Evening Star Newspaper, September 6, 1925, Page 9

THORIATED TUBES - AIDTOIGE PATROL New Radio Detector, Found by Accident, Making Ocean .. Travel Still Safer. making ocean travel still L. A. Hawkins, engineer in e of the research laboratories of the General Electric Company, Sche- nectady, N. Y., s in a narrative of sclentific progress issued by the Engi- neering Foundation of New York, the ch agency of the four Founder Societies of Civil, Mining and Metal- urgical, Mechanical, and Electrical New safeguards are being developed and the ice patrol is now able to flash without interfering with broadcasting. Thorlated s, product of science and ed as a forward ission both in ection of science and in pre- the loss of human life. Of tats invention, which comb thorium and tungsten, both metals, new uses to mankind, the Foun s narrative say ol warnings from while reaching much ever before, will no source of interference ific and broad- Under favorabl ected that direct be 1 with in Washington.” anic Brought Research. | t gbjectives of scientific » elevation of human life human lives, according rative, which says that were shocked into ement by the loss of )12. One of the im- | was that the undertool the ice pa- A - at the re- ternational Conference ne this 1 consequences eat a responsi ative continued, “our ent has constantly been alert e every aid which science two Coast G Modoc, em e equipped telephone | ters car. American contained tungsten ansmitters ed thoriated sub. soon radio- | radium by invention | en for s now a > lights, and rms illumi- orium was ound to b qu. of the wetive one ent Placing Tcebergs. the ice patrol consists ling bergs, but also in <ly to s at sea of the whereabouts Most ships re now : hence patrol boats with transmitters which ers antic produced - the purpose of providing de- le, long-range, high-powered Guard com- Com- | ter espe- The equip- compact that it a small radio room. compact the volt- required to be s to be all of ) that the oper- exposed to danger- thrown against the apparatus in heavy » kel e ice ad to d fit into pat bility and simplicity were demanded. The wave length, or frequency, absolutely 'independent of ue to rolling and pitching All these requirements d vari of t were ship. Tube Was Problem. test among the problems | ment of a high-powered, vacuum ' tube. - Available low-volt using up te volts ¢ obtained generator, and high, wting on 10,000 wolts or ont d this latter high ard would have re- tor se step- fer with two tubes and an elabo- smooth out the ripple in d wave, h _specialists produced a rated at omly 2,000 volts on te, but four times as powerful ous -low-voltage tubes. Its 1,000 wat By means of power is supplied from the wrent motor-generator set, ing the transformer, kenetron, and filter, heretofore neces: G: the low-volt | 000 overy and development of sten for this purpose re- om the nation of a nvestig nd_a_happy Investigation of the so- ' in incandescent angnuir led to ctors gov- | rons from hot filaments. Tn one-"se tungsten was made hi xperiments with the vacuum nd higher, electron emission unexpectedly became stead- | greater, until finally, when the s fmmersed in liquid air, the sion was 10,000 times its original value. Thorium Discovered. “This was an astonishing result; but when the experiments were re- pegted. with another lot of wire no such increase in emission developed. An investization of the two lots of Wire revealed the fact that the second was pure tungsten, but the first con- tained thoria; often used in lamp fila- to prevent excessive grain on_burning, which induces This enormous increase in would not have been ob- ved under other than the very spe- tions of the experiment. or study disclosed the fact when a tungsten filament con- thoria is operated under the conditions the thoria is reduced m, which diffuses to the sur- there forms a_continuous - one atom deep. The electron ission is then that of thorium, hich is much higher than that of sten, while the high affinity of um for tungsten prevents the ce thorium from evaporating as it the whole filament were i and Y accident the filament is over- heated, and the surface layer of thor- fum is evagorated, the filament may be ‘reformed’ by running it at high temperature for a short time, so as to cause more thorium to diffuse to the surface, and then bringing the temperature back to normal. cause, of the high electron emis- sion of thorium, a thoriated tungsten iment is very efficient, so that_in the small 8izes used in receiving tubes 2 number of filaments may belrun from a set of dry batteries without unduly shortening, the battery life. In power tubes, with large. flaments, the life is very great because of the low operating temperature of the fila- ment, which the emission character- istics of thorium make practicable.” THE SUNDAY STAR, WASHINGTON, D. C, SEPTEMBER 6 LONG RANGE RADIO ENTERTAINMENT SUNDAY, SEPTEMBER 6, 1925 : Progrems of Distant Stations Scheduled for Eastern Stc-da;d Ttme 8 TO » AM. 8:00—New ‘York: Chfldren's hour: comic stories Stations. Muters. Mil Wiz 3 9 TO 10 AM. E 1by N s_from Grace 3—Schenectady: First M. E. Church X oo Pittsburch: “Church services Philadelphia: Holy Trinity Church’ services . 