The evening world. Newspaper, May 22, 1922, Page 12

J—PABAO By Capt. Robt. Scofield Wood. D. F. Oy M. Cu Grolx de Guerre with four, paime; formerly Commander 167th Squadfon, Royal Air Forces. RECEIVING CHAMPIONSHIP CON- Teer. * A feature of the Radio Show which opens to-day at the Tist Regiment Armory will be the ‘National Radio Speed Contest to be held Wednesday night The details of the contest were completed at a conference betw oMcials of the show and Chief Re apector Arthur Bachelor of the ment of Commerce, and the three wire less code demons. A suitable prize In the form of a trophy will ve awarded the winner of the contest. With the trophy will go the Radio Code World's Championship. In order that the contest may be fair the contestants will start at receiving code at the rate of forty words a minute and the rate will be increased at the rate of two words a minute until the winner is declared. While the contest is open to any one who can‘ qualify at a start of forty words # minute, there are only three persons being counted upon at present for the finals, Jose Seron ts the pres- ent title holder with a record of forty- nine and one-half words a minute Seron is the crack operator of the Radio Corporation of America. He is followed closely by HE. G. Seutter of the New York Times, with a record of forty- eight words a minute; and Theodore Mc- Elroy of the Boston Herald, who has an unofficial record of catching fifty and one-half words a minute, completes the trio and who is expected to supply the thrill of the occasion. It will be recalled that Seutter was the former title holder until last February, when the little Chil- jan lifted the honors at the Second An- nual Amateur Convention. It xpected that a new record will be established when these three masters dot and dash meet in the first “world's radio champtonship’’ contest. RADIO CLUB NOTES. The three radio receiving sets that will be given away to the holders of the lucky numbers will be on exhibition at the Radio Club Booth at the Radio Show which opens to-day at the Tist Regiment Armory. There will also be a box for questions, If enything puz- ales you and you want to know the whys wherefores of {t, write it out and look for tne answer to It in this column during the week. ‘The Evening World Radio Club mov- fng pictures, which are the finest that could be turned out, will be shown twice dally. These pictures are the efforts of the engineers of the Ameri-|source of them, world. Club members ave cautioned to bring thelr membership tickets with them #0 they will be admitted to the show for half price. If you are uot a member and are anxious to join a live .radio organization fill in the aecompanying application blank and mail it to. the Radio Editor, or fill in one of the appli they are the talk of the radio cation blanks at ‘The Evening We Hooth on the armory floor dure Ing the week. lverybody Is welcome There are no qualifications as to xex qualification is real interest in radio. HELPFUL HINTS ON TUNING All things being equal, the radio fan undoubtedly encounters more difficulty In tuning his receiver properly than he does in any other single phase of radio operation or installation. A T. Van Dyck, who is a radio engineer of the General Electric Company and_one of America’s authorities inthis feld, has compiled a number of helpful facts concerning tuning which will be found most instructive by Evening World readers interested in wireless. The basic, rule to be followed for best results in the tuning of a radio receiver fs to understand what each control doe: in @ general at least, and to the control in systematic and not hap- hazard manner, It is not necessary to know the theory of gas engines to op- erate an automobiie, but the driver must at least know what the function f each control ta to drive Inteligently, and the more he knows, the better ho should able to drive. So with the radio receiver; an understanding of the general principles of the set and Its con- trois is necessary in order to obtain good results consistently. In order not to digress from the sub- Ject of tuning ft wili be necessary to take something for granted. First, that your apparatus is some good standard make, or if home-made, is constructed and connected in one of the standard ways; second, that your antenna system 4s properly installed; that the aerial 1s suMeciently thigh, not too long or too short, 1s well insulated and as clear of surrounding buildings and trees as possible, that the «round connection fs a good one, and that all electrice Joints in the aerial and ground wirer are soldered, Then, too, all connections on the ap- paratus are to be well made and the batteries in good condition. In general, one cannot be too careful or too thor- ough in the installation of a set, if It tm expected to operate