Evening Star Newspaper, May 30, 1922, Page 22

BY A. HYATT VERRILL, Expert on Radio Technology. The very simple single-circult crystal set described in my last article may be vastly Improved by adding more or bet- ter devices, which allow the operator to tune or adjust the set more accurately, thus enabling the operator to cut out or eliminate undesirable messages or in- terferences. But you must not expect to increase the distance range of your set by so doiig. To be sure, With a better set you may be able to get the music more easily and clearly, and so you may think you can pick up the sig- nals farther from the sending station. But this is not so. It is really because You can tune better and can also adjust your set to capacity. In other words, you can pick up fainter or shorter waves through better tuning. No mat- ter what type of crystal set you use your limit of distance for receiving music will be limited, usually to about twenty-five miles in the country or small villages and less in cities. Spark signals or messages in dot and dash codes may be received from many times that distance. With the plain, tapped coil already de- scribed, the range of tuning or the range in wave lengths winich may be picked up is limited and can only be increased by using a longer aerial. If this is done then you will have difficulty in get- ting the short wave signals. The solu- tion of this problem lies in using a better coil with greater range of ad- Jjustments and a variable condenser. The latter will improve any set, for it mot only acts as a tuner, cutting down the wave length of the set, enabling you to 'EXPERT ADVICE ON RADIO| No. 14—Improving ‘the Crystal Set. wax will answer; some No. 16 or 18 plain copper wire, a multiple-point switch, or switch made as described in tha last article, and four or five switch arms. If you prefer to make everything yourself, get some strip spring brass about one-sixteenth of an inch thick. You will also need a few binding posts and odds and ends. Start the coil by running one end of the wire through a hole about one-half an inch from one end of the tube and wind the wire on even- ly and smoothly the entire length of the coll, leaving spaces of about one- thirty-second of an inch between wires. This is a dificult thing to do, unless you use a coll form which is designed for the purpose and is provided with grooves for the wires. But It is very easily accomplished by winding on a plece of twine with the wire, as shown in the cut. To Attach Coil. When the coll is complete the twine may be,removed if desired, but it may be left in place just as well and wiil then serve to keep the wirves from moving or slipping together, which would 1uin the coil. When the coll 1s wound it should be mounted be- tween two uprights fastened to a base or panel, as fllustrated. The easiest way to attach the coil to these uprights i3 to cut half circles from the supports and then attach the coil by small tacks or screws driven through the bare ends of the tube into the wood, as illustrated in_the diagram. Cut a strip of wood or fiber just long enough to fit between these uprights and about one-inch in width. Upon_this mount the four or five switch arms as illustrated, spacing them equidistant apart. In & straight HWomosng Wige Wirw Srwg AW Con. ComPLETFD (1Y) receive shorter waves, but, In addition, it increases or magnifies the strength of the waves. Therefore the weaker, high-frequency pulsations are altered to stronger pulsations of less frequency. Variable Condenser Inexpensive. It is not a good plan .to attempt to make a variable condenser, for they are not expensive if purchased ready-made, and a great deal of skill, experience and knowledge are required to build one with a definite