10 TO 11 AM. t urch of ¢ New York' Soventh Church ot Omaba: Chapel services by Rov 11 A hedral C R. R TO 12 NOON. 11:00—Chicago. Second Presbyterian Church services . Lo ourth Avenue Presbyterian Church services Paul's Episcopal Cathedral rvices : Church of the Covenant services .. 12 NOON TO 1 P.M. : University Church services .. prings: port talk: Meyer Davis' Orchestra . York: Marsh McCurdy, concert pianist ... Minneapolis 12:30—Boston: Concert program. Westminster Presbyterian Church services. 17O 2 PAL 1:30—Atlantic City .. Presbyterian’ Chureh New York: Radio forum 2:00—New York Davenport New York Warner's Theater pro Palmer Little Orchy Sunday bymn. sing' 8:00—New York: . Cineinnati 3:15—Atanuc Cits 7 Spiscopal Church, WIP. 3:30—Cleveland: Musical Program rmonet 4:00—Chicago: Studio concert New York 8 Roseland Dance Orcliestra Seagide Hotel Trio: sermon from Westminster 2 T0 3 P.M. TO 4 L. 3 w York Federation of Churches Chicago: Concert, vocal and. instrumental - Cchimes concert - Vocal and instrumental recii music. S wQJ WSAT WPG from St James" S 2008 3804 5354 3612 5 TO ¢ P.M. 5:00—Louisville Plitaburgh Kansas ity P Dramatic sopra st Band' 0 soloist 6:00—Kansas City: International Su New, Yorlc Emie Gulien's He maun Theater Concert ¥ York: Nathan Abas Hotel F 6:20—New, York: Musical proxram by Ma) Gang"direct. from C: WO WWJ. WCAP and 09.8 091 ch Of Christ, Scientist, services ago: Organ recital: Valo : 6:45—Cincinnati: Songs and s Church 6:50—Atlantic City WLS. Little Brown Church in’ the vocal and instrumental program, Pittabureh York: Vocal Presbyterian Chu all “scores ball scores 7:45—Dave ort’ Base 7130—New York: B York: Base r program, WIP, WMAF ‘an piscopal” Church services ... v and_instrumental program: solof First Presbyterian Church services . ti: Pirs h services . 8 TO 9 PO 8:00—New York: Brooklyn New York: Vocal a stein Trie - New York: Lake Farm Tnn Atlantie City - Se: Tri Chicago: Ralph voral New York: Asbury Park Sym City: Hotel - Ambas Vocal and ‘inst Musical program I instrumental ental Minne. 8:30—Cinein Concert - Des Moines: Bankers' Life’ Trio ark Strand Theater program .. Concert WNYC program: solos; Bern- semble, WGY ‘and Rainbo Gardens Orchesira’ stra program: organ Second Church of Christ 9 TO 10 P.M. Instrumenta Godirey Ludlow, E. Church services . eningHour ed quartet solos violinist a1 bells news, WGY ‘and . and ‘the ‘Wiedman “vocal and ipstrumental solos: reading 10 TO 11 P Italian melodies: 1 and ather: score apel service Theater orga Sport review: M Musical program 10:15—Atlantic City 10:30—Hot Springs Davennort it Jack’ Davia. piani = 1 P 11:00—Hot_Springs Ray Cincinnati So successful has been the perform- ance of the 13 United States Light House Service radio fog signal sta- tions that 15 more are now being con- structed or equipped with this means of aiding navigation, while approxi mately 20 others are proposed. Within a few months the service will have 17 radio tube beacons in operation along the shores of this country. The new points to be pro- tected by automatic radio fog signals, which enable navigators to avoid coastal dangers and locate their po- sitions definitely, include seven sta- tions on the Great Lakes, one at Port- land, Me.; two in the Gulf, five on the Pacific coast and one in Alaska. The old spark transmitter on the Nan- tucket Shoals Lightship will be re- placed with a tube transmiter and the operating periods of several stations lengthened. Of the 13 radio fog sig- nals in operation, two have tube sets. The first was installed on the Am- brose Channel Lightship, WWAT, which is also equipped for regular radio communication when necessary the .other ‘is' the Lake Huron Light- ship. The -plan for having auxiliary radio - apparatus for communicating with_vessels is, also carried out on other lightships or will be soon. The ‘British’ Hner Majestic always uses the fog signals of Nantucket o0als Lightship regularly. This light- ship, knowh as WWAH, sends’ out radio and submarine sound signals imultaneously, which enable the nav- igators of vessels to determine their distances from the lightship as well as their dfrections from it by radio compass. Although termed fog signals, the emanations from these