Evening Star Newspaper, May 25, 1922, Page 24

1 WASHINGTON, D, O, THURSDAY, MAY 25 1082 : (Oopyright, “ by the .‘ll!l ‘Newspaper Syadicsts.) / AE PADIPHONE [r Now HAs ‘ALmosT THE EVENING STAR, SINCE THE RADIOPHONE CARRIES THE RADIO-Y00-HoO, BEANIE! COME ON OVER TO RALF'S = IT /15 VAUDEVILLE HouR AT 'NIX' AN "THE CTHER EVENING INSTRUCTOR NEW YORK. Y. M.C.A. RADIO SCHOOL S THE ‘When crystal hich reauire a POTENTIOMETER. detectors are used local voltage for st operation. It is advisable, in ct. necessary. to provide some eans of varving the voltage ap- fed. The voltage is usually fur- shed by one or two dry cells such are used for bell ringing or igni- on. What.is to be accomplished is gulation of the applied voltage and e voltage divide or “potentiome- " serves the purpose very well, in- ed. =Referring to the that the resistance .nacted across) with 2 valus of only one tery E. M. F. is, let us volts. According to Ohm! current flowing _the re three amperes. Now the voltage, as measured by a voltmeter betweeén one cnd of the resistance coil or rod and its exact center, is the product of the current through the resistance, multiplied by the rceistance between those two points. This is just a simple rearrangement of the usual expression of Ohm's law. This volt- figure. 8uppPOs in ghunt (con- the battery has ohm. The bat- mperes times one- | ruals one and one- olts, c 1ld be applied to the detector. But the current of three ampercs. if zllowed to continue. will auickly run the dry cells down A fhigher resistance should be sub it conserve the bat- uppose a resistance substituted for the The current New Apparatus and Devices By Ralph Brown, Radio Engineer: DUPLEX PHONOGRAPH ATTACH- MEN' - people who have experienced noises from certain loud speakers with tin horns have turned o cthe phonograph sound chamber. S§veral devices flowing is now three volts divided by 500 ohms. or six-thousandths of an ampere. This a cons: woaker current and is no drain to speak of on the dry cells. But what about the voltage between the points previously considered which is ap- plied to the detector? It is found by multiplying_ six-thousandths eof ampere by 250 ohms. The result 18 still one and one-hal? volts. We get the same voltage to apply to the detec- tor and at the same time conserve lour battery. A little thought will show that moving the sliding con- nection indicated by the arrow to- ard the plus sign (positive end of resistance) reduces the voltage ap- | plied to the detector, and moving it in the onposite direction incfeases | that voltage. The range of variation in the assumed case is from zero to three volts. | 1t is best to have the weak cur- rent from the local battery pass thrcugh the crystal in a certain di- | rection. usually as shown in the fl- | lustration. This will insure a maxi- mum response in the head telephones I when the correct voltage is found. ! out which enable the phonograph to ! be used as a loud speaker, in connec- | tion with an attachment employing a |ratner special typs of telephone re- ceiver. It is not necessary, really, to buy anything except a device which can be used to connect the regular head telephones to the phonograph tone arm in place of the reproducer. Such a device is illustrated. There is {an aluminum manifold, which can be fastened in place of the reproducer to the tone arm. The other two open- ings of the aluminum casting have rubber protectors so arrangdd that the ear pieces can be fitted over them without damaging the rubber caps of the phones. The springy metal band with the small rubbér buttons can be clamped down on the head phones by means of the wing nut. The héad phones are then held ] securely in place. and the sound pro- duced py each ear piece goes directly into the manifold without producing any vibration of the metal parts. When the attachment Is made the phones rest upon the turntable of the phonograph. There is no possibility of damaging the table. The metal parts of the attachment are highly polished and nickel plated, {Ohio, Maryland, Virginia and West, {so that Its appearance is quite in jkeeping with a high-grade phono- have been broughtgraph cabinet. EXPERT ADVICE ON RADIO . 10.