capacity and which will be eficient. Aside from this, the set already de- scribed may remain the same as be- fore, but with the better coil added, or, rather, replacing the simple ta; ped coil. The easiest coil to make and which will give finer tuning than a tapped coil is either a slider coil or a coil with adjustable fingers or arms. Either of these will give very fine and unlimited variations in adjustment. Slider coils have been great favorites in the past, but they have several disadvantages, which are entirely done away with in the other type of coll, which is seldom seen and little known. In the first place, there is always trouble in making a slider which will stay put and which will make a good contact and connection after it has been used for a time. Then, too, quite a little metal work and soldering 18 necessary to make one properly, and to obtain good results two sliders must be used, which compli- cates matters. To make such cofl you will need a tube, preferably formica or some similar composition, although a pasteboard tube soaked in parafin waves of short or medium length, un- less you have a very long aerial. 1n that case you will not be able to tune down to the shorter waves used by the broadcasting stations and ama- teurs. Although these are the main object with most people, still, many persons like to hear the spark sig- nals and code messages from the big stations, which are sent on long waves. Tomorrow I will describe how you can add to the crystal set in such way that this may be accomplished. (Copyright, 1922.) Tomorrow—""To Increase Weave Lengths of Crystal Set.’ WIrE Connarrions (g line and to the switch arm posts con- nect short lengths of wire. Bore holes through the base to take these wires and fasten the strip bearing the arms to the supports of the coil so that the tips of the arms bear firmly upon the wires of the coll, Place the multiple-point switch and contacts on some convenlent part of the panel and connect the wires from the arms on the strip to the contact points of the switch. Finally, connect one end of the coil wire to & binding d run a wire from the mui- armpost to another bind- shown in the accompany- ing diagram. The coll is now ready to be connected with the set. This is done exactly with the tapped coil already described. The variable con- denser may be placed either in the lead-in or aerial circult or in the round wire. but many prefer the ormer arrangement. ‘Wide Range Possible. It you wish to make the contact arms for the coil you may do so by cutting strips of spring brass or cop- per in the shape shown in the cut ahd mounting them on the strip by means of brass bolts with washers between the strip and arms and be- tween the arms and the bolt head. 1t is a bad plan to touch one’s fingers to these points while adjusting them. Thus, insulated handles may be fitted by using small rubber stoppers (such as are used in bottles and may be secured at any drug store) to the arms by means of small brass bolt: as shown in the diagram. uch a set will have a wide range of tuni: but will be limited to POMP IN TCHITCHERIN VISIT TO D’ANNUNZIO gal Days at Fiume Recalled by Visit of Soviet Premier to Poet’s Villa. By the Associated Press. ROME, May 30.