beacons, all on 1,000 meters, are frequently sent in both’ good and bad weather. They have distinctive forms and operate on established schedules. WWAH at Nantucket, for example, sends out four dashes, repeating them for a minute, following which the transmit- ter is silent for a half minute. The blasts of the submarine sound signal are a little different, but in each rep- etition of the characteristic signals the first dash of the radio signal and the first blast of the submarine sig- nal are sounded simultaneously. > The difference in time in seconds between the reception on a ship of the radio dash and the sound blast mul- tiplled by 1,600 gives the-distance in vards the vessel is from the flagship. The ship’s radio” officer, who listens in, is equipped with a special pair of head phones, one ear plece of which is connected with the radio receiver, the other to the sound receiver, So that he can count the seconds between the receipt of the two distinctive sig nals. As the sound signal travels less rapidly than the radio signal, there is always a lag of several seconds, de- pendent upon the distance; each sec. ond indicates a distance of 1,600 yards.” J The new tube transmitters, rated at 500 watts, like many o four broad- casting stations, have two 250-watt power tubes. Every part of the radio equipment is duplicated. The wave length of the beacon service is 1,000 meters. When these sets are installed on lightships or in lighthouses where regular radio communication is be- lleved desirable, one of the transmit- ters is equipped with a wave chang- ing switch, permitting operation on 600 meters, the marine calling and distress wave length, and also on 731 meters. There are in operation today 80 vessels of the service equipped for radio communication, of course carry- ing radio operators. This number in- cludes 26 light vessels, the balance be- ing sea-going tenders and relief light- ships. Many of the masters on the lightships and in_ shore lighthouses have bullt or purchased radio receiv- ing sets on which they listen in reg- | ularly, chiefly for recreation, as regu- lar Governmert and commercial radio stations along the coasts listen in for distress calls from ships at sea. The receiving equipment has proven val- uable in some emergencies, however, and the use of these sets is encour- aged. The Great Lakes stations under con- struction are Devil's Island, Manitou instrumental program concert solos ... solos recital . B r Davis' Orchestra Symphony . TO 12 MIDNIGHT. Mullins and his dance orchestra. Marion McKay and his orchestra. ... .. KTHS WKRC Light, Whitefish Point Light, Detour Light, Detroit River Light and Buf- falo Light. In the Gulf stations at Galveston and South Pass Jetty, at the mouth of the Mississippi, are be- ing equipped with radio beacons. On the Pacific radio is being placed in lightships and houses at Los Angeles Light. ~Point Arguello Light, Point Sur Light, Cape Blanco Light and Gray's Harbor Light. Cape Spencer Light, Alaska, is also to have a radio fog_signal Eighteen more radio fog signal sta- tions are proposed; four on the lakes, eight on the Atlantic, three on the Pacific Coast, and also three in Alaska. With the 13 in operation and the 16 new stations under con- struction, there will be a radio bea- con service along the coasts of the country at 47 stations, which will practically guarantee safe navigation for the radio-equipped mariner. Compared to the protection guaran- teed to the owners of vessels, the ini- tial cost of equipping a ship for re- ceiving this service, approximating $2,500, is very small indeed. It is said that the value of a great ocean liner, together with its cargo, is around $7,500,000, which shows the ratio of equipment cost to vessel value. About 95 per cent of the millions of prop- erty lost at sea annually is due to accidents in foggy weather. The fog signal system now protecting the coast of this country, with proper co- operation on the part of owners and masters of vessels, should eliminate practically all these losses. To protect the smaller craft, in- cluding fishing vessels and pleasure vachts, a new and less expensive radio compass has been developed to cost but little more than a good radio broadcast -receiver, “Radio Girls” Making Good. First we had the telegraph men, then the telephone girl, but now it's the radio girl. Perhaps it is the re- sult of a sort of electrical evolution. Surpassing their fathers, who click- ed out dots and dashes over the tele- graph wire, and their mothers, who handled telephone switchboards, girls today are broadcasting, managing broadcast stations, teaching com- munication through the air and even manufacturing radio apparatus. Wielding _electricians’ tools as adroitly as they might use knitting needles, hundreds of girls still in their teens are working in the great Atwater Kent factory at Philadelphia. Every radio set made there.is put together by girls, its colls wound and its dials painted by feminine fingers. |' These “girl Edisons” perform some tasks that literally are hair-raising. Those who operate polishing lathes, for instance, have their bobbed tresses pulled as erect as porcupine quills by the electric energy or static which the power belts create. Since they are not near enough the belts to be in danger many seem to relish the experience of having thelr hair stand on end, claiming it is equal to an electrical treatment. These modern radio girls are mak- ing sood in every line of the radio “game” they have entered, their su. pervisors report. Urges Fans to Know Sets. The radio fan's inability to operate his own set properly lies back of a large percentage of the interference complaints filed with the Government and reported in the press, in the opinion of Charles J. Jones of Nash- ville, Tenn. This fan proposes a new slogan, “Know Your Set,” which he suggests to the Department of Com- merce should be adopted by the radic world at large. Starting at home, as he should, Mr. Jones says he can read his set just reason he has little difficulty in re. ception. Jones has received stations from 217 to 545 meters and can go below and above. He believes that most people make a mistake in leav- ing their sets idle during the Sum- mer on account of static, which he insists is not half as bad as many be- as he does his watch, ‘and for shis’ EIGHT NEW STATIONS "IN THE RADIO FIELD Among Those Licensed, Three Are Designated as Particularly In- teresting Newcomers. Of eight new broadcasting stations licensed by the Department of Com- merce last week, three are particu- larly interesting newcomers. They are KFXF, to be operated by the Pikes Peak Broadcasting Co. at Colorado Springs: WBZA, a 250-watt transmitter, established in the Hotel Brunswick, Boston, by the Westing- house company, and WAPI, to be operated by the Alabama Polytechnic | Institute, at Auburn, Ala. The Pikes Peak station, situated at a greater distance above sea level than perhaps any other broadcasting station in the country, is in the na- ture of an experiment, and it is be- lieved that its location may enable it to become one of the best known voices in the United States. The plant will operate as a class A sta- tion, on 250 meters, using 500 watts of power. WBZA, which may become known as the baby WBZ, also will be used for some experimentation by the Westinghouse company. It will operate under a class A license on 242 meters, using 250 watts. The new Auburn station has been as- signed the 248-meter wave length and licensed to operate with 500 watts. In addition to being used in connec- tion with the engineering courses at the Alabama school, regular enter- tainment features by the students will be broadcas The five other new stations, all of them admitted with class A licenses, are K of Waterloo, lowa, 236 meters, 10 watts; KFXB, Big Bear Lake, Calif, 2026 meters, 10 watts WKBK, New York City, 209.7 meters, 500 watts: KFXC, Santa Maria, Calif, 209.7 met. 100 watt and K D, Logan, Utah, 205.4 meters, 10 watts. The licensing of the New York station gives Manhattan & new wave band and incidentally its lowest— 209.7 meters. The operation of the new plant, even in the heart of New York, is not expected to cause any more interference than is already be- ing encountered in the metropol Only one transfer of license was recorded during the week by the De- partment, a class B license being given to WENR, owned by the All- American Radio Corporation of Chi- cago. In being admitted to the higher class WENR has increased its power from 100 to 1,000 watts and will oper- ate on the class A wave length of 266 meters. Four increases of power among the super-power stations also were re- corded during the week. WOK, at Homewood, 111, recently given a class B license, has jumped its output to 5,000 watts, as has also WHO, at Des Moines. WEAF, of the American Telephone & Telegraph Co., New York, has taken another B00-watts step, which now gives it a rating of 4,500 watts, and WGY has added another step, bringing its normal power to 3,000 watts. Local Radio Entertainment Sunday, September 6, 1925 NAA—Naval Radio Station, Radio, Va. (434.5 Meters) 10:05 a.m. and 10:35 p.m.—Weather reports. WCAP—Chesapeake & Potomac Tele- phone Co. (468.5 Meters). 11 am.—Service at ,Reformation Lutheran Church of Washington. Rev. John Weidley, pastor, will preach the sermon. 4 p.m.—Service held at the Peace Cross, Washington Cathedral. Canon k of Washington Cathedral will 1 the sermon. 