Radio mirror (Jan-Oct 1923)

RADIO DIGEST May 19, 1923 RADIO FINDS RARE ORES (Continued from page 1) swung around facing the shaft, the maximum of vibration was observed. At this point the telephone receivers gave forth a thunderous roar, but on the opposite side there practically was no sound. Before going to the Verdi Central, the experimenters took their apparatus to the United Verde mine, where a large deposit of sulphide copper ore was exposed. They founa on setting up the instrument some distance from the deposit that the maximum vibration was directly in line with the ore body. Following this they experimented in other locations at some distance from the ore body, and the result was always the same. Milling Official Gives Okeh In an interview, George A. Newett, director of Calumet and Arizona mining concerns, said: "Undoubtedly there is merit in the device and it is my opinion it will be of inestimable value in the location of sulphide ores in any part of the world where they are suspected to be found." Local mining officials are very enthusiastic over the new device. Following the experiments and tests to prove the practicability of certain changes and adaptions in the hook-up the apparatus will be put in actual field work. MOVIE STAR BROADCAST (Continued from page 1) screen. And yet of all the countless thousands who appeared at the stations this was only a small part of the vast audience who heard Miss Roland by Radio. During the time the train's broadcasting plant was not in operation the receiving set was tuned in in the observation car and entertainment was furnished the passengers from many of the large stations en route. Radiophans from all parts of the United States heard Miss Roland's broadcast with unusual clarity and the exploitation of transmission from train hoard was considered a huge success. Train Equipment Practical The outstanding fact gained from the tests is that with specially designed receiving equipment on a train, it is quite possible to communicate from any part of the United States with the train while it is in motion, no matter what its speed. The specific lessons taught by the experiments are: That tunnels and cuts will not affect this communication so seriously as was at first thought. Lakes and other large bodies of water near the railroad tracks have the peculiar property of increasing the signal strength. Mountains rising directly above the railroad tracks completely wipe out the signals when the mountain stands between the fixed Radio station and the train. Flat Top Aerial Directional The tests in other directions confirm many theories, particularly that of the directional effect of the flat top aerial. This was very pronounced when the train was rounding a curve. The position of the antenna in regard to the station, from which signals were received was another important factor, for often going around a curve on a perfectly level plain would make one station fade out and bring in another. A right angle crossing under high tension and 500-volt trolley wires completely cut out reception for a fraction of a second. The antenna on the train consisted of one No. 16 copper strand stretched the full length of the car 18 inches above the center line of the roof, also a loop aerial inside of the car. WNAC HARD TO HEAR ON 286 WAVE LENGTH Roger Babson's New Plant to Be on 337 Meters BOSTON, MASS. — Varying reports are coming in from Radiophans regarding reception of WNAC on the new wave length of 286 meters. Those living nearby report they notice little if any change, but