—The regal days of Gabriele d’Annunzio at Flume were recalled at the poet's villa on Lake Garda when he received George Tchitcherin, the bolshevik foreign minister. An escort of leglonaires preceded Tchitcherin from Rapallo to Gardone villa. Signor Coselschi, the poet's secretary, accompanied the Russian. On the lawn of the villa d'Annun- zlo's banner of the regency of Quar- nero, with fts bright red background and a golden circle encireling the po- lar_constellation in gold, was un- furled. A guard of honor of Arditi presented arms as Tchitcherin en- tered. He was received in great state by the poet, who invited him to lunch. Afterward d’Annunzio and Tchitcherin had a three-hour conversation. CAPT. TYNG ASSIGNED. Capt. Francls C. Tyng, Medical Corps, returning from abroad, has been ordered to this city for duty at the Army Medical School. in the city visited. Bowntown Office, 900-902 F St. N.W. Travelers’ Letters of Credit The Letter of Credit is the instrument most approved by experienced travelers for carrying funds. Notwithstanding the introduction of other excellent devices, it retains the preference. The Letter of Credit issued by us is convenient, safe and economical, and gives practically all the advantages of a personal bank account We Issue Them (a) Agfiinst a deposit account of the amount desired and pay interest thereon till drawn. - (b) ‘Against a deposit of approved collateral and collect the income for you while held.- i (c) Against payment at current rates of exchange. _ Over 3,000 banks throughout the world honor our Letters of Credit. The Washington Loan and Trust Comp ny ,. /JOHN B, LARNER, President. J ! *"The Juggler BY RADIO TODAY Complete Programs of Radio Broadcasting Stations. -4 SPECIAL. Lincoln Memorial Dedication Speechea—NAA, 2,650 meters;’ NOF, 412 meters; starting at 2:30 p.m. NAA—Naval Radlo Statiom, Radlo, Va. 10:30 a.m.—Meteorological report on 5,950 meters of arc transmitter. Noon and 10 p.m.—Time signal, fol- lowed by weafher report and ship or- ders. 10:30 p.m.—Naval press news, wave length, 2,650 meters. ‘WWX—Post Office Department. 10 am.—Weather report for the District of Columbla, Pennsylvania, Ohio, Maryland, Virginia and West T HAVE BEEN ASKED TO TALK TONIGHT /ON "How PAT FoLKs CAN ENJOY LAP LUNCHES WITHOUT LAPS"-~ & ~ s S (L5 (LT NS TT WORKS PFINE, DoNT i 57 - SEE, I'vE GOT MY NEW RADIO HID IN HERE" rt At Thy Sweet Baint-Saens ...0ld Irish Old Bweet Song"” . ...J. L. Molloy b. “Gooa Night, Swee! Dreams” .................Bischoft Zona Keaterson Berg. Bessle Latham Wilson at the plano. Violine—"Nocturne” ....Slunivko Virginia Heff- Mary Park Clement: ty, Addison Peletier, Josef Kaspar. thel Garrett at the plano. Puplls of the Hendley-Kaspar Music School. ne solos: Now Like a Lantern” Barito a .Kramer y Lewis Corning Atwater at the piano. Violin golo: Russian Alrs..De Beriot Master Isaac Minovich, 11-year-old ' pupll of Joget Kaspar. Miss Dora Minovich at the plano. Contralto solos: Suite 2. “My Heart Is Weary”.......Thomas (Aria from opera, “Nadeschda.” . Mildred DeHart. Albert W. Harned at the plano. Celio solos a. “Nina" . Pergolese b. “Serenade” .Schubert ¢. “Berceus .Godard Virginia. Borls Paskowitsz. : Amella Olmsted at the plano. 10:30 a.m—Marketgram (fruit and | contralto solos: Suite 3 vegetables) on 1,100 meters. 2 “Dawn~ 12:30, 2:15 and 3:30 pm.—C. W.| b. “A June Morning Marketgram telegrams on 1,980 | c. “By the Waters of Minne- meter. tonka” ......... Lieurance 5 p.m.—Wholesale dairy report on| d. “Smilin* Through .,-Penn 1,160 meters by radiophone. . “Roses Are the Rhymes I 7:30 and 8 p.m.—Market report on Wreath” ..... Ormond 1,160 meters by radiophone. Mildred DeHart. 9:50 p.m.—Weather report. Albert W. Harned at the plano. ‘WMU—Doubleday and Hill Eleectrie Company (360 Meters). 4:30 to 6:30 p.m.—Base ball scores 3YN—National Radio Institute (300 meters). 6:30 to 7 p.m.—Radlo spark code. ?‘rxa_noulr;ced “La g:renlll-, soprano ostl) ; & e nctuar: plano (Dvorsky): “Wana,” fox trot (Cliff- | WGY — Gemeral Electrie Company, Friend-Wright-De Rose): “Cantzones | Schemectady, N. Y. (360 meters— Arabescas,” contralto (8. Pedrell); s,” plano (Moszkows- ki): “Smilin’,” 'fox trot (Coburn- Rose Wolohan-Kraunsgrill); “Melo- die,” plano (Ganz); “Three O'Clock in the Morning” (Robledo); “Slavonic Dance,” violin (Dvorak): “Murmur- ing Zephyrs,” plano (Jensen); “All That I Need Is You" (Santley Baer); “La Boheme,” piano (Puccini); “Why Don’t You Smile,” fox trot (Schwartz); “Moon River,” waltz (David); “Spring Song,” piano (Mendelssohn). Base ball scores announced. WPM—Thomas J. Williams, Ine. (360 Meters. 