6:20 to 8:15 p.m.—Musical program By Maj. Edward Bowes and the “Capitol Gang” direct from the Capi- tol Theater, New York City. The first part of the program will be taken direct from the stage of the theater and will consist of music by the fea- tured artists and the Capitol Grand Orchestra. The second part of the program will consist of a special pres- entation by Maj. Bowes of vocal and instrumental artists direct from the studio in the theater. To WEAF, WEEL, WJAR, WCTS, WWJ and WCAE., 815 to 9:15 No Early WRC—Radio Corporation of America. (468.5 Meters) g.m.—Stud!e program. rogram Tomorrow. Silent. Early Program Tomorrow. 9:10 a.m.—Play-by-play account of the Washington-Philadelphia base ball game. 155 p.m.—Second game. BASE BALL GOES ON AIR. WRC to Broadcast Games Played by Washington on Trip. The final series of base ball games to be played by the Washington world champions away from home will be broadcast, play by play, by WRC, September 30 and October 1, 2 and 3. These games will be played with the Boston Red Sox at Fenway, Park, Boston. Since the opening of the base ball season in the Spring, WRC has broadcast similar accounts of all of the games of the Washington team on its road trips. Inee oot 0 “Radio Tour” Is Ending. The radio tourists, who are taking a trip around the world with stations WRC and WJZ of the-Radio Corpo- ration of America, are nearing the last lap of their globe-encircling trip. On Tuesday evening, September 22, the musical travelogue arranged by Thomas Cook & Sons will take the listeners on brief visits to Yokohama, Toklo and Nikko. —_— e Organists to Appear. Among_the organists who will ap- pear on WRC's noon programs during the week, beginning September 21, are Gertrude Smallwood, Charlotte Klein, Malton Boyce, George F. Ross and Adolf Torovsky. These recitals are daily features of the radio enter- tainment provided by WRC, and are played on the organ at the First Con- gregational Church. S S Y Union Miners Arrested. HENRYETTA, Okla., September 5 (#).—Seven union miners were ar- resteéd here yesterday by county offi- cers and taken by automobile to Ok- mulgee. County seat. No untoward event has occurred here recently, and the basis of the arrests was not known. lieve, if they would only buck it. His own set, which employs a detector and two stages of audio, has only been idle seven nights since last Oc- tober, he reports. On the whole, he believes this has actually been a radio Summer, his regeption has been so good. . v oiy > ne of the jmportant: pojnts to in- sure good reception, Jones ‘says, is a good ground. He now uses four grounds, and with the installation of each additional pipe in the earth he improved his reception. Two-thirds of the reported interference he be- lieves is due to poor operation by set owners. g John Smith and His Radio BY FREDERICK C. RUSSELL Car owners throughout the world have fellowed John Smith in his datly ‘motoring—and have benefited theveby. and is willing_that his fellow fans. should be amused and. profit by Ma Smith has a faculty for “finding out things” so it will pay radio devotees to follow him in The Sunday Star each week- evening experiences. No. 31.—Tips From a Local. A new local station can be a help or a hindrance, just as you prefer. Smith learned this in a rather con vincing way ‘the other night. “This' new station is a fine pest he complatfied, fiddling with the dj impatiently. “I can't seem to hold a thing tonight and I get mighty little. ‘With this business on the air I'll not be ablerto have an evening's com- tort k. “Why don’t you tune in on the local " station and .find out what's wrong with the others?” I suggested. Smith was puzzled, but he followed the suggestion, nevertheless. Within a few minutes he had discovered that the ‘local station was coming rather poori “Somethink's wrong with the set,” he concluded. “Everything comes in poorly.” ‘Something's wrong with the at mosphere,” I suggested. “I tuned in just befora T came over. My get works just the same way." Smith-had learned this with the ald of the local station, but the following evening he was to pick up a few more tips. He determined upon a defimite course of procedure, tuned in for the local station and sat back and observed, In the midst of ‘a concert the ether was silent. Not a sound came from the speaker and Smith rushed to the set o see what was wrong. “Don’t bother your head about that,” I said. “IU's a new station The generators are new, too. They've probably had to stop them a moment to_cool off.” Hardly were the words out when the concert came through again just as splendidly as before the break. “That’s a new one on me,” Smith admitted. “Why only the other night 1 