day after day with- out vexatious delays, hunting everlast- ingly for troubles and trying to correct them. Tuning in this article will refer to the process of adjustment, of receiving apparatus to accord with a particular transmitting station in order to obtain the greatest response to that station's new-born waves. A radio transmitting station sends electro-magnetic waves out through space in all directions, These waves as they get farther from the their creation get weaker. can Tel. & Tel, Company and some ex-| When a wire of the proper conductiv~ vated above the surface of the SRS AVERIS earth, It Ie struck by the passing ra- dio wa Radio vibrations are actu- ally moving electric forces, just a waves in water are moving mechaiil- they strike a wire we electrically, just ng.the water any object to move which ts iaced on its surface. The tuning of nerial t® for the simple purpose of adjusting it to give the kreatest response possible to the feeble force applied to it by the wave, t factor concerning these they have m definite fre- cal f und whel y cause It to quency, which means that a certain of them pasa the receiving a second. The exact number ned by the adjustment of the Since these waves travel eed, they muat be a cer- apart. ‘This distance ts ve length and is usually tres from the creat of rest of the next suc- that Instead of say- transmit at a certain tain distance led the wa measured in I one wave conding ane ing that « These vg aerials regularly one after another, and we to have them get up the maxi- im vibrations possible in the aerial Consider the analogy of a rope swing with one boy in it and another boy trying to swing the first boy as high ‘as possible. You know that the swing can be started and Sts motion increased each time it vibrates, even by very wonk pushes, if the successive pushes are timed to occur exactly right and fone does not try to push the swing at the wrong instant ‘The receiving aerial works in a simi- tar way, it corresponding to the swing fand the electro-insgnetic or radio waves to the pushes, the only difference being that in radio, Instead of changing the tate of the pusros to sult the swing, we adjust the length of the swing to sult the pushes. That is, we adjust the vi- brating length to sult the frequency of the waves, Then the antenna will swing electrically as far as it can, depending upon the strength of the wave pushes. ‘Therefore actual radio recetving sets have to provide some means for chang- ing the electrical length of the antenna. ‘This can be easily accomplished by in- sorting in the circuit a coil of wire with some means of changing the num- ber of turns in the coll for actual use; for example, by a switch or with some means for varying the electrical offect of the turns without really changing the number of turns—making some of them ineffective for the time being. The variometer ts such a means, and js made by having the coil in two parts, ‘one of which turns inside the other. It tw also That if there are connécted in the circuit two metal plates which are placed in close proximity to each other, but not touching, and one of them’ {s moved, this changes the elec- trical length of the circuit. Such a de- vice is known as a variable condenser. Sometimes, as a matter of fact most often, both condenser and coil, called variable inductance, are used. ‘There are two somewnat different ways of connecting up the tuning de- vices which are in common use to-day. These are known as the single circult tuner and the two cfreult tuner. In the operation of a receiver based on either one of these tuning systems, ad- justment of the tuner part is but half the problem. In addition to the tuning system, there in the detector, which ts connected to the tuning elements and which changes the received high fre- quency current into one with a form which will phones There are two kinds of detectors in operate proper radio une at present, the crystal or mincral detector, as it fs sometimes called, and the vacuum tube detector, so that there are four fundamental combinations |” ing a set—first, the simple circult type; second, the two circuit the single circuit last, the two tal crystal type; third, vacuum tube type, and, circult vacuum tube type, The single cireult crystal receiver '* In this there are only the tuning contro! The proper procedure of course the simplest to operate. and the crystal. in tuning this type Is to set the de! tor in contect and slowly vary the ing control until the desired signals are heard, then adjust tuning and contact to maximum rem diMcult part of this procs no signals are heard at fi condition or not. desirable to connect up oll buszer dry cell battery 80 as to teat the detec tor crystal and set it In ‘sensitive con dition. A crystal may also be tested ir ‘a house where there