Evening Star Newspaper, July 10, 1922, Page 14

Radip Tochuology. Modern radio has not only proved & godsend to countless thousands ot People, but it has also resuited in discoveries of tremendous benefit and valye to mankind. T audion, or vacuum tube that made TAZlo phony possible is one of the moat re- markable appliances ever invented and by its use almost miraculous things have been accomplished. The most remarkable thing about . the little tube is its pawer to magnify or amplify sounds. Noises so faint that they are absolutely lnaudible to the human ear can be increased until they fairly roar throughout a room when magnified by the tube and in & thousand ways this property has been nd others in ocon- m and making un- f discoveries. By means of the vacuum tube we hear voices, music and speeches car- ried on invisible waves through the ether for many miles; with it we can measure the depths of the ocean; by its use we can detect the presence of ubmarines when they are ::ved thousands of lives at se combined with other instruments it can be made to record human will power and possibly human thought; through its almost uncanny propel ties we may be able to hear insects talking to one another. ‘We can even listen in o human heart and actually h beats even when at & medical sclence this is o most value. A patient may be left undisturbed, yet, when sleeping or waking. his hearth beats may be heard, counted and watched the nurse or physic in attefidance ‘without the use of stethescope. In clinics, too, this will prove of | o tremendous value and Interest, as well as in medical schools. The lec- turer can illustrate his theme on the heart and lungs by means of radlo. bringing the heart beats and breaths of a I“‘j‘“ into the room so loudly that all may hear,. and in addition vastly valuable data may be obtained upon the action of our hearts and by this invention. aps you wonder how the vacuum tube and radio inatruments are used to record heart beats and magnify them sufficiently to be heard through- out & room at a distance from the Datlent or the subjec ‘The apparatus el arrange- ment of simple instruments and oper- @ates on principles well understood by every one who has taken up radio seriously. Describes Medical Apparatus. As shown In the diagram, the s of only five earbon grain phone_ transmitter, & five-sta, amplifier, 2 moving wire telegraphone, @ three-stage audio amplifier and a loud s er or telephone receivers. ‘The transmitter, provided with L r_cushion and suitable ments for fastening it to the chest, i{s connected with the fi' BY RADIO TODAY Complete Programs of Radie Broadcasting Stations. NAA—Naval Radio Station, Radle, Va. 45 to 9 a.m.—Live stock receipts; 1 stock market: 10 am.—Weather forecast for New England, New York, Pennsylvania, New Jersey, Maryland, the District of on 2.9 a.m.—Meteorological re ors. 11 to 11:30 am.—Hog flash— Chicago and 8t. Louls. 11:40 a.m.—Fruit and v’lo- and ship orders on 3, o to 3:35 p.m.—Fruit and vege- ta. 5 p.m.—Crop reports and al market news. 4 p.m.—Closing live stock ‘u“ 4:15 p.m.—Hay and feed mar- m.—Weather report. 6 p.m.- |¥ marketgram. sighal; wi 10 am-~Weather report for the District of Columbia, Pennsylvania, Ohle, Maryland, Virginia and West ' Virginia. 1 (trult and ble: :30, B marketgram telegram. p.m.—Wholesale dairy report on 0 meters by radiophone. 0 and § .—Market report on .. o meters by radiophone. 0 p.m.—Weather report. WPM—Thomas J. Williams, Ine, (360 Meters). 13:30 p.m.—News items; reports on | Ern stolen automobi] 8 pm.—~Plano tiona, solos, M Dorothy Smith, soprano, accompanied by A. Gumprecht at plano, selected; solos, Miss Estella Thomas, vielin, accompanied by Marjorie Davis at elected; solos, Mras. Kate I wh , accompanied by C. Lippert, (s “Crimaon (b) “Bilent " (e) solos, Mr. WVP—United States_Sigual Corps, Bedlees Island, N. Y. (14850 Moters —=Basterz Daylight-Saving Time— Deduct Ome Hour). 