Radio mirror (Jan-Oct 1923)

RADIO DIGEST — Illustrated August 18, 1923 13 PARTS OFFER SPURS MECHANICAL WORK INQUIRIES DENY CRITICISM OF SYSTEM IN SCHOOLS Interest Shown by Youth in Constructing Sets Shows Advance Toward the Manual Arts | SPECIAL REWARD OFFER j ■ Coupon Number 12 j§ f= This Special Reward Coupon jj s appears each issue in Radio s B Digest until further notice. ^ b "When sent in, accompanied |i b by necessary remittance, ac m g cording to the rules govern =g s ing same, apparatus can be m ^ secured. See apparatus list s ^ and rules of offer below. g 1 Save Me — I Am Valuable 1 Those who rail against what they call the lack of mechanical training in the public and other schools of this country w ould find little with which to bolster their contentions in the answers to the special parts offer of Radio Digest. Many if not most of the inquiries concerning the offer are from boys and girls of school age who by their interest evince marked tendencies in relation to delicate machinery. Construction of Radio sets by the youth of the United States will, it is said by observers, aid, too, the instruction of mechanical drawing. It would be well to remember that when you send coupons to this office they should be consecutive; they need not begin with Number 1 but they should run in order. Tou may send as many series and as many coupons as you want. Write plainly the names of the parts you need, send the money and the coupons and we will do the rest. Boles 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 remember 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 consecutively 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 UV-199 Socket; Bay-O-Vac Dry Battery, l%r volts; Dubilier Micadons Type 601 (.0001, .00025, .0005, .001, .002, .0025, -.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; Electrad Grid Leak (1, 1.5 and 2 megohms, with clips) ; Amsco 3-inch Dial; Amsco Inductance Switch; Freshman Micon Condensers, (.00005, .00025, .00035, .0005. .001, .0015, .002, .0025, or .003 mfd.); Teleradio V. T. Socket; B-Metal Mounted Crystal; Aerovox Lightning Switch; Aerovox Series Parallel Switch; Aerovox Contact Lever; Na-Ald Small Space Socket; Se-Ax-De Vernier Adjuster; Basco Switch Lever Assembly. 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, .0045. .003. .001. or .005 mfd.); Dubilier Micadons Type 610 (.001, .002, .0025, .003, .004, or .005 mfd.); Dubilier Mlcadon Type 601 (.006 mfd.); Dubilier By-Pass Condenser (.1. .25, or .5 mfd.) ; Premier Universal Tube Socket; Premier Radio Dial (3/16, Vi. or 5/16 in. black or white face) ; 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-10 with .038 milhenry Inductance SW-15 with .066 MH., or SW-20 with .300 MH.); Amsco 6-Ohm Rheostat; Freshman Fix-0 Grid Leak and Condenser; Freshman Variable Resistance Leak (with or without condenser) ; Freshman Micon Condensers (.006 or .005 mfd.); Teleradio 6-Ohm Rheostat; Teleradio 30-Ohm Rheostat; Teleradio Lightning Arrester; B-Metal Crystal Tube Detector Type A; B-Metal Adjustable Detector Type D; Aerovox Rheostat; Se-ArDe Vacuum Tube Socket; Basco Crystal Detector Assembly; Basco Rheostat. 3-ohm or 6-ohm. Class C Articles For six consecutively numbered coupons and ninety cents ($0.90) any one of the following articles will be Bent: 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 Amperlte Automatic Filament Control (with mounting); 1 Martin-Copeland Marco Rheostat; 1 Martin-Copeland Series Parallel Switch; 1 Martin-Copeland DPDT Panel Snitch: 1 Martin-Copeland 7-Point Inductance Switch; -1 Martin-Copeland 9-Point Inductance Switch; 1 Martin-Copeland 11-Point Inductance Switch; Walnart Variable Grid Leak with .00025 mfd. Condenser: Walnart Variable Condenser (3-plate .00006 mfd.); Ray-O-Vac Dry Battery, 2 cells 1% volts; Dubilier Ducon; Dubilier Micadon Type 600 (.006 mfd.) ; Dubilier Micadon Type 610 (.01 or .02 mfd.); Dubilier By -Pass Condenser (1 mfd.). Premier Universal Radio Jack. Filament Control Five Spring; CRL Variable Grid Leak, without condenser: Premier No. 250 Variable Resistance, panel mounting: Thordarson Vernier Rheostat; Ritter Loop Aerial; Martin Copeland Variable Grid Leak; Amsco Multiple Point Inductance Switch; Amsco 20-Ohm Rheostat; Amsco 50-Ohm Rheostat; Freshman