Evening Star Newspaper, December 15, 1925, Page 59

FANS T0 ENGAGE IN DX CONTEST Program Offers Chance for Amateurs to Try Out Over- seas Stations. An Amerfcan DX contest which will be participated In by broadcasting stations in every State in the Union, as well as by Canadian and Mexican stations, will be one of the features of International Radio week, January 24 to 30, according to announcement by officials of the committee who have charge of the movement ts of the week will international radio hroadcasting tests, American stations transmitting specfal programs to over- | ring the hours from 9 to 10, cen tandard time; while American listeners will hear special Programs from_overseas st the hours from 10 to 11, «rd time, when American, and Mexican stations remain si How Program Is Arranged. | January 29, at the cus- | ation in the | plan of broadeasting will be made and roadcasters in | try will | seas listeners d ay 1ute peric ¢ thousands of ¥ uary 30. another n of the DX contest will be ar slusion of om all Amer of over t hour, Sixte » silent hour th State half of up the asters in e United broadeastir The Sine Wave in Alternating Cur\em theory and practice expresses the re latfonship which exists between time alternating current circuit a_particular tme or part of the cycle | vill be dev half of the United of the r 1o en entire | for tk s in their own commn 1 Saturday have pledg edge all reports tion from dista no doubt that Reproduction Isolantite (=ynthe found o be the FIFTEEN MINUTES OF RADIO EACH DAY BY JOSEPH CALCATERRA, Noted Authority on Radio. Reproduction Prohibited. All Rights Reserved. Theory and Practice. Part The sine wave in alternating current nd current and voltage values in an Any point on the sine wave gives the instan- taneous value of current or voltage at | of the current in the circuit. | The method used to plot these values will be better understood if you know just how alternating current is pro- duced in the usual alternating current generator. Current Flow in Conductor. Most fans already know that when a conductor is made to cut lines of magnetic flux, a current will flow in the conductor if the conductor is ¢on- nected in a_ complete electrical cir- cuit. The diagram in Figure 1 illus trates the fundamental or basic prin- ciple of an alternating current gen erator or dynamo. It consists of a powerful magnet with opposite poles of the magnet placed opposite each other so as to produce a powerful magnetic field with lines of flux pass. ing between the north and south poles. A loop of wire with terminals “BC” made to rotate i the magnetic ound an axis The mag- lines are represented as going 1 the north pole to the south pole { the magnet. If the Joop is rotated in a counter clockwise direction the current will flow in the wire in the direction indi cated by the arrow on the loop, that is from “C” to “B” in the loop. “L" is @ lamp or other device connected | in the external circuit is a eross-section owing the flow res from north to e direction of rotation nd the direction of cur-| the loop of wire in the! You will notice that | Acoustics by Brandes means better radio. The new ers are truly remarkable—the result of seventeen years of intensive re- search in the Brandes laboratories. Distributor National Electric Supply Co. 1330 N. Y. Ave. Main 6800 You Have a Loud Speaker Now one of the small circles which repre- sent {s shown with a_dot In the center of the wire while the one at the TIEht 15 | i o A et (he o shown with a little cross. the conventional ways of showing cur- rent flow in a cross-section of a wire. The dot indicates o flow of current | iros SR % toward you, while the cross indicates | e s “rorgion 7 pOvES throukh a flow away from you. : the idea of an urrow coming toward | o you and showing a polnt and that of | s i more n arrow golng away from you and | oF isc% connec I Wosnds Sajs sowRWOlARE taLy of the wire and insulated from each of the arrow. Take a DICTOGRAND home. .. hook it up, tune in on one station ... thenalternate between your two speakers . . . If the DICTOGRAND in your judgment doesn’t give better tone repro- duction . . . bring it back and your money will be refunded. That's a fair, square, sporting proposition. Trya DICTOGRAND At good DEALERS THREE MODELS - PORTABLE + UPRIGHT - CONSOLE DICTOGRAPH PRODUCTS CORPORATION 220 West 42nd Street, New York, N. Y. + STAR, WASHI SANTA NEGLECTING RADIO PROGRAMS Many Stations to Be Silent en! Christmas Day Announce- ments Reveal. ‘} The radio Santa Claus of 1925, ac-| cording to present indications, 1s going to be only a half-hearted fellow. He is loading his sleigh with a record number of receiving sets, but he has made very few arrangements with broadcasting stations to put snappy | Christmas programs on the air. | Advance programs recelved from | more than a score of leading stations throughout the country in nearly every case hear after the date “De- | cember 25 the word “silent.’ { Similar notations were made posite Christmas last year and Santa | Claus' radio gifss were about as usgelul | for 24 hours @ mechinical tays “with- | out keys.' . 1 | From one of. the Washington sta | tions, it s learned Ahit- there: hnve Ibeen sevéral. legfers .1é from prospective radio donos that @ local program be broadeast at 6 a.m | op i |are interchanged in position and now the flow of current is from the "¢ terminal toward the "F a rever: the cross-section of the wire 1t in the loop, | These are | gy shown in Figures 1A and 2A. | In Figure 1A you will not the leads to the external circuit that | are revolution. In commercial dynamos this Is taken care of a t of brush conta with t This follow: connec wo 1 feathers | giper. The comme dynamos @ contain a large numl of turr in half a|place of the single turn shown in the 1 As the loop goes through revolution, the two arms of the loop 'diagram. Z THE on Christmas d; received sets may be tried out that if a nation-w could be effected fi |it proba | audienc veaso UESDAY, DECEMBER 1 . so that the newly The suggestion also has been offered - Christmas day, bly would draw the greatest | given a single broadcast. 1, the broadcasters ave given as the | “hristmas sllence the |eve, by the- Ru Uesire to have thelr employes observe (o o g the holiday in the(r own homes, avith- | i grong t out being obliged to Wwork: Station to Hx;vu Low Wave Length. } A wave length for the “Voice of St. |, " the new Station which is ex- | to be completed hy Ju 1, ¢ will be included in those of statfons operating under temporary uthority of the Department of Com- | s learned today The | ¢ {gned, however, will ‘Will Be Broadcast by WGBS. Russian Yuletide songs will in m: broadeast from WGBS, sky, tenor; I 0. Russia: Russian folk and “hris has appeared ex and Amerfea and rtet oth Europe | elicited wide p n S : be one. 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Alawt 18 months age s logg's AL sny truthfully that it is the only thing that ever guve me relicl Yours truly L. T. WiLuiaus 1308 Broadway, Indianapolis, Ind. ALL-BRAN LAt a i Ll Pl a b dr gtV IR g P Y g F r T ] ! OPEN EVENINGS TILL XMAS A GG G (2 (0 25 O G L 4 r ol €2 RUSSIAN QUARTET TO SING tie-up of stations { Unique 'Christmas Eve Program be Christmas | an Cathedral Quar- at was sent to this country by the Muscovite government | to further appreciation of their rausic. In the quartet are Nicholas “Wasilev- B. Parloff, second tenor; ff, baritone, and Michael ections sung by the quartet | will be the same that are heard at this time of the year in the churches of religious This tensively in has e from its audiences, tee arranging the to be Leld the JOINS MOVEMENT. i Peruvian Station to Co-Operate in @ry International Rado Week Plans. | 540 h 380 mete Station OAX of Lima, is one of the latest foreign broadcasting stu- |t tlons to announce its co-operation with | 511 e s and will at r o the fi fonal Pert - QYondenfi delicious flavor, “De Luxe Packaged Ice. Cream. , o "OLD ONLY. IN QUART PACKA NEWEST---THE BEST---THE MOST REASONABLY PRICED O MONEY DOWN MOSKIN SAYS---You Don’t Need Cash for Your Xmas Clothes--- Come Here Tomorrow and Pay No Money Down On Any Purchase Up to $25---Save Your Ready Cash for Other Xmas Needs--- PIll Gladly Wait---Welcome Every Moskin Says---I've Got 1,000 Men’s and Young Men’s Suits & ~ O’Coats To Sell at $5 to $10 Less for Xmas I'm mighty proud of these clothes because I made a special trip to New York to select them personally. y're all wool, high quality garments, made to sell for nfi.mt deal more. My special price .. Gifts Men Will Appreciate Most New Hats ..$3.50 Sweaters . ..$5.95 Silk Shirts .$4.50 Slickers .. .$6.95 Clothes for Boys body---Moskin Trusts You Moskin Says--- 217 Women Can Own High Quality Fuar-Trimmed COATS AT THIS LOW PRICE Pll giadden the hearts of s 2 9 98 L} every woman who selects one SALE OF SILK DRESSES SEAEI2Y New Millinery. ......$3.98 Special Sale, of Coats for Girls, $12.95 of these coats. They're as pretty as I'Ve carried this season, and the best values in town. My special price... Beauties—every one of them. They call ’em ai- vance Spring Models. I GCES mmmmmmmmmms:ammmmz:aammazammmmmm'mmm:mammnmmmm&mz&mm&mzmmfi | Arthur Lynch, chalrman of the ~om=s jBternggiv woek of § tempt 1o use ex i)