2 0 p.m.—Instruction in radie. p.m.—Concert. 3 WGl—Amrad, Medford (300 - Meters — Bastern Daylighte Savisg Time—Deduct One Howr). 3:58 p.m.—Muslo; current events. cinged By radiopnons, o o 4 noun y radio . 180 ball soores; late news 7:30 p.m.~"The Family Circle,” con- ‘dluwl’ D;vl: M. Czuuy for the Youth's ion, lunfl lecturer on .. con, vielinls B Roox, ek Barasate), “Souvenir” and (braia), “Vienness .l"nnmu oV Jal ;| accompanist; Ernest amplifier. This is operated by stora battery, which also supplies the cu rent for the motor that runs the t .fngrh.onn. ‘The latter consists of & steel wire traveling between two volving pulleys and with magnets placed close to the wire. The first of thege magnets is can- to the” five-stage amplifi This is known as the “recording net,” while the other, known as reproducing magn is connected with th o re ulg!lflor. as listrated. In l:l‘:l‘l’lfll, ore 1z desired. increase or de- fluctuating cur- ctly as roduced by the vibrations n a telephone transm! np;ulnl' through the five stage amplifier, are greatly increased, and p. ng throu the coll of wi about the recording mi varying aegrees of magnet. As the telegraphone passes net the latter produces magnetized areas or spots in the wire, the degree of magnetism produced varying with the current flowing from the amplifier through the recording magnet. Then, as these magnetized areas on the wire pass the reproducing magnet, they in- duce magnetic impulses in the latter and these in turn cause varying mag- netic flelds which induce pulsations of current in the colls of wire about the magnet and which are carried to the thre nstko amplifier and hence to the e ‘6 & long record s being made, physician desires to hear the heartbeats continuously, ff m is switched o the wire and the records from the recording wonder why all is necessary, why the pulsations of the heart can- not -be amplified and passed to the d_speaker direct without the use t.:iho‘.' 8o they could egraphone 'ia a very adjunct and, moreover, by use of this very si affalr, manent records of may be secured which may be repro- duced at wjll at any time or in any place, even thousands of miles from where the heartbeats were or_long aft ards. ‘This mi em almost miraculous, e must remember. that the steel bearing its varying degrees of magnetism are just a3 much a record as the wax diac of & phonograph. While they are invisible to us, the spots or aress of meagnetized steel produced by the recording magnet Just s# truly impressions on the the tiny serrations on the are sound-wave im- on the wax. oving the wire from the in- t the record may be preserv- ed and merely h{ placing it on the ulleys and running it past & repro- x magnet connected with an eartbeat impressed upon it may be heard, even though the wire has been shipped to some|,, far distant place. Truly, by means of this wonderful device, one's heart- beats may be heard around ‘world. (Copyright, 1933.) 6 pm~—Weekly survey of business eoua?tbl:; National Indastrial confer- ce 3 ."’l p.m.—"“Pythian Principles,” Ben- {Km:h;' 'l( o'r;y c& reme representative, 3 pm—Orchestral selections by the Edgar_Thompson Steel Works Orche: Walter Baille Brown, director. o - er), “The Sunny South” (Lampe), “Ever True" (Beyer), “The Stars and Stripes ForeverV (Sousa), “Ty Yee” Wi ‘Sextet” from “Lucia di Donisett!). Vocal mpan! m: Tenor solo, “The Sound of t! 'um”; bass solo, “The Bell in th Lighthouse”; chorus, “Remick's M ley,” “Comrades in Arm: m as the Night': quartet, “Little Tommy Went a-Fishing." Chicage (360 ~ fia n#‘ldfl“ KYWW, Meters — Central Time, Same as market quotar of Trad: 10 a.m.—Market quotations at eme- half-hour {ntervals until 1 pm. 1:20 pm—Closing market quota- jons. 3:15 pm~~Nows and market nrn. 3 and National line-ups; £ hour 4:18 p. reperts. 