Antenella; Freshman Micon Condenser, .01 mfd. ; Teleradio Variable Condensers. (3-plate or 11plate) ; Set "Read "EM" Binding Posts (9) ; B-Metal Crystal Tube Detector Type B; Illinois Cushion Resilient Socket; Aerovox Antenna Plug; Aerovox Potentiometer; Aerovox Crystal Detector ; Se-Ar-De Adjustable Vernier Condenser; Basco Tuning Coil; Basco Vernier Rheostat. Class D Articles For eight consecutive coupons and one dollar and twenty cents ($1.20) any one of the following articles will be sent: 1 Carter 20-Ohm Vernier Control Rheostat; 1 Schindler Radio Frequency Transformer; 1 MartinCopeland 13-Point Inductance Switch; 1 Martin-Copeland 15-Point Inductance Switch; 1 Martin-Copeland 19Toint Inductance Stfitcth: Walnart Variable Condenser (5-Plate .0001 mfd.); Ray-O-Vae No. 4151 B Battery, 22% volts; Ray-O-Vac Dry Battery, 3 cells i% volts; Electrad Variohm, with mica condenser; Dubilier ByPass Condenser (2 mfd.); CRL Variable Grid Leak wifh Condenser; Resistometer (Type A or 2A) ; Thordarson Variable Condenser, .00025 mfd. ; Amsco 300-Ohm Potentiometer: Freshman Micon Condenser, .015 mfd.; Teleradio Variable Condenser, 23-plate; Aerovox Crystal Detector and Condenser, mounted; Se-Ar-De Variable Grid Leak, with condenser mounting; Fil-Ko-Stat; R. S. C. Vernier Condenser, 3-plate; Basco Mahogany CabinetClass E Articles For ten consecutively numbered coupons and one dollar and fifty cents ($1.50) any one of the following articles will be sent: 1 Carter 6-Ohm Automatic Control Rheostat; 1 Carter 20 Ohm Automatic Control Rheostat; 1 Demcal 3-Plate Variable Condenser: Walnart Variable Condenser (13-Plate .00025 mfd.); Ray-O-Vac Dry Battery. 4 cells 1% volts; Dubilier Variodon (.0004 or .0006 mfd.): Resistometer (Type B) ; Delta Midget Tube and Socket; Thordarson Variable C denser, .0005 mfd. ; Freshman Micon Condenser, .02 mfd. ; B-Metal Crystal Tube Detector Type C; Aerovox 3-Gang Socket; Aerovox Double Slide Tuning Coil; Na-Ald 3-Plate Vernier Condenser, with dial. Class F Articles For twelve consecutively numbered coupons and one dollar and eighty cents $(1.80) the following will be sent: 1 Acme Pot-Rheo (potentiometer and rh»«tat) : Walnart Variable Condenser (23-Plate .0005 mfd.); Ray-O-Vac No. 2151 B Battery, 22% volts; Dubilier By-Pass Condenser (3 mfd): Premier Variable Condenser without dial (.00039 mfd.); Thordarson Variable Condenser, .001 mfd. ; Amsco Compensating Grid Condenser; Freshman Micon Condenser, 0.25 mfd.; Teleradio Variable Condenser, 43-plate; Se-Ar-De 3-Plate Condenser. Class G Articles For lourteen 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-Plate Variable Condenser; 1 Federal 21-Plate Variable Condenser; 1 Federal Anticapacity Switch; 1 Demcal Variable Condenser 11-Plate Walnart Variable Condenser (43-Plate .001 mfd.); Dubilier Variadon (.001 mfd.): Dubilier By-Pass Condenser (4 mfd.) ; Premier Variable Condenser with dial (.00078 mfd.): Premier Hegehog A. F. Transformer. 4 to 1 Ratio; Thordason A F. Transformer, 3.5 to 1 Ratio; Thordason Variable Condenser, with vernier, knob and dial (.0005 mfd.) ; Thordason Variable Condenser, with, vernier, knob and dial (.00025 mfd.); Ritter Grand Crystal Sef Amsco Double H/ C. Coil Mounting; Na-Ald 13-Plate Precision Condenser, with dial (.000297 mfd.) ; Na-Ald 23-Plate Precision Condenser, with dial (.000523 mfd.); Se-Ar-De 9-Plate Condenser: Se-Ar-De 17-Plate Condenser; R. S. C. Variable Condenser, 23-plate. Class B Articles For sixteen consecutively numbered coupons and three dollars ($3.00) any one of the following articles will be sent: 1 Federal Audio Freauency Transformer No 228 W; 1 Demcal 23-Plate Variable Condenser; 1 Acme Audio Frequency Transformer; 1 Acme Radio Frequency Transformer (R-2, R-3. or R-4) : Walnart Variable Condenser (13-Plate vernier; Walnart Variable Condenser (23-Plate vernier) ; Ray-O-Vac No. 2301 "B" Battery 45 volts: Bay-O-Vac Dry Battery. 6 cells 1% volts Dubilier Duratran (R. F. transformer) ; Premier Micrometer Variocoupler with dial; Premier Variable Condenser with dial (.0015 mfd.) ; Premier Variable Condenser with vernier (.0004 mfd.); Premier Hegehog A. F. Transformer. 