had a new station about 1,000 miles away. The same thing must have happened. All at once it faded out, but, of course, I didn’t wait for it to come back. 1 just assumed that it was either trouble in my set or some freak of nature.” Close attention to the local station was beginning to produce results. One of the things Smith noticed in par ticular was the time consumed in announcements and the nu r minutes that were blank. These rep- resented delays in announcing, delays in starting numbers and delays due to smoothing out the difficulties of sta- tions operating through what is known as remote control, where the current is boosted by motor truck equipment in order to be sent o the wires from a hotel, concert hall or church to the broadcasting sta. tion. in | FIFTEEN MINUTES O PH CALCATERRA, Noted Authority on Radio. Reproduction Prohibited All Rights Reserved THE _INDUCTAN COIL—THE OUL OF THE RADIO CIRCUIT. PART IIIL We have so far taken up three methods by which the tuning char- acteristics of a coil can be varied. One makes use a slider contact arrangement, another makes use of a tap system using tap or inductant arrangement, another makes use of a tap system using tap or inductance switches, while the third makes use of a variable condenser connected either in series or in parallel with the coil. Another method of changing the Inductance in a circuit makes use of two colls connected in series and mounted so that one coil can rotate inside of the other. When the turns of wire in one are in the same di- rection as the turns of wire other coil the inductance effect additive, or, in other words, one aids the other, and the total ductance is greater than the ductance of either coil. When of the coils is rotated so that the direction of the winding of one coil is no longer the same as that of the other coil a_counter effect is produced which gradually increases and can reach a point where it neutralizes the inductance of the first coil and reduces the inductance of the coil arrange- ment to a minimum. Variometer Explained. The instrument which accomplishes this effect is called a ‘“variometer.” By its use the inductance of such an instrument and consequently of the circuit in which it is connected can be varied continuously from the minimum to the maximum value, or vice versa. The variometer does for inductance what the condenser does a of is coil in. in- one in the| | is increased or 1925—PART T Now he has taken up radio, mith could readily apprecfate that a fan 500 miles away might be tuning for the particular station only to hit it during the blank periods and be- come discouraged. He could see what a mistake he had made by continually fishing around for distant stations in- stead of giving each one a fair trial’ Another thing was the Inexeprience of the artists and the inability. of the studio director and announcer to get them to. register fop best results. One woman vocalist apparently was. t00 near the micrephone when reach- ing the high notes. A lecturer, from the. reception, must have heen talking down toward his notes instead of out to his audience. This made it appear s’ though the radio waves were fad- ing or were gubjected, to strange in- terference, but Smith was close enough to the situation to recognize the variation as of ‘human origin. He thought more of: his set, and also made up his mind to have more con- slderation for those who are engaged in entertaining and instructing him, Local Program Engrosses. So many of these points came to light that . before Smith’ realized it the local station had run through two straight hours of entertainment. “I guess. we've had enough of this," he suddenly announced. : “Besides, the station seems to be getting poorer.” Why not tune it over again,” I suggested.” “Don’t you know that a set has a’ tendency to detune itself while it's operating. - With some sets that operate only on the most critical ljustment you must keep at the dials all the time.” Smith picked up the evening paper, observed that at 10 o'clock the local station was scheduled for jazz, al- though it was still sending through ic aria. Te off their schedule,” he informedsme. othing unusual in that” I re “How are they going to cut off a fine bit of singing like this just because they're running a little be- hind time? Smith was suddenly elated. *“Why,” he exclaimed, “I never thought of that. Many a time I've tuned in for WFAR and thought I was getting something else just because the pro gram I heard at the moment was not scheduled.” things m cause it 3 happen to a station to to get oft its schedule.” 