectors 42c Vernier dial controls . .42c Two inch dials 19c Complete Partsf or REGENERATIVE CIRCUIT 1 vario coupler, 2 variometers, 1 rheostat, 1 tube socket, 3, 3-in. dials, 6 binding posts, 1 inductance switch, 20 feet connecting <£ 1 -j QPf wire, 1 panel. Complete for «P* *• •*/& AH orders filled promptly. We are swamped with orders from satisfied customers. _ A trial will convince you that we treat you right. Always glad to answer questions or give information. The House of Service and Quality L Moco Products 's Outlet Company 28 South Wells St., Chicago, 111.