Evening Star Newspaper, November 15, 1925, Page 49

ATWATER KENT RADIO SETS Installed in your home on approvar HARRY C. GROVE, Inc. o o S Aristocrat Tube Socket Aristocrat Rheostat The choice of the big majority of leading set manufacturers. Write for folder of complete line. For sale by leading dealers. The Kurz-Kasch Company | Here's a new Audio Transformer that ““lets through” the deep and the high tones. Tts perfect amplification of the overtones makes for mellow- riess and reality. Brandes Experts in radio acoustics since 1908 Write for dutoformer Hook-Up Bulletin Trode-Mor: Registered. All Frequency Amplifier It Gives You g Full amplification of those bass notes hitherto largely “lost” 2 Greater clarity on all notes 3 Improved reception of distant programs 4 Better volume control latest development of the world's o'dest and largest exclusive makers of transformers. For those who wish the finest reproduction of programs 10 be had. May be used with any set in place of regular audio hook-up. Autoformers are %5 each at dealers’. WORBARSON ELECTRIC MFG. CO., CHICAGO Largest Exciusive Moulders of Bakelite. | | | Dayton, Ohio i With the radio public, and, In fact, most of the radlo industry, desirous of weeding out a large number of the 571 broadcasters now licensed, the | Department of Commerce is seeing to it that every station licensed is actu- ally operating. Wave lengths not be- ing used regularly may be recalled and fssued to prospective stations awalting air channels. Some owners are apparently of the opinion that they can renew their broadcasting licenses once a month without keeping on the air. This is far from the fact. A license to oper- ate a broadcasting station is given with the understanding that the own- ers actually broadcast—at least once a week—and may be recalled if this requirement is not met. Just as with traction companies or public carriers, radio broadeasting, as a_public service, must function, or the charters will be revoked in broadeasting, a renewal of the license refused, Street cars must run over their rights-of-way to pre- | yerve their charters. Broadcasting channels must be used or they will be recalled and reissued to another company or individual desirous of giving something to the public. Radio inspectors in all nine districts are making a survey to see that thelr ! broadcasting stations are actually using thefr assligned wave lengths. Where any are found inoperative they are told to keep on the alr or signify their intentions of shutting down. So many stations have applications on file for air channels that this survey is necessary. Owners have been re ported who think they can close their “.\mlwnu for the Summer or Winter ! and oven up again when they so de- | sire—but if they do, they find they are without the necessary channels when they try to open up again. Just be cause there is a shortage in wave lengths, they cannot be held like so { much stock, but must be used in the public interest. Broadcasting licenses must, of course, be renewed each month or they lapse. It is hoped that, with the ac tion of the fourth radio conference and the radio legislation recommend- ed, that licenses may be issued for a much longer period, preferably a year. This would eliminate considerable work by the departmental official: The short period was established be- ause it was believed congressional | legislation would soon be forthcoming which would necessitate the renewing )€ all licenses, in which case a delay the expiration of licenses d | | | ! ! Mabel Garrison Sings Tonight. Mabel Garrison, America’s for most colorature soprano, and Dais Kennedy, violinist and wife of John Orinkwatef, creator of the popular Jlay, “Abraham Lincoln,” will divide honors in the seventh A. Atwater Kent radio concert, broadcast from WCAP and 12 connected stations tonight at 1 9:15. o'clock. | ""Miss Garrison is a native of Balti- | more and a graduate of the Peabody | Institute of that city, one of two grad- uated with a vocal diploma. Like sev- eral other notable singers, she start- ed out to become a concert pianist, but later gave up the piano for singing. Beginning her career in church work, she gradually took up the con- cert until Gatti-Casazza saw her pos- sibilities and acquired her services for the Metropolitan Opera. where she was soon the chief colorature soprano, successor to Chrisine Nillson. Nellie Melba and Marcella Sembrich. like most singers, she never s abroad, though she has sung in opera in Buropean capitals and