Evening Star Newspaper, October 4, 1925, Page 35

WRELESSBEACON BOON T0 AVITORS Light Signals Enable Flyers to Detect Slight Variations From True Course. BY CARL H. BUTMAN. A_speclal type of radio receiver, which permits air pilots to maintain course through darkness and fog toward a radio beacon is the latest development in radio and aeronautics. ‘This improved radio receivy or indi- cator is visual, in that the pilot does not have to listen in continually for ihe code signals which keep him on | lis route; he merely watches three | electric lights on his dashborad. I'hey are operated by the radio signal vicked up when his receiver is prop erly tuned on the beacon, and ind cates to him whether he is on his vroper course or veering to the right or left. Radio beacon finding, or directional flying, tests have been conducted for ~ome time at McCook Field, in Day- ton, the pilots using the radio beacon t Wilbur Wright Field, which sends out a series of gwiding signals for their use. The development of this stem, patterned somewhat after the marine methods, has been through the co-operation of the ignal Corps and Air Service t MeCook Field and the Air Mail Service. In the te ., pilots frequently flew from the, field and lost themselves in the air, trusting to the radio b gnide them home. In this the always succes v System Used. The origina stem was called the ignal system, in which two sig- nals transmitted simultaneously from the beacon had to be kept at equal strength to assure the pilot that he was on the proper line or fying to- ward the beacon. development 1ade during the past year is an im svement. It is known as the inter- king signal system. Two distinct cnals are still ent out but they combine to form a third character when the airplane is on the right ne. If the aviator goes to the left e course he hears only one sig. se letter A" code. When he is off the to the richt he hears the or (—.) in code. iy on the preseribed course, these two-letter signals com- Line to form a continuous repetition © the code letter “T", or a series of | dashes. Hearing the serfes of dashes | continually, he Is sure his route is | toward the beacon, but when this serfes break up, he is either to the| right or left and must change his course until he again picks up the continuous signals Visual Indicator Used. The difficulty found with this | method in flying toward a beacon was the constant attention required by the | pilot. who has several other things to | do when flying his plane. Dependance | upon his ears required. 1oo.great con- | centration, increasing the chance of errors. To correct this difficulty and make it easier for the pilots, the visual indicator was devised. Three small electric lights mounted | on the instrument board in front of | the flyer, when properly connected ! with his special receiver. flash and £0 out depending upon his course. The unbroken serles of “T" signals, or dashes, which is picked up by the set when two signals are received with equal intensity, operates a relay which causes a white light to fl: This is the proper course light, constant flashing of which shows the | pilot that he is flying toward his | beacon. When the plane is off the | route to the left, a red light flashes: when on the rizht, the zreen lamp The port and starboard sig- | s used at sea are followed in fly- | r f i h. | he | lio beacon of this type is | now being erected at Mommouth, Iil., under the supervision of the McCook Iield radio experts \When completed | s beacon will be a valuable guide o the Air Mail pilots, and to Arn\_\‘t Airway flvers making night trips or in had or foggy weather, provided their planes are equipped with the neces. sary apparatus for following the bea cons’ guiding signals. banquet of the 1 Association the Hotel Pennsylvania in ) v York Frio: night will be st by WRD Speeches will be made by | Maj. Gen. Mason M. Patrick, chief of | ihe Army Air Service: Rear Admiral William A. Moffet, chief of the Naval Bureau of Aeronautics, and Comdr. John Rodgers, hero of the flight of the PN 9 No. ‘There is no varistion in ampli- fication over the entire range of mu- sl frequencies with Thordarsan Auto- formers. No note 1s too low —no note is too | high tobefully amplified by the Autoformer. | {Unconditionally Guaranteed RDARSON' DUN Trade-Mers Registeres Kll Frequengy Amplifier Introduces Four Great Improve- | ments in Amplification: Full amplification of those bass notes hitherto largely “lost” Greater clarity on all signals Improved reception of distant programs Better volume control ‘Thislatest Thordarson development —the Autoformer—utilizes for the benefit of your radio set the same principle used in the line amplitiers adopted by the more recent ligh- powered broadcasting stations. The excellent tone quality of these sta- tions—due to perfect amplification —offers proof of Autoformer effec- tiveness. W:iteforhook-upbulletin. Autoformer amplification