12:30 p.m.—News {tems; reports on stolen automobiles. WJH—White & Boyer Co. (300 Meters). 7:45 p.m—Following Music week program under direction of Theodore Hoffmann: Recitation—"Arlington"— An original poem racited at the Ar- lington Memorial day services, May 30, 1922, by the author, Isabel Likens Gates. Contralto solos: Suite 1. a. “Salutation of the Dawn" (translation from Sanskrit) Stevenson b. “Were I Gardener"....Chaminade. ighty Lak’ a Ros “Were My Songs with Wings_Provided”. “My Heart Ever Faithful Mildred DeHart, pupll of Albert W. Harned, ~ Mr. Harned at the plano. Piano solos: a. “Paganini Etude in E Major" ... coooo. . Lisst b. " ......Rachmaninoft Claire Philomede Sguedo, 13- year-old pupll of B. Frank Gaebest, Reading by Francis §. Browne from the works of Lucius Perry Hilla “the Georgla Cracker Poet.” a. “The City Choir Duet.” b. “How the Fiddle Sun Soprano solos: +...Nevin .Hahn c. d. 8 4 e e e e Eastern Standard Time). 12:30 p.m.—Stock quotations. 6 p.m.—Base ball scores; stock quo- tations; late news bulletins. 7:45 p.m.—Concert program: vocal, “The Post of New Y. Cresson; readings by Mr: Hagai 8 p.m- etector Connections” an “The Crystal Detector,” by Prof A. T. Van Dyk, radlo engineer. WVP—TU. 8. Sigaal Corps, Fort Wood, N. Y. (360 meters). 8:50 p.m.—Instruction in radio. 9 p.m.—Concert WWZ—Wanamaker's, New York (360 meters) — Eastern Daylight-Saviag Time—Deduct one hour. 1:40, 5:40 and 10:30 p.m.—Music and children’s stories. WGI—Medford Hilliside, Mass. (380 meters — Eastern _ DaylightSaviag Time—Deduet one hour). Day, e o 7:45 p.m.—News; muslec. 8 p.m.—'Language — Written and Spoken,” by Prof. Reed, Tufts Col- lege. f:ls p.m.—Muslc. 8:45 p.m.—~Harvard Male Quartet. WWJ—Detreit News (Eastern Stand- ard Time.) 9:30 a.m. — Tonight's dinner household hints (8360 meters). 9:40 a.m.—Music (360 meters). 10:15 a.m.— Weather report (435 meters). 11:55 a.m.—United States Naval Ob- servatory time signals relayed by telegraph (360 meters). 12:056 p.m.—Muslo (360 meters). 3:30 p.m. — Weather report (485 meters). 3:40 p.m—Market quotations (360 msou and r8). p.m—Complete sporf results The Arch Preserver Shoe Gives you Foot Comfort with the Smartest Style! 'OU can walk or stand as much as you like when you wear Arch Preserver Shoes because they prevent all strain on the feet. Just as comfortable as going ‘bare- footed!” This shpe gives you foot health and vigor combined with correct styles for all occasions. Let us show you. Brown or Black Oxfords, $9 and $10 White Reignskin Oxfords, $8 3 “Foot Comfort Depts.” for Cor. 7th & K 1318 G St. A4St world news (360 meters). 8:30 p.m.—Program of music by De- troit News orchestra, Mrs. Harry Bowlsby, soprano; Mrs. Irene Whit- taker Stephenson, pianist. The Town Crier. Carpenter and Coughland, In popular hits; Roland Baker, baritone: Edith M. Ruebekam, lecturer (360 i meters). INSTRUCTOR NEW YORK. KDKA — Westinghouse, Pittsburgh < (360 Meters — Eastern Standard Time). Heterodyne Action. Suppose that the frequency of the oscillations jn a recelving antenna ls 100,000 cycles per second when that circuit is in resonance with the pass- ing electro-magnetic waves sent out from a transmitting station. And sup- pose that these oscillations are un- damped. No sound would be heard in the telephone recelvers, even though the oscillations (alternating current) were rectified, because the telephone diaphragms