is electricity by switching on and off a lamp. This cre- ates enough electrical THE EVENING WORLD RADIO CLUB. Application for Membership. NaMO om ee ee es PRINTED—SURNAM® FIRST, Address . ween ene STREET, TOWN, STATE, ROCAIVING BOE we rmrarcccrsmcmemre: Broadcasting Set MYBO ests arioseusss MERION, ax neasesics Call Lettere a. Date meee. PRACTICAL Reg. U. 8. Pat. Off. HAIR CURLERS Three Sizes “WASH’— Don’t Scour Teeth! You Wouldn’t Scour the Piano Keys OU would not use a grit cleaner on your ivory piano keys. You know what it would do to them, you also know how readily they give up their dirt to gentle washing treatment. Ivory and teeth are first cousins —made of the same basic substance. Every time you scratch your teeth, you remove part of the surface. You can use Colgate’s Ribbon Dental Cream during a long lifetime without the slightest injury to the delicate enamel of your teeth. Y COLGATE’S CLEANS TEETH THE RIGHT WAY “Washes” and Polishes — Doesn't Scratch or Scour Jt. Loosens Clinging Particles (The most effective and trustworthy tooth cleans et for habitual use is one that offers the com- bined action of fine, non-gritty precipitated chalk and pure soap. Thus, in Colgate’s you get what modern science finds best. ! Moredentists prescribe Colgate’s than anyother dentifrice, They rely solely on the merit of that article guaranteed by a rcputation of 115 years for Truth in Advertising ~Honestyin Manufacture.” nm Colgate’s cleans teeth thoroughly = dentifrice does more. A LARGE tube costs a5c—why pay more? 2. “Washes” Away’ Gritty, soapless pastes may show “quick results.” If you scoured away your skin nature could replace that. Silverware scoured with grit or harsh chemicals can also be restored if dam- aged. But even nature will not replace tooth enamel if once it is worn away. Decide on the safe and sane method of cleansing teeth. Better it ts to'use a safe dental cream now than suffer years of regret later on. heard tn the recetve a This click is not heard if the crystal is rot met at sensitive or audible edjust- ment, #0 that the detector can be ad- justed while some switch is being turned on and off unt ear Arlington oMcial time at 12:55 to 1 P. M. and 10:55 to 11 P. M. Baseball reports from 3 P. M. to 8 P.M. Shipping news at 2:05 P. af, Music every hour from 11 A. M 6 P.M. Weather reports at 11 A. M., 1 P, Mf it Is Im- ponrible to tell If the detector is in re- It Is possible door ® push button and a single 6PM conditions in the United States” as ob- served by the National Industrial Con. ference Board. caine | Magazine. 7:30 P. Richard sioner, City & P. M—"Bat and be Healthy, Mrs. Jenolse B. Short, Editor of try Housewtve's Forum, Pictorial Revi 9:80 P. M.—""Legendary Indian Tales by Princess Wahletka, an Indian pay hie, who will also give « demonstra- tion’ of her paychic tion, of Dower and mind WORLD, MONDAY, MAY 22, 1922.” harp click. — K DK A (Pittsburgh) 340 METRES. ] Naceeennneteennesnevenmeciainasioanes' the clicks are most heard loudly. 6. P. M—Weekly survey of business The second and final instalment of|°oMditions, National Industrial Con- this article will appear to-morrow, ference Board 7 P, M—"Women in Business,” Thyrsa W. Amos, Dean of Women, Uni- Versity of Pittsburgh. “Pharmacy,” W J Z (Newark) 360 METRES. Jullus A. Koch, Dean Schoo! of Phar- macy, University of Pittsburg 8 M.—Vocal selections by Robert baritone; George Thomas, tenor; Features for the day: Miss Lena Powell, soprano, and Mrs, Agricultural reports at 12 M ana ¢|Robert Johns, accompanist aatieninne 14TH INFANTRY PARADES. Veterans of Four Wars and 100 Gold Star Mothers Lead March. to] Veterans from four wars and more than a hundred Gold Star Mothers pa raded at the head of the 14th Infantry N. G..N. Y., in Brooklyn yesterday, in honor of the regiment's 75th anniver sary. ‘They marched from the armo: Righth Avenue, between 14th and 16th Streets, to Park Slope. Lieut, Col. Metz, former City Comp- troller, and Col. Fred W. Baldwin dug the first spadeful of earth in front of the armory, where will be erected a statue in memory of the 360 former members who died tn the World War. ‘The regiment served in the Civil and Spanish Wars and the Mexican border campaign. : Pictures of the regiment in camps at Sheepshead Bay and Spartanburg yl! be shown to-night. Maj. Gen. Bullard whi review the regiment to-morrow. :01 P. M. M. and 1 “Business and Industrial P. M.—Storles from St, Nicholas “Crime and ite Cure,” by Enright, Police Commis. f New York. tp Editor of the PI Pane rae Special for Tuesday, May 23rd Chocolate ; Assorted C Cocoanut Dips POUND NET Covered c Midget | Nutted Sticks Moguls About dainty, Regularly 59c POUND BOX delicatelyflavor- ed bars in ten pleasing flavors in attractively decorated metal box. 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