is for those who seek the finest rep oduction of programs to bensd May be used with any set in place r sudio transformer hook-up. Full ons, with di: ams, su, pli with «each instrument. Auto.ormiers are § esch. @vid by the leeding des'ers THORDARSON ELECTRIC MFG. CO. OHIOAQO | been THE SUNDAY STAR, WASHINGTON, RADIO MAY REST THIS WINTER TO CATCH UP WITH OWN GROWTH Breathing Spell Needed to Put Business on Healthier Basis and Solve Some of Problems Which Have Been Inevitable With Rapid Development. BY ROBERT MACK. By Consolidated Prees. Four vears of development with a speed and intensity unprecedented in the history of industry have entitled radio to a season in which to pause and catch its breath. From all ap- pearances that privilege will be ac- cepted this Winter. “or four years the bars have been | down. Radio—which has come 1o mean the wirele: human_and mecl has there will cpnvene in Washington the fourth annual radio conference, called by the Government and attended by representatives of every element of radio broadcasting. Secretary Hoover will present a picture of the present problems of the afr and broadcasting and ask what's to be done. Then will come the task of declding, after all, what must be done. What about limiting the number of stations to be licensed by the Govern- ment? What about the present sys- - -has | tem of ilcensing? Should the Govern- liowed to follow its inclinations nent require a statfon to be bullt be- almost as freely @ gutter DUD.|fore it can formally apply for a license Sxcept for the ery onopoly, which {or should ft change its policy and issue ay not be true. but which | instead permits to build? What about always be expected to|superpower? Does it cause interfer- arise in connection with important | 2 ence or not? Do we want it or not? and valuable patent rights, there have | What about altering the broadeasting been few rictions on what radio Do, ’ RADIO GOSSIP AND NEWS ‘ Radio reception in some localities is seriously disturbed by interference arising from electrical apparatus in the vicinity. The only. general rem- edy for electrical interference is co- operative effort on the part of users of radio and owners of the electrical sources of disturbance to reduce or eliminate the causes of the trouble, the Bureau of Standards points out. Much of the work in reducing eleg- trical interference also results in an improvement in the operation- of the electrical devices or supply lines, and is thus a double gain. There are, however, ~some electrical devices which, even when in perfect working order, cause disturbances resulting in interference with radio reception. But in many cases it is possible to provide filters, shields, chokes, et the source of disturbance or at the receiving set, which do much to re- lieve the difficulties. Some of the disturbances from clec- trical devices are practically inevi- table and must be regarded, like at- mospheric disturbances, as part of the inherent limitation of radio reception. A frequent cause of Interference is the presence of alternating current power lines near the antenna or re- , either at | j around a receiving set having a series antenna condenser by connecting be- tween the antenna and ground termi- nals of the set a high resistance, which will offer lower impedance to the audio frequency than will the re- ceiving set itself. Sparks are produced in the normal operation of many types of electrical apparatus such as motors, doorbells, buzzers, gasoline engines, X-ray ap- paratus, violet-ray machines, some forms of battery chargers, rural tele- phone ringers, heating-pad thermo- stats. They are also sometimes. pr duced at defective insulators, tran formers, etc., of electric wire lines. Sparks ‘usuaily give rise to electric waves, which travel along the electric power wires and by them are radlated out and are picked up by receiving sets. The noise thus produced in' a radio set may come from a disturbance which has traveled several miles along the electric power wires. One remedy for such types of inter- ference is to eliminate the spark. This is possible if the spark is an electrical leak and not necessary to the opera- tion of the machine in which it occurs. Many very udeful electrical machines, however, require for their operation might not do and almost no limitations on the extent to which it might de- velop. Fortunately, behind radio were the vision and fmagination of some rare and unusual men. Ideas bred ideas in an instant and there was the faith ! to see them through. Approaches to Maturity. The result has been that Imost incredibly short time sed through adolescence and ap- proaches something like maturity. The success of its progress is attested n volumes of statistic: Department of Comm loud speaker in living room. There has been some bunk, many extravagant claims, bit on the whole radio has grown up gracefully. That it should pause to reflect and consider the