cannot vibrate that rapid- ly in the first place. But suppose a very small generator of undamped waves were placed in inductive rela- tion with the antenna circuit. And suppose that this local generator, or minfature radio transmitter, were ad- justed so that it generated oscilla- tions of 101,000 cycle frequency. Due to the close inductive relation, oscil- lations of this lgcal frequency will be forced to flow in the antenna cir- cuit along with_the oscillations due to the signals. We have oscillations of two frequencies, 100,000 cycles and ® to 9:16 a.m.—Music. 11:30 am. to noon.—Music. 2:30 pm.—Results of all base ball scores by innings. 6§ pan—Weekly dress talk; base ball scores; theatrical features. 6:45 pm.—Special news; weather report. 7 p.m.—Base ball scores; “Preamble of the Constitution,” and “Flanders Field,” by R. R. McWhinney of Pitts- burgh; “In Memory of Those All Whom Gave Much and Some of Whom . Stotler of Pitts- league | 7:30 to 8 p.m.—Bedtime and Uncle Wigglly stories for children. 8 to 9 pm—A variety of vocal and instrumental selections by N. J. Ca- ton, tenor; Elizabeth Coles, violinist; Gertrude J. Hess, soprano; Virginia Baldwin, reader; Norman Janovsky, ritone; Miss Ellenor Steinbrenner, accompanist. 9:55 to 10 p.m.—Arlington time sig- nal Meters — & | 101,000 cycles, present in the antenna Time—Same as Eastern Standard: st the same time. These two fre- Time). quencies will also be found in_ the 5 a.m.—Opening market quota- tions, Chicago Board of Trade. 10 a.m.—Market quotations at one- half-hour intervals until 1 p.m. 1:20 p.m.—Closing market quota- tions. 2:15 p.m.—News and market re- secondary circuit. The curious thing Marine Engineering and Shipping Age: program of music. ‘ 3 p.m—Program of music. ports. 4 p.m—Base ball scores; women's 3 pm-—American and Natlonal | fashion news by the Women's Wear league base ball team line-ups; prog- | Daily, fashion newspaper; program ress of games every half hour there- | of music. after until their close. 5 p.m.—Base ball scores; program of 4:15 p.m.—News, final market and{music. financial returns. 6 p.m.—Weather forecast; icul- 6:30 p.m.—News, final market and |7 PR RSN TUNCCT ehipping fnandal returns. bedtime | PEWS- 7:15 pm. — Children's bedtime | "¢ 5 : Storiee taks DAl Taport: 7 pm—Final base ball scores; $ to 9 pm.-—Program, courtesy of| children’s bedtime stories; music. Lyon & Healy, consisting of Lieut.; 7:45 p.m.—"Gold Star Mothers,” by James Sylvester, bugler; Clement| Alice D. Stueck. Mullers, soprano; Jennie Durkee, ban-! 7 pm—*Broadeasting Broad- jo-ukulele; Marfon McGuire, reader:iway by Bertha Brainard. York Community High School Chorus! " § 'pm—Aemorial day address by with John C. Minnema, director:; Wil-{ capt”Warren B. Coon, former chap- liam Beller, pianist: Alexander Har-!iain 113th Infentry, 2Sth Division, ley, violinist; Clarence Yeaw, cellist,| A" £ F., and New Jersey state a and Irwin Jensen, baritone, With|gsemblyman. Patriotic program of Ethel Bosworth, accompanist. . "lnciading & solo. “My Ow 9 pm—News and aporte United Statés,” by G. Early Kindle- 9:06 p.m.—Special features as an-|perger, tenor. ounted by t&tloiptionte p.m.—Bugle concert by Charles Dnerr of Newark. 9.30 p.m.—Recital by Lucille Col- lette, violinist, of New York city. 1052 to 11 p.m.—Arlington time signals. / 11:01 p.m.—Weather forecast. WJZ—Westinghouse, Newark, 3 (360 -Meters — Eastern Dayligh Saving Time, Deduct Ome Hour. 9 am—Agricultural reports and rices as released by New York, New Sersey ‘and federal bureaus; program of music. 10 a.m.—Program of music; Duo SENT FROM HOSPITAL. Art recital Maj. John E. Beller. Ordnance De- Noon—AgrTicultural reports; weath- er forecast; program of music; Duo Art recital.’ . 