others report reception much weaker, while still others report that they cannot get the station at all. Since WNAC is rated as a 100-watt station, under the new grouping, it is excluded from the 360meter wave length, in spite of the highclass programs it is broadcasting, and has been sending ever since it was built — programs the equal of any in the East, and superior to many programs given elsewhere. Until the WNAC engineers have solved the problems confronting them, Radiophans will have to be patient, but they may rest assured that everything will be done that can be done to make the station heard by as many and as far away as possible. As the former wave length was extremely broad, fans found it easier to tune in, and now they will have to be more critical in their tuning. Perhaps if they are careful and work finer in their tuning, they may get better results with WNAC. Roger Babson's new station at Wellesley Hills, being of 500-watt power or more, will be allocated a wave length of 337 meters. AN EVENING AT HOME WITH THE LISTENER IN (SEE NOTE BELOW FOR INSTRUCTIONS) Station and City CFCA, Toronto, Ont CFCN, Calgary, Alta. CKAC, Montreal. Que. KDKA, E. Pittsburgh, Pa . KFAF, Denver, Colo KFDB, San Francisco. Calif. KFI. Los Angeles, Calif. . . . KG W, Portland, Ore KHJ, Los Angeles, Calif. . . . KPO, San Francisco, Calif. . KSD, St. Louis, Mo KYW, Chicago. Ill NAA, Eadio. Va PWX, Havana, Cuba WBAP, Fort Worth. Texas. WBZ, Springfield, Mass.... WCX, Detroit. Mich WDAF, Kansas Citv, Mo.. . WDAJ, College Park, Ga. . . WDAP, Chicago. Ill WEAF, New York, N. Y. . . WFAA, Dallas. Tex. WFL Philadelphia. Pa WGL Medford, Mass WGM, Atlanta, Ga WGR, Buffalo. N. Y WGY, Schenectady, N.Y.. WHA, Madison, Wis WHAS, Louisville. Ky.. .. WHAZ,Trov,N. Y WHB, Kansas City, Mo.... WHK, Cleveland, 0 WIP, Philadelphia, Pa WJAX, Cleveland, 0 WJZ, New York, N.Y.... WKAQ, San Juan, P. R.... WLAG, Minneapolis, Minn. WLW, Cincinnati, 0 WMAQ, Chicago, 111 WMC, Memphis, Tenn WOaI, San Antonio, Texas. WOC, Davenport, la WOO, Philadelphia, Pa.... W OR, Newark, N. J WSB, Atlanta, Ga WSY, Birmingham, Ala WW J, Detroit, Mich Met. Monday Tuesday Wednesday Thursday Friday Saturday Sunday 400 440 430 360 360 509 469 455 395 423 546 448 435 400 476 337 517 411 360 390 492 476 395 360 429 360 380 360 400 380 411 390 509 390 455 360 417 360 448 500 400 484 509 405 429 360 517 7:00 8:00 5:00 9:00 9:00-10:00 10:00-12:00 7:00 1:00 10:00 2:00 S:45-ll:30 8:00-12:30 8:00 9:30 5:45 7:30 7:15-10:30 6:30 8:00 7:00-10:00 6:00 1:00 7:30-11:30 6:30-' 9:66 8:30 9:30 5:30 6:00 9:30-10:30 7:00 9:00 6:45 9:00 7:00 9:00 7:15 8:30 5:00 5:30 6:00 6:30 7:30 9:30 10:10-11:30 7:00 9:00 8:00 9:30 7:00 8:30 6:50-11:00 5:15 6:30 10:45-12:00 8:00 8:45 7:00-S:00 6:00-10:30 5:00 9:00 9:00-10:00 7:00 1:00 8:45-11:30 10:00-12:00 8:00-10:00 8:00 9:30 6:05. 7:20 7:00 8:00 11:30-12:30 5:00 9:00 10:00-12:00 7:00 1:00 10:00-11:00 8:45-11:30 7:15-10:30 6:30 8:00 7:00-10:00 6:00 1:00 7:30-11:30 10:00 2:00 6:30 7:00 8:30-12:00 5:30 6:00 7:30 9:00 9:30-10:30 6:45 9:00 7:00 8:00 7:30 9:00 8:00-10:00 5:00 5:30 6:00-11:00 6:00 7:30 6:00 9:30 6:00 7:30 9:00-11:00 7:00-10:00 8:00 9:30 9:30-10:30 7:00-10:00 10:45-12:00 6:00 9:00 8:0010:00 8:00 9:30 6:25 8:40 S:00-10:30 7:15-10:30 6:30 8:00 7:00-10:00 6:00 1:00 10:30-11:30 6:30 9:00 8:30 9:30 7:00 9:30 5:45 7:30 9:30-10:30 7:00 9:00 7:00-' 8:66 7:30 9:00 7:00 8:45 6:00 6:30 8:00 9:30 6:00 7:30 7:00 9:00 7:00-10:00 10:00-11:00 7:00 8:00 6:00-10:30 5:00 9:00 9:00-10:00 7:00 1:00 8:45-11:30 10:00-12:00 8:00 9:30 5:45 7:40 7:15-10:30 