the_ Orient. Her husband, George Siemonn, was tormerly teacher of plano at Peabody Institute, and now plays her song ac- companiments. Miss Kennedy is a most popular radio artist in England, having the | distinction of being the’ first of the {Queen’s Hall instrumentalists to broadcast in England, where she has played more than 50 radio concerts. She also has the distinction of being | one of the first of five feature enter- tainers selected by popular vote for the great “request” night given a short time ago in London. Born in Australia, Miss Kennedy's { first musical instruction was received in Adelaide, South Australia, after which she traveled to Prague, where she studied with Prof. Soveik for four years. She made her debut in Vienna in 1911, and in the same year ap- | peared for the first time in Queen’s | Hall, London. This was followed by | debuts in Paris, Berlin and other varts of Europ including a tour | through Great Britain, Ireland and Australia. Her first appearance in America was “In three most success- | ful recitals in Aeolian Hall, New i York, five years ago. | i Radio Assumes Important Role. Radlo has for some years aided the development of _international com- merce, protected its shipping and served as an almost instantaneous means of private communication, but of late it has assumed a new role carrying news and events through international broadcasting. Many of ur larger broadlasters are being heard abroad, especially tothe Bast wnd South, with regularity, so that mportant speeches of officials and | savants are carrying our policles and doctrines overseas; our musicians, rtists and our orchestras are heard in foreign lands; the procecdings of most important’ national functions and events, together with news items, go far and wide through the aid of radio. All of which makes for a closer contact with our neighbors and a bet- ter Mnderstanding of our aims and ideals. Similarly, a number of power- ful foreign stations are heard by American_ fans. The growing intimacy and respect bhetween the United States and Argen- tina is said by Dr. Julius Klein, di- rector of the Bureau of I'oreign and Domestic Commerce, to be due largely to the expanslon of our radio and | cable services and the resulting im- | provement in the news services be- tween these nations. This statement also undoubtedly applies . to every country in touch through our radio | | circuits and our privately operated | radio_broadcasters, especially Mexico and Canada, where American stations | | are perhaps as popular as the home stations. | One of the large outstanding fea- | | tures in national developments during | the past fiscal year was the continued | | expansion in the application of scien- { | tific discovery and research in the fleld of radio and other electrical lines, | | according to an economic review of | | the year by tie Department of Com- | merce. | | 3 | Notes of the Stations. | Two new applications for class B/ | licenses have been received by the Department of Commerce, one from Oakland, Calif., and the other from Boise, Idaho. ! The First Presbyterian Church of | | Oakland, listed as KTAB, a class A | station, seeks power af 1,000 watts and | permission to uperate on 333.1 meters, | jor 900 kilocycles. This application | will be granted, it is believed. the use | of this channel being available on the | | Pacific coast only. | KFAU Is the new cali to be assigned | a new B broadcaster, under the title | of Independent School District of | | Boise, locaied at the Boise High School. * The power will be 750 watts | and the wave length 282.8 m., or 1,060 | kilocycles. The Oregon Agriculture College is | | expected to appl for permission to |operate a B station. dividing time | { with another class B broadcaster. The | definite wave lengths and power are | not announced. | Station KFPG, { Radio Corporation, call to KMTR. Harry F. Pa the K. is to change its v, Cedar Rapids, is SR ST R RADIO GOSSIP AND NEWS changing the call of his station from WKAA to KWCR. The call lettérs WIBQ have been reserved for a new station to be opened by Bucknell University at Lewisburg, Pa. Three stations have been authorized to increase their power: WEBH, Edge- water Beach Hotel, Chicago, will soon be using 1,500 watts; KGO, Oak- land, is going to 4,000 watts, and WLWL, Paulist Fathers, New York, plans to operate with 1,500 watts. BUILDING EXPANSION CAUSES CAUTION PLEA NEW YORK, .November 14 UP).