permanent place it is to take in the life of the world is not taken to mean that development will even momentarily cease. But rather that where in the past it alw: ran, for & while, at least, it will now proceed more deliberately. The industry itself—the ture of radio transmitting and receiv ing apparatus—is flourishing, but there are weeds that have grown up in the business that must be pulled. There hasn't been time to do this in le and bustle of the past four in lio has nearly every one's manufac- . transmitted | ¥ Will Stabilize Distribution. That the business gardening job will be attended to this Winter is fore cast in the plans being made by nearly all of the leading radio manufacturer: to stabilize the distribution of their products and to eliminate those deal- ers whose sales methods have been questionable. Stocks of old models of apparatus are reported to be fairly well liquidated, and there is little pos sibility that the “‘radio rush™ of past vears, when set sellers appeared over- night, three or four to the city block, will ever be repeated. The sellers who were content to follow sound busines: methods are doing nicely Those who let the boom go to their heads have also quit by order of the hankruptcy courts, : In the radio factcries engineers will devote their time to perfecting. beau- tifying and otherwise improving the | nstrument of today. world radio dealers w number, In the retail I be fewer in their establishments more complete and in a healthier business | it is | atmosphere, and their profits believed, sure and steady. As in the development of the automobile indus- try, there will grow up the filling tions of radio, with their lines of tubes. batteries, wires, insulators and what-nots, Inventors StiH Busy. Inventors can be expected to con- tinue to dream and work for radio and keep the patent inspectos in Wasl ington busy. As to their discoverin; or inventing anvthing startling, it would tak. whale of a theory or product to surprise the thrill-fed world of radio. In the realm of broadeasting—and it is there that radio really comes home to the average citizen—the pause™for breath is perhaps be desired than in the fz the sales office. For four vears the air has been as free as—well, as free as air. And as a consequence, it stands now in danger of losing its freedom for the same reason that one can't eat one's jam and have i In the course of the next few weeks ctory or in Experts in radio acoustics, since 1908 L 7RI S22 2 e ‘WEGOLESALE DISTRIBUTOR Southern Automobile Supply Co. ‘1519 L St. N.W. Main 3564 LU IIRIII 1112771772 . an | on file at the | ce and by the | more to | witve bands, enlarging them or chang- ing -them? ' What about obtaining legislation to cover the whole subject? What about the suggestion that a commission be appointed to control radio? What about the amateurs? ! And who, by the way, is to pay for broadcasting? Free of Taxation. To attempt to answer any of the questions in advance of the confer | ence would bLe either to violate confi- | dence in revealing offictal opinlons al- ready formed or else to hazard pure and simple guesses. One thing is certain, There will be no change present system of listeners being free of any governmental taxation for the privilege of hearing whatever is on the air. In the past most of these problems have not been serfous enough to call {a halt on the laissez-faire policy that | has oeen followed in regard to radio. That they are now Important enough to make some action necessary is the bellef of Government officlals. | Congress, too, has intimated that it | will have considerable to. talk over however. from the |about radio and radio broadcasting | this Winter, and there is the oft-con- | tinued hearing of the alleged radio trust which probably wlil get under way before the snow flies or shortly after it has flown, | ., Some time in the Spring it is hoped | that not only the United States will have formed fairly detinite opinions as to what to do with rado, but that jall the important countrifes of the world will have come to a mutual un- | derstanding on the subject and will have laid down agreements and rules for broadcasting and other forms of wireless communication < verformed internationally. No Let-Up on Air. While conferences, meetings and hearings are being conducted this Winter it is not to be understood that the air will suffer any let-up in | the quantity of programs that are transmitted either for altruistic er commercial purposes. There are approximately 600 broad- casting stations on many wave lengths and of greatly VAarying power. If anything, the quantity of their pro- gram material will be inereased, and, from present indications, the quality jwill be generally improved. By way of novelty and of pointing out the eventuul possibilities of international broadcasting there will be frequent exchanges of American, British and German concerts and important ad- dresse: tennae