6:30 8:00 7:00-10:00 6:00 1:00 7:30-11:30 10:00 2:00 6:30 9:00 8:30-12:00 5:30 6:00 8:30-10:00 9:30-10:30 6:45 9:00 7:00 9:00 7:30 9:00 5:15 6:30 5 10:45-12:0040 8:00 8:45i 6:00 9:00i 6:00 9:00 :00-10:00 00 5:30 00 6:30 15 9:30 30 9:30 30 9:30 15-10:30 00-11:00 00-10:00 00 9:30 30 8:30 ;00 8:30 50 9:10 15 6:30 :45-12:00 7:00 8:00 5:00 9:00 9:00-10:00 10:00-12:00 7:00 1:00 9:00 2:00 8:45-11:30 8:00-11:30 11:30 1:00 7:00 8:40 7:15-10:30 6:30 8:00 7*0-10:00 6:00 1:00 7:30-11:30 6:30 7:00 8:30 9:30 7:30 9:30 8:30-10:00 9:30-i0:30 7:00 9:00 6:45-11:00 7:00 8:00 7:30 9:00 5:00 5:30 6:00 8:55 7:30 9:30 6:00-' 7:30 7:00-10:00 8:00 9:30 7:00 8:30 7:00-10:00 10:45-12:00 8:00 8:45 6:00 9:00 7:00 8:00 11:30-12:30 6:00-10:30 5:00 9:00 9:00-10:00 7:00 1:00 8:45-11:30 10:00-12:00 8:00-10:00 8:00 9:30 8:00 10:30 6:30-' 8:66 6:00 1:00 7:30-11:30 10:00 2:00 6:30 9:00 8:30-12:00 8:00-11:00 7:30 9:00 9:30-10:30 7:00 8:00 7:30 9:00 5:00 5:30 9:10-11:00 7:30-10:00 7:30 9:30 8:30-10:30 7:00-10:00 8:00-9:30 9:30-10:30 5:15 6:30 10:45-12:00 6:45 7:45 3:00 5:00 1:45 3:45 9:00 9:30 10:00 IKK) 9:00-10:00 12*0 1:00 7:00 8:00 6:30 6:45 7:00 8:00 4:00 5:00 11:45 1:00 7:30-11:30 9:00-12:00 9:304036 8:30-10:66 7:30 8:00 6:30 7:30 8:00-10:00 7:00 8:45 7:30 9:00 9:30-10:30 7:00 9:00 7:30 9:00 7:30 8:30 6:30 7:30 Instructions for Use. — All the hours above are given in Central Standard Time. If your city uses Eastern Time, add one hour to each of the periods stated; if your city uses Mountain Time, subtract one hour; if your city uses Pacific Time, subtract two hours. If in addition your city is using Daylight Saving Time, add one hour to this result. CONTENTS Badio Digest, Illustrated, Volume V. Number 6. published Chicago, Illinois, May 19, 1923. Published weekly by Badio Digest .Publishing Company. 123 West Madison Street. Chicago, Illinois. Subscription rates, yearly. Five Dollars; Foreign, Six Dollars; single copies. Ten CVnts. 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 5 An Evening at Home with the Listener In 2 Radio Replaces the Mandolin 3 Hawaiians in U. S. Heard at Home.... 5 The Week's Advance Broadcast Programs 6 How to Make One Condenser Flivver Super Set, Part III — Circuit Diagram and List of Parts, By E. T. Flewelling 7 Directory of Broadcasting Stations 8 Book Reviews , 9 Editorials; Indigest; Condensed by Dielectric 10 First Steps for Beginners in Radio, Chapter III — Part I; Pointers About Aerials and Grounds, By Thomas W. Benson 11 "How to Make a Two Electrode Tube" and Other Kinks „ 12 Making a Three Tube Reflex De Luxe Receiver, Part III— Details of Wiring, By H. J. Marx. . . 13 Questions and Answers 15 Radio Illustrated, a Page of Pictures 16 Looking Ahead Loud Speaker Builders — Next issue Thomas W. Benson will elaborate on kis recent article telling how to make a moving coil loud speaker. He has had many queries as a result of the first article and has "boiled" these down into a round table discussion. Then, Too, His Beginners' Series Chapter — next week — will explore the realm of loop antennae. H. J. Marx Winds up His Three-Tube Reflex Series Next Issue — telling how to put the set in a cabinet and the tricks of operation. In another part of the same issue he will give some "dope" on a very good Four-Circuit Tuner something new. E. T. Flewelling Believes — and He Ought to Know — that panel layout is very important in the functioning of his circuit. In Part IV, next week, he will tell how to arrange the panel for the One Condenser Super Set. More Reasons for Buying Next Issue — Advance programs for