2z had started and the fam s begging Smith to help arrange the room for a dance. Next_week, No. Wave Traps (Copyright, 19 “Function of by The Ullman Feature Service.) F RADIO EACH DAY provides a finely luated means of varying the in ance characteristic of a circuit. The next method of varying the inductance characteristic of a circuit or coil makes use of the change in coupling hetween two coils connected in two different circuits. As the coupling between two coils made closer the s tem of two coils approaches the con. dition of two conductively coupled cirquits_using a single coil begween them. Experimenters who have used inductively coupled tuners or trans. formers have found that as the: wried the coupling between two i ductively coupled coils it became nec: for them to also vary the capacity of the variable condense which tuned either or both coils. The reason for this was due to the fact that the variation of coupling changed the inductance characteristics of the cuits and it was necessary to | make up for it by changing the ca- pacity values of the circuits in order to make up for the change In induc- tance. Variable Condenser Used. It is also possible to affect the con- stants of one circuit by connecting a_variable condenser across a coil and placing the coil in inductive re- lationship with the cofl which is con- nected in the radio eircuit which it is desired to affect. A careful study of practically all receiving circuits will reveal some form or other of the methods men- tioned in this serfes has been used to obtain the combinations which give such remarkable results in ef-| ficiency. These circuits will be analyzed in a forthcoming series of articles on tuners and radio frequency trans- formers and coupling devices. SPECIAL RADIO PROGRAM IS SCHEDULED BY WGBS World’s Fair Celebrities to Have Broadcast Prominence, Week Beginning September 14. Every afterncon during the week commencing Monday, September 14, except Saturday, WGBS will broadcast special half hour programs from the second annual Radio World Fair to be staged in the Kingsbridge Armory. These are to commence at 2:30 daily and many of the regular WGBS broad- casters as well as many other celeb- rities are to be heard from. A few of those to participate are Vaughn de Leath, “The Original Radio Cirl”; Jack Cohen, famous jazz pianist; Alice Brady, stage star; the Blossom Heath Serenaders, Strand Roof Orchestra and others. AGITATORS.ARRESTED. Seventy-Eight Alleged Plotters Against Latvia Held by Police. RIGA, Latvia, September 5 (#).— Seventy-eight agitators who, accord- ing to the Latvian political police, have been operating under the direc- tion of Moscow with the aim of over- throwing the Latvian government, have been arrested in Riga and the provinces. The Latvian police said that seven leaders among the agitators had false passports. The police announce that instruction from the Third Interna- tionale were found .on some of the prisoners, including plans for dis- Dbanding the Latvian army, the lqui- dation of private property and the arming _of revolutionary workmen during the forthcoming parliamentary elections. NOTICE TO SUBSCRIBERS . To avoid omission in receiv- \ing. The Star when. changing address give at least two days’ advance notice. Always give old address as well as the new address. BASE BALL, PLAY BY PLAY. WRC to Broadcast Washington- Philadelphia Game Monday. WRC will resume the play-by-play accounts of the base ball games played by the world champions when th take their final stand against Philadelphia in the Quaker City on Monday. Both games of the Labor day double-header will be given to ‘Washington listenersdn in detail. Special arrangements have been made to include in the story of the game all of the interesting events in the field and In the grandstand. The morning game will begin at 9:10 o’clock and the afternoon contest expected to get under way at 1:355 o’clock. e All horizontal aerials have a didec- tive tendency and the lead-in should be brought in from the direction re- ceiving most. FEATURING ATWATER-KENT RADIO ROBINSON’S MUSIC STORE, Inc. 1306_G St Main_2231-5934 Radio fiequM_Opmfin( I . Mary Texarina“ Loonis Just .0t the Press Price, $3.50 . The standard .radio text book of several of he leading colleges, techni. i o ndlo Tpediviche of United. States Gaverntrient. For_sale locally b{ Ballentyne & Bons, 1409 F. 5 A Bchiller’s D. Chritiani Co., Dupont Circle. Morrisow’s, 1009 Pa. Ave. Yaristy Book hon, 110 ¥, H. A French Co., 424 Oth. Chas. E. Richards, 1225 Pa. Ave, Elac st "fm%":‘i'm ar Radlo. 