130 p.m.—~News; final market and ln‘u;fl‘;.l rlt bese bell D‘O”;'l“ us! rogram by Belle Lowney, soprano ’iunll Simmons, Bvana, baritone, d Mra. Esther Muallpr, accompan- A, Halac, clarinet, and Sallle Eva Lenshan or ?au’w"d 5 Curran, 'b'! Dongle Burt, ‘!r ald (5. ", . 1,” Spohr, “Spring Sonfi Mendelssohn, by A. J. Halae; (;I “Love Me or Net," Secchi, d “I Piteh My Lonely Night," Coats, by Xrnest “The Lilagc Tree, ant "4&- y‘ Same Old Wé!." Anon. i g‘l = N takes the b g e T S e i Yous. Tooes easant-tasti; abm- mul‘ . . THE aVEbadu b ot RALP ROION YoUR HAR 18 CAN 8B! —Youne BEEN SWIMMING !~ ~AND T TOLD You NOT' 10 GO!! | . —Agricultural reports and r:on" :n. released by New York, New Yuruy and federal bureaus; program Mfimdu Program of muasic; Duo am.—] - Art recital 2 Noon—Agricultural reports: weath-: er forecast; program of musls; Duo- al. 13:15 to 1 p.m.—Standard time sig- nals from Arlington. 1 p.m.— Program of music. 2 p.m.—Program of music. 3 p.m.—Program. of music. & 4 p.m.—Base ball scores; women's fashion news; program of musio 5 p.m.—Base ball scores; program music. n’l p.m.—Weather forecast; agricul- tural reports; program of music. § p.m—Business and industri conditions ‘in the United States as observed by the national industrial conference board. 7 pm—Stories from St. Nicholas | p; Magasine, courtesy of the Century " by R F. Brooklyn. p.m.—Caynce t by Jose Moriche, Program—“Sogno dl Ma non. H noncrede di tu de Mig: Horaias Pichins: T Basnere o “El Barbero a0 1lla. Rosini; “Elixir “A ancse 1 ‘Mayv] and “The Sun- shine of Your Smile.” ‘WWJ—The Detroit News (380 Meters). 9:30 a.m.—“Tonight's Dinner,” and a.l-nuhl talk by the Household editor, 9:40 a.m.—Physical culture drills by A : reproduced. her (485 meters). p.m.—] 5 p.m.—S8port results. 7 p.m~—The Detroit News Or- chestra; the Town Crier; Eth inger, sop! “The Lilac Tre Dawning I Quartet, ‘“The ‘Do Cry, Mah Honey'; George McDonald, Scotch ballads, “Hurrah for the High lands,” “I Think I'll Get Wed in the Hour). 7:30 p.m.—Base ball scores; bed- ime_stories for children. 7:48 p.m~Lecture and market re- Tta 8 p.m—Program of music; base e e e Bufiale, N. Y. Time— One Hour). Noon—Weather and market reports “s'gom '"’iv ther and market re. 30 pom.— - s porta meters). 8 p.m.—Base ball scores; bedtime ories for children; digest of day's news (360 meters). :18 pan.—Concert by Federhl Tel pho: and Telegraph Company (360 meters). 1Years 2 i WBT A [[{ You. vor osoeRYiNG: MorHER Yoy ! =~YoU COME UPSTAIRS Wi ME ! ~IVE QU TO PUNISH E.H. RADIO, EXPLAI INSTRUCTOR NEW YORK. AT Y.M.C.A. RADIO ScHOOL EFFECT OF THE GRID IN A VACUUM TUBE. It has been explained th: ed filament gives off part of tive electricity called “slectrons, that these electrons. Wwill go late if the latter is given a positive of electricity. The charge is given the P te by connecting & tery with its positive terminal to the plate and its negative terminal to one terminal of the fillament. The cur- rent flowing in this circuit, compri: ing the tube spac and plate, the battery and t necting wir depends upon the rate the electro are attracted to the late. Up to the time that electrons are attracted to the plate, as fast as they are emitted by the fllament, this “plate current” will increase with the poten on the plate—that tn this case, the voltage of the ba ory. The grid of & vacuum tube is al- ways placed between the fllament and the plate. Some electrons are then bound to atrik grid and Some will pass through the spaces between the grid wires and on to the plate. Suppose that the plate potential and filament temperature are kept constant, so that there certain plate current flowing. Al pose that the plate potential ough to attract electro: they are emitted by ti The cloud of negative surrounding the fllament will en repel back to