12:15 to 1 p.m—Standard time sig- nals from Arlington. 1 p.m—Program of music. 2 p.m—Shipping news partment, and Capt. Einar W. Ches- ter, infantry, have been relieved from further treatment at Walter Reed General Hospital, this city, and or- dered to thelr respective stations, the former at Watertown, Mass., and the latter at Boston. by the - Y.M.C.A. RADIO ScHOOL is, however, that the currents of these two frequencies alternately add to- gether and subtract from each other in varying amounts periodically and produce a third current of a lower frequency. This lower frequency in the case assumed is 1,000 cycles per second, the difference between the two others. This frequency is anm audible one, and upon rectification the current of this frequency will produce audibie impulses in the tele- phone receivers. The ordinary crye- tal detector may be used for rectifica- tion in this case. The interaction of two frequencies to produce a third and lower fre- quency is called “heterodyne action’ If vacuum tube circuits are used they may be arranged so that the local frequency osciilations are self-gen- erated. ‘This is called the “autodyne method,” and the local oscillations are self-generated by the detector tube in a so-called “regenerative cir- cuit” This will be taken up in more detail in a later article. In the case considered above a small arc or a vacuum tube generator may be used for producing the heterodyne action. In practice a vacuum tube generator of very small power output is used. It could be a single tube generator. SIMPLE RADIO RECEIVER WITH 300-MILE RADIUS A simple radio recelving set, cost- ing about 25 cents, which will pick up radio phone messages broadcasted within & radius of 300 miles withou amplification has been designed by C. A. Briggs, 1521 Oak street. Mr Briggs has followed closely recent developments in amateur radio, and his knowledge of the metric system and its extraordinary simplicity sug- gested the idea of constructing the simplest possible radio recelving =et. Aside from the antenna, ground wire, detector and phones, which are necessary to all sets, the arrange- ment consists of two simple coils wound on strips of flat carboard. Np variable condenser or sliding con- tacts are necessary. All tuning within the range of the set can accomplished by sliding one coll over the other, first using the upper one with one face turned to the top, anfl then with the other face turned up according to the wave length of the incoming signal. . The cost of all the material actually entering into the set, aside from the antenna and telephone receivers, wif be about 60 cents, which includes the cost of the crystal detector and all necessary screws and other metal parts. As some of this material cap usually be found around the average house, the actual cost in many cases probably would be limited to 20 or 25_cents. . With this set a radio message broadcasted from Schenectady, N. Y. 300 miles away, has been heard if ‘Washington without amplification. AR\ Bagey Ask any one of the millions of Ford owners and they will tell you, that for pleasure, convenience, utility, service and economy, to Buy a Ford—and Spend the Dif- ference. F.O!B. DETROIT Terms if Desired Authorized Washington Ford Dealers STROBEL MOTOR COMPANY 1436 Irviag St. NW. HILL & TIBBITTS 801 14th St. N.W, PARKWAY \ TRIANGLE MOTOR OO. N, Y. Ave. at N. Capitol St. HANDLEY MOTOR CO. (Iasc) 2 Georgia Ave. and Quincy St. NW. STEUART'S GARAGRE 141-151 13t Bt. N.EB. 1439 MOTOR COMPANY 1085-1067 Wiseousia Ave. R. L. TAYLOR OCOMPANY 1840 14th St. N.W. UNIVERSAL AUTO CONMPANY (Ime) 1530-31 M St. N.W, DONOHOE MOTOR COMPANY , 515 Peumsylvamis Ave. 8.E. ROBEY MOTOR COMPANY L st NW, All Dealefs Are Equipped to Take Care of Battery and Generator Work