of the Radio Corporation of America, the British Broadeasting Co. and the German government. And there is a distinct trend in the offices of program managers to de- velop their own radio presentations instead of using the stoc vpes o programs that came into existence when KDKA submitted its first regu- lar “schedule” to the press for pub- lication—a. form of schedule that has Yot b Team Seies, Entirty noisclonnsit ceats used while the set is in operation. If lhnb!fllzlhfluldhh',mmfdv (\lmcmmc and operate the set. rate 28 amperes. - Price $19,50 ite *B” Replaces “B" bat- Balkite “B” Replaces | ies uniform plate current from the light socket. With ita use your “B" carrent supply is always exactly what is re- Guired. Has no bulbs. Fite any set fequiring ot more thar 20 milliam- Deres at 90 volts—practically all sets of 5 tubes or less, and most 6 tube sets. Fits in your present dry cell Balkite "B” I Thestee populer lust year. Samtulm above, will fit any set including Price $55 nmnlmnvadmu rebroadcast through the an- | the making and breaking of electrical | circults while they are carrying cur- rent, and whenever this happens a spark is produced. It is impossible to eliminate these machines, so it is nec- essary to make the spark of such na- ture or o arrange the circuits that the radio-frequency current is reduced or iprevented from radiating. To prevent the radio-frequency cur- rent produced by a spark from getting lon to the lines connecting the sparking \pparatus some form of filter circuit is necessary. A condenser (1 microfarad, more or lass) connected across the | sparking points will short-circuit a | considerable amount of the radio-fre- quency current, or a condenser con- | nected from each side of the line to ground will serve the same purpose. A choke coil in each side of the line, in addition to the condensers connected to ground, forms a simple filter circuit which should prevent frequencles in the broadcast range from getting on the line. A high inductance (choke coil) or high resistance connected in Better Programs Likely. | each side of the line changes the char- 5 & 3 “teristics of the circuit so as to re- The chalns of broadcasting stations, | Guce the amount of power radiated. If inaugurated by the American Tele | such u filter circuit is not effective or phone and Teiegraph Co., can be ex- is impractical, the apparatus may in el ] Iole thit | thoroughly grounded. The screen duced into broadcasting this Winter. | ;’Jffif"‘” completelySaunountiitte ang A Dot ofsahe bl shIens IR ELES L e TaEhe ener who was contented to 1 * ; ace b e > source of interference trouble is 1o aaything on the air simply because he | FoNTee, of "I:.‘:rf: e b i Souldnt get over tho novel experfence | fng Lot Iratir. The gt thise te 13 of knowing that it actually was on | .15 St itself. L - Sy G | open the electric swi._a at the house same patlence and delight. ceiving set. Low frequency voltage (usually 60 cycles) are induced and the resultant current flowing in the receiving circuit causes a “humming” sound in the telephone receivers. A method of eliminating, or at least duclng, this interference is to plac the antenna as far as possible from the lines and at right angles to them. When the interference cannot be eliminated by such means, the choic of u receiving set may help. An in- ductively coupled (two-clrcuit) re ceiving set may help. An inductively coupled (two 1it) receiving set is less susceptible to such interfe enc than a single-circuit set. The use of one or more si adio-frequenc: amplification should also help to filter out the audio-frequency interference. It has been suggested that audio-fre- quency interference might be shunted lived up to the present with only a limited number of changes. the | : 5 g | meter; i : oise Insteaq | Meter: if the interfering noise is stil - stead | heard in the radio set, the source is he o= thelraan ace for phat it | then known to be outside the house. tereat or Bore: He Nooko ot ‘h‘;'v‘m"; | It is then desirable to report the situa- [grams and if there is something he | 107 10 the electric power et i o e Istena It hers 5 71 stror b el it noae LoL Holowing | _This knowledge is stimulating pro- | P ¢omPplaints of this kind. |gram managers, and thought and| guiy One S er” Stati | study can be expected to be given i apethower tation, | to_the psycholosy of hroadcasting in:| OMclals of the Department of Com- stead of merely to the task of filling | merce point ouwt that the word “super- up ;he;llullrd ume of the station | power” is being misused as a descrip- 0"_1_‘ e alr. ) tive term for many regular high-pow- here are other angles ered broade There is but one that will pause for owe horized; vear while they continue their de e e o et that g velopment. There are the radio | station employs 30 KWs on t- movies—rradlo vision.” as Dr. C.