10 to 1 Ratio; Premier Hegehog A. F. Transformer, Tube Socket Type. 4 to 1 Ratio: Turney Spider Web Coil Mount, Type B; Thordarson A. F. Transformer, 6 to 1 Ratio; Thordarson Variable Condenser, with vernier, knob and dial (.001 mfd.) ; T. B. H. Radio Heat Set, 2,000 ohms; Tulip Loud Speaker, 15-inch, white: Teleradio Vernier Condenser, 23-plate: Teleradio 2,000-Ohm Head Set; Na-Ald Tuned R. F. Transformer, one stage; Na-Ald 43-Plate Precision Condenser, with dial (.001 mfd.); Se-Ar-De 35-Plate Condenser; R. S. C. Variable Condenser, 43plate: Basco Radio Frequency Transformer. Hears WBAP Farthest BELLEFONTAINE, O. — Mrs. E. K. Deck of this city received the prize offered by the Young Men's Business League of Ballinger, Texas, for the listener at the greatest distance from Fort Worth who heard the program over WBAP by Ballinger talent given some weeks ago. The prize was a fine pair of head phones. CONTENTS Radio Digest, Illustrated, Volume VI, Number 6, published Chicago, Illinois, August 18, 1923. Published weekly by Radio Digest Publishing Company. 123 West Madison Street, Chicago. Illinois. Subscription rates, yearly. Five Dollars; Foreign, Six Dollars: single copies. Ten Cents. Entered as second-class matter at the postofflce at Chicago, Illinois, under the Act of March 3, 1879. "All the Live News of Radio" 1 to 9 Flewelling Answers to; Queries 4 How KSD Broadcasts from Stage; An Evening at Home with the Listener In 5 Simple Two Tube Hook-Up, R.D.-9Z 6 The Week's Advance Broadcast Programs , 7 Radiophone Broadcasting Station Directory — Part 1 8 Editorials; Indi-Gest; Condensed by Dielectric 10 First Steps for Beginners in Radio, Chapter XIII — Multi-Tube Reflex Circuit Operation, by Thomas W. Benson 11 How to Make Vernier Variable Condenser from Hard Rubber Dial; Five Other Kinks 12 Difficult Tube Characteristics Explained, Part III — Test Circuits, by H. J. Marx 13 Picture Diagram — How to Alter Crystal Detector Set for Use of Tube; Reviews of Books 14 Questions and Answers ' 15 Radio Illustrated, a Page of Pictures 16 Looking Ahead That New Neutrodyne Set — In the next issue there will appear the first part of the neutrodyne series telling about the latest advent in receiving sets. The articles will be written by H. J. Marx, who has made up this set and knows exactly the parts needed and how to assemble them for the best results. Follow these articles and you can make up a Radio frequency set that will bring in long distance during the hot weather. Headsets and Loud Speakers — Several months ago we published an article by Thomas W. Benson on how to make a loud speaker. There was a great response to this article. Mr. Benson will go into detail again on loud speakers and will give valuable information about the construction and use of them, as well as of headsets. Some Ideas for the Amateur Workman — In this article there will be told by Car] Masson various ways of doing things for the benefit of the person who cares to do his own work. How to make parts from broken apparatus, and an all-vernier condenser. Real Two-Coil Loop Aerial Circuit — The Simplex Diagrams have proven a great success. In the next issue there will be another circuit under the above title. It is a circuit similar to the Flewelling. Make one up. It's worth while. Single Tube Reflex Circuit — This hook-up will appear in the next issue. It is planned to be used with a good outside aerial and ground. Two honeycomb coils are used in the set. 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 find enclosed check M. 0. for Five Dollars (Six, Foreign) for One Year's Subscription tt Radio Digest, Illustrated. Name Address City State PLAN RADIO RUM HUNT (Continued from page 1) and above all to effect the capture of violators of the law. Plan Use of Naval Stations All of the intricate mechanism of the department of prohibition enforcement, all of its expert trackers, all of Its enormous financial resources having failed to blot bootlegging-, the treasury department is likely soon, it was intimated, to take steps to use at first the Radio stations of the navy department for the transmission of messages in code by enforcement directors in each state to their subordinates or by the latter to their superiors. Although the story was denied by prohibition officers here it was given substantiality and credibility by the attitude of others elsewhere. Close questioning