5e’s, 718 13th. Published by Loomis Publishinig Company 405 9th St. Main 7839 youthquickiytrade for | ?S’mdebaker Y Dulat-iijh Finich | RADIO’S BEST OFFERINGS TONIGHT. Musical - program by Maj. Edward Bowes and the “Capi- tol Gang,” direct from Capitol Theater, New York GCity, WCAP, WEAF, WEEIL WJAR, ‘WCTS, WWJ and WCAE, 6:20 to 8:15 o'clock. Program from Atlantic City Steel "Pjer, WIP, WMAF and ‘WGBS, 7 o'clock. Musical program from Brook- Iyn ‘Mark Strand Theater, WNYC, 8 o'clock, Bankers’ Life . Trio, WHO, 8:30 to 9:30 o'clock. Marion McKay and his ors chestra, WKRC, 11 o'clock. ‘PAN-AMERICAN AFFAIRS IN BROADCAST PROGRAM First of Series Will Be Presented by RRC October 1—Speakers of ' Prominence Listed. The first of & serfes of. pan-Ameri- canl programs to be broadeast by Sta- tion WRC at Washington this Fall and Winter will be presented October 1, under. the auspices of the Pan- Anierican Union, The speakers for the first of these performances will be Gen. James G. Harbord, president of ‘the Radio Cor- poration of America, and Dr. Leo S. Rowe, director general of the Pan- American Unlon. An elaborate musical program has been arranged to inau- gurate the new series of Latin Ameri- can nights, which will be featured by music by the United States Army Band, directed by Capt. Willlam J. Stannard; a double saxophone sextet of the Army Band, and a group of Washington’s most’ prominent vocal and instrumental soloists. The solo- ists include Grace Washburn, colo- ratura soprano; Helen Corbin Heinl, planist; Fred East, baritone, and Henr{ Sokoloff and Jose de Huarte, violin- ists. All of the music to be played in connection with the program will be by Latin American composers pro- vided for this event by Franklin Adams, counselor of the Pan-Ameri can Union. The entertainment will be broadcast jointly with WRC by Station WJZ, New York, direct from the courtyard of the Pan-American Building. U. S. Experts to Explore Peten. SAN SALVADOR, September 5 (®). —Advices from Guatemala say that a contract has been signed by the Gua- temalan government and the Carnegie Institute for archeological explora- tion in Peten, a department in north- ern Guatemala. This territory once was the seat of Itza Indian. Crew of Lost Ship Saved. HOBART, TASMANIA, September 5 (®).—The entire crew of the Karamu of the Union Steamship Co. of New Zealand, which foundered yesterday, was saved, it was learned today. A wireless message from another vessel vesterday said 11 of the men were missing. Agll“lNG TO HUMANITY ~ Toror sk S oRe THROAT uo TONSILITIS “kecps the tonsils healthy” 35¢ bottie At All Drug Stores MADE IN WHERLING W.VA THE TONSILO COMPANY N POLITICS AND THEATERS AGAIN T0 BE BROADCAST Critics on Each Topic to Resumc Talks Week Beginning September: 21. Two of WRC's popular talkers and critics—one of politics and the other of the theater—will resume thei broadeasting activities the week o September 21. These speakers n# Frederic William Wile, whose week! comments on “The Political Situatio in Washington Tonight” were ide discussed last year, and Leonard Ha! the flery dramatic critic. Mr. Wile returned to Washingto the first of September, after an ex tended tour of the West, and his opening radio talk will deal princ pally with the political situation-as he found it in the Middle and far West ern States. Until Congress opens fir December, Mr. Wile's talks will be given semimonthly and after the convening of Congress he will ‘take the air every week to discuss the po litical situation as he finds it on-the evening of his address. Mr. Hail, who vacated the talerd phone during the Summer months will return to the air simultaneously with the opening of the theatrical season in the Capital, and his weekly talks will be devoted to eriticisms and discussions of the current plays on Washington's rialto. An anti-slicing golf club has been perfected by a Boston man. BumsteadsthnSymn “To children an angel of mercy.” When d rections are followed IT NEVER FAILS. Despite scarcity and enormous cost of BAN- TONIN, it contains full dose. Stood sixty years' test. Sold everywhere, or by mail, 50¢ a bottle. School-time is the time to advertise The question of where to go to school— whether it's the pre- paratory or the real advanced courses — will be up for final decision in every family now— and the school and col- lege announcements in The Star will be closely read. The one way to reach practically everybody in Washington is through The Star. Call Main 5000— Branch 115, for information con- cerning educa- tional advertising. ZX5X FRXEXEXEREXEREXEX TN AR AR AR LTI ET TN — HeXZXEX All pups and most older dogs bave worms. lower the dog’s vitality Mdmh‘::hy.-’- other diseases. Keep your perfectly safe and certain, ey i Dy e ot i i oh Foarsvete effective medicines for all T e Avics Beretts smewers any question about your dog’s health without charge. - State symptoms, age and breed whea writing. Sergeant’ Drug Co, Inc. 1306 E. 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