|urday and Sunday nights only, broad. Francis Jenkins, their inventor, terms | casting at other times on 3.500 watts them. What's to be done with them 5 KWs, it and how shall they be fitted into | Ithough ‘there are reports that a the present scheme of broadcasting, | Westingbouse and a Radio Corpora- or_will they? { tion station will seek authority to use There are polyphase waves. 50 KWs or more, no actual applica. they secrets of fading? tions have yet reached the Commerce And there is statlc, alway officials. 2 the one great obstacle to a The other B stations on the air, | system of broadcasting. It will at- | 500 watts or more, include 59 st tract the attention of many scientific | of higher power. s minds. How to get rid of it will be | station is KDKA. licensed to use as the haunting dream of getrich-quick { high as 10 KWs experinmntally inventors and some may get rich even | Then come the 10 5.000-watt statlons—— though they mnever learn the real | 1. WLW, WOC. Weco, WCBD, ecret. | WORD, KOA, WOK, WhHO Surely radio deserves a litile time | WEAF. Stations WTA in which to catch up with its own with 0 watts each, while | development. < rach using of radio | reflection this ! all tions The next strongest W Wi U.S PAT. MAY 27,1914 i ence OCTOBER 4, 1925—PART 1. are next in line. bined stations, \WJR-WCX, employ 2,500 watts. There are three stations with 1,600 watts, 25 using 1,000 and 7 broadcasting with 750 watts. But these are all high-powered stations— not superpower stations, the depart- ment insists. Ships Removed From Broadcasting Band. The actual strength of the broad- casting industry is indicated through the recent action of the United States, British and Canadlan governments in ordering all their vessels to keep off the broadcasting waves when within 250 miles of the shores of these coun- tries. Fans here and abroad will re- jolce, but the old marine radio opera- tors will certainly be astounded. Considering that the ships were the first to employ radio as a practical means of communication, and that they always have been considered first relative to the best channels for com munication, this decision reveals the trend of power toward broadcasting and its satisfactor: eption. The ships, however, are provided for in that they will continue to use the old distress call wave length- that is, 600 meters—and some chan nels above, far enough from the broadcast band as not to cause inter ference even when used neur the shores. According to statements issued by the State and Commerce Departments, commencing October 1 all ships fly ing the United States, British, Irish or Capadian flags are probibited from using the 300 and 450 meter wave lengths when within 250 miles of the shores of the three countries. A similar arrangement made early | this year between Canada and the | States relative to the abandoning of | these ship channels on the Great | Lakes. | Tt is expected,” the statement points out, “that this arrangement | will aid materfally in preventing in-| terference with the reception of pro grams offered by broadeasting st | tions in the United State Recep- | tion by fans in the other signatory | nations will also he benefited, of course. A few rs ago, however, 10 one would ventured to predict that any other use of these marine wave lengths would ever be made. However. there iy mutual benefit to be derived from the new agreement. since the ships themselves will now be free from broadcast interference. Third “Point of Progress” Planned. “The Declaration of Independence,” the third of a series of “Points Progress,” sponsored by L. E. Wat man Cc will be present Wedn. day at 9 p.m. from WEAF and nine | other stations (WOO, WUAP, W WCAE. WJAR, WEEL WWJ, Wt and WCCO), In “The Declaration of the events leading writing and signing of this s0 important to every Ame zen, will be described in ‘The musical program will typlcal American songs. 3 characteristic American style. will provide the atmosphere so help ful in “putting over” the talk These new series have met Rreat respons from the radio & dience due to the unusualness of the program, consisting of an accom: ing half hour of music.of the period | described, and of a scholarly talk de. livered in an interesting and convine ing manner by C. H. Fuller on some great personage or institution in the | world's histor of 1 AT Independ up to the cument. with A general reconditio) Radiotron UV-201-A, standard high- vacuum tube for storage battery scts. Charges both 4 and 6-volt radio “A” batteries at about .5 am- peres. Especially adapted to use with sets of small “A” current requirements. May be used in 3 ways: 1. With a low-capacity battery of the type leading manu- facturers are offering this fall for sets now using dry cells. Makes possible a most economical installation. 