—Reading Diagrams and Symbols. BY A. HYATT VERRILL, Expert on Radio Technology. Very often, those who wish to make or install their own sets find them- selves completely at a loss wien they try to follow out the diagrams or illus- trations of radio apparatus. Instead of having the various parts labeled, let- tered or numbered many diagrams have them represented by conventional forms or fsymbols which , often bear little or no fresemblance to the real thing. Con- sequently, such diagrams are absolutely meaningless to persons unfamiliar with the technical side of radio design and engineering. Radio symbols are standardized and simple and easy to learn, every one interested in radio or in making his own radio set should be thoroughly familiar with the symbole. They are not numerous and e accompanying chart., Fig 1, shows all that are usually employed in_radio work. But in_interpreting these symbols do net think that because the two vindings of a coil are shown side by side it means they should be made that way. One winding always goes over the other. They are placed w#ie by side merely to avoid the contu- SUMMER SEASN " HARDONRADIS Disorders Range: From Weak Interference to Shop- Like Noises. Don't be surprised this summer it your new radio receiving set gives forth a first-class fimitation of - a bojlershop in full operation. instead o‘(.En anticipated lecture on the cul- tufle of silkworms, saye the bureau of standards of the Department of Com- merce in announcing that the “bad radio weather” season is now on. According to the bureau of stand- ards, these summer disturbances, called “strays,” “static,” “atmospher- ies” and other names, are in evidence from about April 1 to October 1. Their seriousness varies from weak inter- to a con* succeesion boilershop n’oll.'-s which may last throughout the » y radio engineers and scientists in an effort to reduce the Interfering noise caused by these strays. At im portant government and eommercl:l stations certain devices and methods ar§ in use by means of which strays considerably reduced, and it is le possible to obtain fairly rel able reception during the summer. Cofled Antemna Helptul. ‘The apparatus and metheds now employed at such stations are usually 100 elaborate to be used at the ordi- nary amateur station. One method ‘which the amateur will find helpful in reducing certain types of strays is se, instead of the usual elevated ténna may be constructed by w! & suitable number of turns of wire, ‘with proper spacing, on “a square wooden frame about four feet the. perty of receiving a : ‘when pointed in the tion from which the 18 a; and recéiving ted at righ slon of lines that would occur if drawn as they are to be made. Also do not think that the arrow drawn across the symbol fo! ari- able coil or inductance means that the two portions of the coil should be connected by a wire. Remember that the proportions of the diagrams are in no relation to the real propor- tions of the set or that the wires must be run straight and parallel with right. as shown in the drawing: This is done merely to make the diagrams look better and In wiring a set g the wires parallel if it is possible; keep the wires short; do not let them touch where they cross and run them in whatever dircction and at any angle which is most convenfent. Finally, do not think that because batterles are shown wdthin the wiring of a set in a diagram that you must arrange your set so the batteries are in- cluded. This is merely done for con- venience in drawing. and some idea of the difference between the actual wiring of a set and the diagram for the same sét may ‘be obtained from Fig. in which A shows the dlagra as drawn and B shows the wiring oi the finished set on its panel. (Copsright. 1922.) Tomorrow—‘How to Use Soldering Tools." Aveatly reduced and a better radio ef “ignal to strays will be obtained. The ordinary elevated antenna does 10t possess marked directional prop- erties, and therefore cannot be used like the coil antenna for stray elimi- nation. However. the strength of sig- nal picked up by a coil antenna is much smaller than the strength of signal picked up by the ordinary ele- vated antenna, and good results should not be expected from a coil an- tenna unless three or more stages of amplification are used. Ground Wires Useful. Some relief can also be obtained by persons having good amplifiers by using a ‘“ground antenna. This is a long insulated wire run in a shallow trench or on /the surface of the ground. The ground wire should be run in the direction of the sdtation from which tke most signals are to be received, and should preferably be several hundred feet long. better results can be obtained in re- ceiving strong signals than weak sig- nals. Nearby stations can be received much better through the strays than distant stations. It is therefore for. tunate