that electrode all of the excess electrons. But sup- pose that the grid wers given a posi- tive charge by connecting the pos! tive terminal of a small battery to the Sure Death moths, bed bugs, fics, fleas and Cleans Bath Tubs, Tiles, Metal Fittings and Garbage Pails. grid and the negative battery termi- nal to o e filament terminals. It would then partly neutralize the of the electron cloud (or space ch: and assist the plate in drawing trons to itself. The plate circuit current would then be increased with increasing positive potential on the rid up to the time when the col ined effects of both grid-and pla caused eléctrons to be’ attracted to the latter as fas they were emit- ted by the filament. Some electrons 80 to the grid, of course, since thi grid is also now capable of attract. ing electrons to itself. This caus current to flow in the grid circult tween fllament and grid, through the small grid battery and the con-mun’ wires. And, also the higher the gri potential the gredter the grid cur- rent. But suppose that the conn tions of &he grid-battery are reversed, 80 that 1ts- negative terminal is con: nected to the grid. The grid then re- celves a negative charge and will the electron cloud (in the tube space) in repelling electrons back to the filament. This time no electrons will go to the grid and few will be able to get through the space between the grid wire: e plate. The plal thereby decreased, and electrons at all get to the plate. plate current then stops flowing or is cut off, and the particular value of negative grid potential which 8 _this cutting off is called the ut-off potential.” . to Roaches i Pourifiss Special combiastion packege. pist can and speayer, $1.00. Quat Can 503 Pint Can 50c. All Cans are fall standerd mensn Wdfiofié’lflvemye CMofar, Car Life. 10 Years oo & In buying a Westc.ott Motor Car; you are assured neatly twice the service yielded by the average motor car. The exceptional durab‘ilit‘y of Westcott Cars has made them famous. Lasting nearly twice as long, depreciation expense is greatly reduced and re- sale value kept unusually high. And these are the two most important items in figuring motor car maintenance costs. : Come and see the Westcott. Go over it earefully. Note how in major units and minor details everythlngulbout the ¢ar has been carefully and thought- fully planned, designed and You will be particutarly inte: ilt to maintain the ten years’ average life. rested in the Westcott California sze steel sheathed, steel braced, three-ply permanent top. It is the only car urnishing _such a top as standard eq new and up-to-date years a! replaced. , - ment. The Westcott top keeps the car Jooking ter the average top looks disreputable or has been Lighter Sis Opan and’ Closed Models, $16%0 to $2590 Lavger Sis Open and Closed Models, $1890 w0 §3090 . | EJ. QUINN MOTOR SALES CO. 824 Fourteenth Street . Clip t iamon For Tu;sday With this event we inaugurate a twice-monthl; tive kind. Every item listed is exceptional. g_uzlit & e Ry For Tuesday value-giving sale of the most attrac- All are seasonable. All are of the fi Read them over carefully, then CLIP OUT THE DIAMOND WHICH CON- AINS THE ITEM YOU WISH AND BRING IT TO THE STORE TUESDAY. Flawless values of the first water—they sparkle with quality and.low price. Men’s and Young Men’s BLUE SERGE SUITS —of very fine quality ALL-WOOL FRENCH SERGE. Beautifully tailored in two and three button models both conservative and snappy. Sizes 34 to 42. Price with this diamond, In blue. Sises 36 to 48. Clip this Dia- A mond and get them J 3¢ to ¢4 Ciip this Diamond— “We Request the Re the Diamond and the Beach and Linen sizes from 8 to 16. ‘With the Diamond— Made of real English . White or tan. Collar attached or neck. band styles. Some with slight imperfections. 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