the big stations; new •wave lengths for stations as they change; an interview with C. Francis Jenkins, inventor of Radio motion pictures. Looking Ahead into the Summer — a Portable Set Number. The latest Radio vacation aids will be described. Radio is a GO this summer. Plenty of big stations are on plenty of different waves. Fish for broadcasts with your trout. Newsstands Don't Always Have One Left 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 to Radio Digest Illustrated. Name Address City State STOLEN BOY FOUND BY BROADCAST AID SON OF RADIO ENGINEER • RETURNED HOME Sheriff of Watertown, N. Y., Hears Broadcast Description and Discovers Child in Lonely Hut SCHENECTADY, X. T.— Little Vernon Alexanderson, age 5, was recently returned safely to his home here after being kept in a lonely hut by kidnapers for nearly a week. The child was rescued by the direct results of Radio broadcast. Vernon, the son of E. F. Alexanderson, chief engineer for the Radio Corporation of America, was lured away from his home by a man who promised him some rabbits. The man sent Vernon's little sister for a box to keep the rabbits in and when the girl was out of sight the boy was thrown into a waiting auto which sped away. Upon learning of his child's disappearance, Mr. Alexanderson brought into play one of the most powerful forces of news spreading known to man — Radio. Complete description of the lost child and full information of his disappearance was broadcast from all the larger plants in the eastern and central states. Find Iiad in Watertown The lad was later found in a hut near Watertown, N. T., in the care of Mrs. M. L. Grennell, 66, who alleges she was paid to care for the child and knew nothing of the kidnapping. The sheriff of Watertown became suspicious of the new occupants of the house in which Vernon was found after hearing the broadcast sent out from a local station. He at once investigated and the result is Vernon is safe at home with his Mom and Dad. Complete descriptions of two men who are said to be implicated in the child stealing have been obtained from Mrs. Grennell and Vernon's sister and a net has been spread by the Radio broadcasting stations that is practically impossible to be escaped. The capture of the men is expected at an early date. K. C. Broadcast Fourth Degree BUFFALO, N. T. — For the first time in the history of the Knights of Columbus in Albany speeches that were delivered at a fourth degree dinner were broadcasted. Replace your old Coils with a B-T REINARTZ VERNIER TUNER Another Bremer-Tully "hit" which guarantees greater RANGE, SELECTIVITY and CONTROL than any coil ever made. Saves work — no taps, switches or switch points needed. Suitable for all NEW BROADCASTING WAVE LENGTHS. Designed for adaptation to practically all modern hook-ups. DO NOT START YOUR SET UNTIL YOU GET INFORMATION Special Condensers and Transformers for NEUTRODYNE CIRCUITS ready May 10. BREMER-TULLY MFG. CO. "Originators of the Vernier Idea" 532 South Canal St CHICAGO SHELTONE LOUD SPEAKER With Special Nath. Baldwin Type C Headset Correct in Principle Perfect Results When you sit back to enjoy the broadcast program, you want perfect reproduction. The SHELTONE will give you the program in all its original beauty. It is built differently to take advantage ofthe most correct acoustic principles and reproduce music and speech with correctness. Loud Speaker, complete. $16.00 Loud Speaker, no phones 4.00 Postpaid C. O. D. or Cash with Order Dealers Write for Discounts THE SHELTONE CO. 70 HALSEY STREET, NEWARK. N. ^Uf