that broadcasting stations a: being established at a considerable number of different cities located in 11 parts of the United States, so that for most parts of the country there is b: casting station from which tion can be expected even when strays of moderate intensity ex- ist. In the summer a person m content with weaker plified as well as th gnal f con- siderable amplification is used, strox:“ tray disturbances will produce noises in the telephone receivers which very unpleasant and make it almost impossible for an operator to keep the telephone receivers on the g for any considerable length of tim TWO PERISH IN FLAMES. Two Others Burned as Spark in Grate Sets Fire to House. Mich., May 25.— | Ad two hi destroyed received Chris BATTERIES TRANSFERRED. Orders ha by transfer ot'l.rll- fl. it "1.&‘: and 3 from Camp to Cam L Through strays of given ln(enlllyl DOUG FAIRBANKS 1S GONNA SING 'ER SOME'IN' BY RADIOQ TODAY . Complete Programs of Radio Broadcasting Stations. NAA—Naval Hadlo Station, Radio, Va. 10:30 a.m.—Meteorological report on 5,950 meters of arc transmitter. Noon and 10 p.m.—Time signal, fol- lowed by weather report and ship orders. 10:30 p.m.—Naval press news, wave, length, 2,650 meters. Ofice Departm: a.m. ather report for the District of Columbia, Pennsylvani: 1 m.—Marketgram (fruit and; 1.100 meters. | 2:30, and 3:30 pm—C. W. Marketgram telegrams on 1,9 me- ters. 5 p.m.—Wholesale dairy repért on 1,160 meters by radiophone. 7:30 and 8 p.m.—Market report on 1,160 meters by radiophone. 9:50 p.m.—Weather report. Virginia. 16:30 vegetables) on 12: WMU — Doubleday & Hill Electric Company (860 Meters). 4:30 to 5:30—Base ball scores an- nounced. “Pagliacci” ténor (Leonca- lingsrauschen, plano ngs of India." fox tro Itz (Thompson piano (Gillet) x trot (1A J% o:n piano (Pader fox trot (Ro wan Berceau,” pilano (Mos| and,” fox ‘Scherzo,” plano (Chopin): raby” (Sm “Carmen.” plano (Brzet). scores announced. | 8 to 9—Concert by the following local A Mrs. Elizabeth Thorn- berry, soprano; Mr. Horace A. Lake, baritone; Mrs. Howard Blandy, ac ist. “Come to the Garden,! “Irish Love Song | (Trotere). “I Passed By (Brake), “war" (Rogers), Mr. Lake: “Jehlum River” (Wood: forde-Finden)., Mrs. Thornberry and! “A Spirit Flower” (Camp- ‘Bye-Lo” _ (Perkins) (Wave), Mrs. Thorn Y. f 4D‘H‘n’.xl-delon.f"gun chinell lloy). “Pipes of Gor- don's Men” (Hammond), Mr. Lake. WPM—Thomas_J. Williams, Inc. (360 Mete: . 12:30 p.m.—News items; réports on | stolen automobiles. 3YN—National Radio Institute (360 Meters). 6:30 to 7 p.m.—Radio spark code. WPV—United States Signal Corps (360 Meters). 8:50 p.m.—Instruction in radio. 9 p.m.—Concert. WWJ—Detroit News (Eastern St \ ard Time). 0 am.—Tonight's dinner and household hints (360 meters). 9:40 a.m.—Music (360 meters). 15 a.m.—Weather report —United States Naval servatory time signals relayed by tclegraph: (360 meters). 12:05 p.m.—Music (360 meters). 0 p.m.—\Weather report meters). 40 p.m.—Market quotations (360 meters). 5 p.m.—Complete sport world news (360 meters). 0 p.m—Concert by Corrine De| Wolfe. soprano; Blunis Orchestra; G. | Hamilton, violinist; Cyril Kuzemael and Leo Robitaille, vocal duets (360 meters). (485 | (485 results; | WGY — General _ Electric Company, Schenectady, N. Y. (360 Meters— Eastern Standard Time). 12:30 p.m.—Stock quotations. § p.m.—Base ball scores; stock quo- tations;"late news bulletins. 7:45 p.m—Concert. | KDKA — Westinghouse, (300 Meters — Eastern Time). 15 a.m.—Muslic. m. to noon—Music. —Results of all league base s by Innings. i ase ball scor theatrical kly dress talk. m.—Popular concert. 45 p.m.—Special news; government | market report; summary of New York j 8tock Exchange; Weather report. p.m.—" “Why & Corporate Trustee?” by C. F. Zimmerman, secretary of the ! Pennsylvania Bankers' Assoclation;, “Relation of Depreciation to Federal | Income Taxes,” by Robert C. Mont- omery of the United States Treasury epartment: base ball scores. 7:30 pm.—Bedtime and Uncle Wiggly stories for children. 8 p.m.—Program of music by Berg's string entertainers—W. W. Hohn eel guitar; W. Barth, banjo-mand lin; L. Hohn vocal selections oy Lyda Peterson, concert soprana. :55 to 10 p.m.—Arlington time slgnal Pittsburgh Standard KYW—Westinghouse, Chicago (360 / Meters — Central Daylight-Saving Time—Same as Eastern Standard Time). | 5 l.m,—ognuln market quota- tions, Chicago ur!nt ‘Tra h 10 a.m. ket quotations at on half-hour intervals until 1 p.m. p.m.—Closing market quota. 