of reluctant or reticent members of the prohibition enforcement-department revealed the fact that the applicability of Radio had been seriously considered. This was said to have been the line of reasoning: If, as an instance, a gang of bootleggers in Ohio or Illinois were to evade state and local authorities in an attempt to run a batch of goods from Cincinnati to Cleveland or from Peoria to Chicago or, as another illustration, across the Canadian border from "Windsor, Canada, to Detroit, the usual detecting or arresting devices would be employed — the telephone or the telegraph. But these have been of little avail. Often the bootleggers are given information in advance as to the plans of the officers. Frequently runners are enabled to hide their illegal burdens until the danger of capture is past. And repeatedly they have eluded their pursuers by means of high-powered cars or perhaps a more intimate knowledge of the country. Would Use Secret Code "If we decide to use Radio," said a widely known prohibition enforcement officer, "we would establish a secret code. Thus the director of a state could apprise his subordinates or would himself be informed of bootlegging expeditions or caches. None but a few of those of his department would know his plans. If they were revealed prematurely he would be enabled to find the spy. The director of one state could apply Radio to aid the director of an adjoining or even of a distant state. The governments of Canada and the United States, perhaps of Mexico, could by means of Radio do much to bar the smuggling of 'booze.' It seems to me that the application of a secret, perhaps an international, Radio code would do much toward the eradication of bootlegging and the enforcement of prohibition laws." Trailing Bum Convoys In most states of this country the directors of prohibition enforcement are assisted by three or more others who usually are established at strategic points, that is, where whisky and the like have been or are made or handled in greatest quantities. If the director in Cincinnati (following the suggestions of the department as to the use of Radio) learns that a liquor convoy is on the way to Cleveland secret word would immediately be sent either by telegraph or telephone to the nearest naval broadcasting station. The director in Cleveland, whose force would keep at all times in contact with the Radio receiver, would be informed by the naval Radio station that the bootleggers were en route to the lake port. Officers from both cities would immediately take the trail and the authorities of all nearby cities and towns would be advised as to the Chase. If motor cars were used by the officers each automobile would be equipped with a Radio receiving set so as to enable the pursuers to keep constantly in close touch with the developments of the hunt. Bootlegging on a large scale would thus be reduced, according to those who have considered the various phases of the application of Radio. LILA LEE ON WDAP (Continued from page 1) more friendly to be able to speak directly to you. "Here I am in Chicago, my birthplace, on the way from New York City to Hollywood to make the new picture — 'All Must Marry' — written by George Ade, in which Thomas Meighan and I are to play the principal roles. "Yes — all must marry" — a merry twinkle in the actress' eyes and a coy smile showed that she believed it. (She was wed a few days later to James Kirkwood, her director.) "And it is well. To my young girl and boy friends especially do I send these words — your work and your play must be clean. Your thoughts must be clean. These lead to and further happy marriages." Defends Screen Notables Then Miss Lee broadcast a defense of screen notables, who, she said, were no more vicious than the men and women of other walks of life. "Do not believe the stories about the orgies of Hollywood," she pleaded. "They are not true. Of course there are some among us who have been indiscreet, but as a whole we are just folks, eager for your good will." That Miss Lee's talk was well received was shown by the many letters addressed to her from all parts of the country in care of Station WDAP. A telegram from Upper Michigan, forwarded to Hollywood, said: "Miss Lee can talk as well as she can act," i ■