2. With a regular storage battery for sets of few e bat- tery tubes. Furnishes more current than is used by 6 dry cell or 2 storage battery tubes, so that if used while the set is in op- eration it need be used at no other time. 3. As a “trickle” or continuous charger for sets of as many as 8 dry cell or storage battery tubes. Manufacturers are.offering special switches which turn off the charger and turn on Bal- kite “B” when you turn on your set. This makes your current supply for both “A” and “B” circuits automatic in operation. The Balkite Trickle Charger is 53 in. long, 23 in. wide, S in. high—fits in your dry cell compartment. Operates from 110-120 AC 60 cycle current. Special model for 50 cycles. Noiseless—No bulbs— Permanent Like all other Balkite Radio Power Units the Balkite Trickle Charger is entirely noiseless in operation, and is a permanent piece of equipment, with no bulbs or moving parts, and noth- ing to replace, break or get out of order. Balkite Radio Power Units provide uniform constant current for both*A”and “B™ circuits. Whatever type of set you own Balkite Radio Power Units will serve it. Sold by leading radio dealers everywhere. Mansfactured by FANSTEEL PRODUCTS COMPANY, Inc. North Chicago, Illinois Balkite Radio PowerUnits SALKITE TRICKLR CHARGER + BALKITR BALKITE *3" Be sure they are genuine Radiotrons: Uv-199 8250 UX-199 $250 UX-120 $2.50 UV-201-A $2.50 UX-201-A $2.50 -200 UX-213 $7.00 UX-216-B $7.50 A“UX or WX tubc isthe same as the corresponding “UV" or “WD" tube, except in the * design of the base, RCA- MADE V777 Lobk Schwartz 708 7th Street NORTHWEST transmitter at station WRC is being conducted by Walter L. Tesch, engi- neer in charge of the Radio Corpora- tion's Capital station, in preparation for the coming Winter. Considerabie work on the transmit- ter was done during the Summer by Mr. Tesch, with the result that WRC's programs are now being heard over much greater distances generally than heretofore. Although licensed to operate with one kilowatt of power, the WRC transmitter {8 still running at its power rating assigned at the opening of the station a little more than two years ago. The best distance record made by this station during the Summer was approximately 1,600 miles, which rec- ord was made in the day time, when an afternoon program was heard in southern Texas. UNITED DYE'S INCOME. NEW YORK, October 3 (#).—Net income of United Dye Wood Corpora- tion, a holding company, for the first half of 1925, was $23: . after charges and tax ubsidiaries had net income of $137, 35 FIFTEEN 2,000,000-SHARE DAYS SO FAR THIS YEAR NEW YORK, October 3 (#)—Many other standard industrial shares par- ticipated during the week in the up- ward movement under the leadership of U. S. Steel, but the week was noteworthy, mainly for the broaden- ing of buying interest. Dally trans- actions twice exceeded 2,000,000 shares, bringing the total number of 2,000,000-share days so far this year to 15. - WOOL MARKET STRONG. Special Dispatch to The Star. BOSTON, Octover 3.—The wool market closed the week strong with dealers today very firm in their de mands. Their attitude was strength | ened by news of the volume in which | offerings were being taken in the Lon | don market. 3 zrades h quots e week wit 1ts apo e staple ter nged wed slight v ! tions current earlier in Ohio quarterbreds at 6 | and half blougs at 53. ritory clean Boston $1.27 to $1.30. BY THE M I i\ N MO'I;HER! Fletcher’s Castoria is a pleasant, harmless sub- stitute for Castor Oil, Paregoric, Teething Drops and Soothing Syrups, prepared for Infants in arms and Children all ages. It has been in use for more than 30 years to safely relieve Constipation ~ Wind Colic ~ To Sweeten Stomach Flatulence Diarrhea Regulate Bowels n the assimilation of Food. promoting Cheerfulness, Rest ar Natural Sleep without Opiates @ ALLL, id imitations always look for the signature of T Proven directions P TO a few years ago, a MazDa lamp, with a vacuum one mil- lionth of the density of air, was con- sidered a remarkable achiévement. But that wouldn’t do for Radiotrons. A way had to be found—and it was foundin the laboratories contributing to RCA—to exhaust the tube to ten million times less air than in a lamp! Even the metal and the glass itself have been forced to give up air bub- bles hidden inside their very substance. And no one even knew before, that metal and glass held hidden air bub- bles. : If the air isn’t all out—the electrons that carry the radiosignals can’t jump across as they should. The tube wouldn’t last' long—it would usc more current and do less work. That is why this new perfected serics of exhausts makes the RCA Radiotron 50 remarkable. And the series of in- genious tests during and after exhaust- ing, insures that every RCA Radio- tron is exhaustedtothe fullest possible degree. To be sure of getting fullest service out of fyour set, you must get the most completely exhausted tubes. The one way is to find the RCA mark on every vacuum tube you buy. RADIO CORPORATION OF AMERICA CHICAGO NEW YORK SAN FRANCISCO L Radiotro AKERS OF RADIOLAS for the Home of Perfect Diamonds A\, ARIDNZ. 3123 M Street GEORGETOWN