3 p.m—American and National League base ball team line-ups; prog- ress of games every half hour ther: after until their close. p.m.~—News, final market and nclal returns. / 6:30 p.m.—News, final market and S B Cnllacen's bedtim p.m.- Iren’ 6 story. 8 to 8 l1;.1.-»1’:«:".::: ot music By Luells Meluis, coloratura soprano; ele Brandt, contralto; David R. P«uhln{. bass; Helen Hadl ac- co st, and -the boy cho! 0% the First Congregational Church. p.m.—News and l‘ml. 9:05 rm—-fl ures as an- noun: by ne. WIZ—We : (300 A ing a.m.—Agricultural Ngdfll rices released by - y 3.1myv'ru federal “‘uu”n.".' 0. —Progrs music. | e of music. arl, N. 3. o ‘and New v —lol——lolc——ol—2jc——|al——o]lc——=]olc——/—=lale——lolc—2lol—2jo|—— 2 lal—— ol —— o] —=|a] 2' p.m.—Bhipping news; program of usic. 3 p.m.—Base ball scores; of musie. 4 p.m.—Basge ball scores; of music. 5 p.m—Base ball scores; of music p.m.—“Review of “the Iron and Steel Industries and Their Relati; to general n m program program program business condit by. ecital by Miss Emily Beg- lin, soprano, formerly of the Metro- politan‘Opera Company, with Frederic W. Vanderpool, the composer at the plano; final base ball acores. 30 p.m.—Concert by the Temple Male Eight. 10:52 to 11 p.m.—Arlington time signals. 11:01 p.m.—Weather forecast. ASSIGNED T0 FORT MYER. First Lieut. James B. Patterson, cavalry, at Fort Riley, Kan., has been assigned to the 3d Cavalry, at Fort Myer, Va. but will be temporarily stationed at Camp Harry Jones, Ariz. in connection with summer training camps. '{/sueuos soLo f UNTIL OUR /7, RADIO-FoAMED!! 5 heads the division for the visitatioff |not only can the blind man now havé of adult blind, connected with the|the advantage of current news, but he e department of public welfare. |can listen to concerts and lectures. | The use of radio equipment b; ; blind pessongr Mr. Comutnck said, | heve alréady equipped my home wity radio and am receiving news di- “is undoubtedly_the greatest blessin, and comfort oceurring in this era” |rectly from a central station In Chi- He declared that this new invention|cago, which makes a specialty of makes it possible for sightless per-|sending ouf bulletine for blind per- fonk xol receive ‘n:u d:fl.\- ‘\:'nho'lln - For the past several evenings aving it read to them; that the state| I have been listening to concerts Py, the Assaciated Trws. g now has paid readers at the School|given in Detroit.” = SPRINGFIELD, 1L, May 25.—Radio|for the Blind at Jacksonville and the| Use of radio in the State School at and the broadcasting of news and |Industria]l Home for the Blind in|Jacksonville and the Industrial Home concert music through the alr, was | Chicago. in Chicago is being contemplated, ac- declareq here today to be a godsend | “With the installation of radio|cording to announcement by Judge to blind persons by Charles E. Com- | equipment,” Mr. Comstock said. “their |C. H. Jenkins, director of the state stock. sightless from Infagcy, WO |services can be dispensed with. And|department of public welfare. BLIND FIND RADIO * GREATEST BLESSING Bightlees Illinoisan Tells of Ben- efits in Dispensing With Those Paid to Read News. b[e——lo]e——ol——=ol—F——ol— ol ——=|a|—— o] c———=lol—=lal———2]c]——[d This Interesting’ Novelty g’oesto you 20c o] = beginning with the next Issue of rder The Sunday Star Today So you will be sure of having the first copy of the Invisible Color Book for the children. 5¢c a Copy —at your newsdealer’s Per Month- by Star carrier. A AW Sunday-—and Every Sunday with The Invisible Color Boo Another feature which is added to the Sunday Star—for the in- terest of its juvenile readers—entertaining and mystifying. Each of the four Invisible Color Pages comes to you with The Sunday Star—printed in plain black and white. With an ordinary brush or piece of cotton and 3 cup of water—presto! You trans- form these plain pages into brilliantly colored pictures. You don’t have to be an artist with, the Invisible Color Book— and you don’t have to have paint even—a brush and water—and the pages will be aglow with artistic and gaily colored pictures. / Next Sunday’s Star will bring the first issue of the Invisible Color Book. Every youngster in Washington will be all excite- ment to see these mysterious pictures grow into radiant colors un- der the magic touch of brush and water. _Bgsides the Invisible Pictures —Are four other pages of cut-outs, drawing lessons, stories and i other features “entertaining to the boys and girls. lc——lole—— 0 ——|o|c——|0|—a|—|c—]0|———]|0|—2|o|c—2 o] — l— 0| =—3 | 0] 00— | B | —"o | O] =