— Fear that a danger point in bullding construction soon may be reached was expressed today by J. H. Tregoe, ex- ecutive manager of the National A soclation of Credit Men, in & state- ment appealing for prudence. He urged business men to “conserve and build safely for the future. Mr. Tregoe pointed out that with the possible exception of 1907, every major panic we have gone through in this country began with unhealthy and unwise real estate expansion. John Smith and His Radio BY FREDERIC! Car_owners throughout moloring—and i that his fellgw fans shoul experiences. Smith has a faculty radio devoiees to foliow him in TN No. 39: Potentiometer Pointers. If Smith learned nothing else from his study of the “C” battery as a means of grid biasing it was that no story is ever the whole story. He had learned the reason for the “C" battery nd yet when he went to examine the set that Smith, Junior, had bullt for himself no “C" battery could be found. “What_do vou do for biasing Smith asked his offspring. The boy, however, suddenly app ed stupid. He did not know what Smith was talking about. “Either somebody’s been telling me | 4 lot of unnecessary theory or I'm a few grades ahead of you, son, mith said. “I've been told that in using the vacuum tube as an amplifier it is necessary to keep the grid negative as a means of saving ‘B’ battery cur- rent and preventing a lot of distor tion. They call it biasing the grid Dby giving it a negative potential.” “Greek” to Boy. It was still Greek to the boy, Smith suggested that they see school teacher who had helped neighborhood boys build their sets. “I want to know how the boy's set operates a loudspeaker without biasing the grid as in my set and most of the others my friends have? asked. “The grid of the amplifier tube of this set is biased,” corrected the teach- er, “but possibly you are under the impression that biasing ix a matter to be handled exclusively by a ‘C.’ or &rid battery. We can do the biasing with the regular ource of current, provided we introduce a device known as a potentiomete Smith was genuinely relieved to find where this instrument fitted into the scheme of thin He had heard it mentioned ms imes. but failing to find one on his set had not found the proper opportunity to become ac. quainted with i A potentiometer, as the teacher ex plained. is very much like a rheostat Is a resistance formed by a small » arranged that a_sliding con- tact can be made to send the current through a iable amount of the colled wire. Smith recalled mn Ohms's law that varying the resist e has its effect on the voltage vallable for use after the current has flowed through the resistance unit. Obviously either the rheostat or potentiometer furnishes a handy way of dividing voltage. and their opera tion is so simple that one does not have to figure out the relations be. tween resistance, amperage and volt e while the instruments are being operated. certainty the fan knows that when the pointer. slide, at one end of the bwol circle of coil a maximum of volta, 50 the the 22-karat Fine Let we so the_world have followed John ave benefited thereby * Smith | K C. RUSSELL. in s dal radio, and. hia " evening will pay smith fie has taken u GontArttnes ot g o 1t 7 “ecfinding out. tAings.” 40 i sunday Scar each week. Now 1 will be available, while a minimum will be found available at the other | Differs From Rheostat. “Before T show you how the poten- tiometer can be useful for grid bias- | ing,” the teacher explained, “I want | vou to note that this instrument dif- | fers from a rheostat. If you examine t carefully, you will see that pro- | viston s made for connecting wires | to both ends of the circular windings, or coll, and also to the pointer, or slide. This is to provide a means of attaching one end of the circular coll to the positive terminal of the ‘A’ bat- tery and the other end to the negative side of the battery. The connection at the slide is then run to the grid.” Smith interrupted to ask whether the wire from the slide of the poten- tiometer went straight to the grid, and learned that the wire would be con. nected to the secondary post of the transformer opposite to that of the connection to the grid of the next amplifier tube. In other words, the potentiometer was connected to the grid in exactly the same fashlon as the negative post of a “C" battery would be. “Well, then, why not use ong of these potentiometers in all sets in- stead of a ‘C’ battery?” Smith asked. Bi g With “C” Battery. depended upon the voltage being used for amplification, the practical radiost told him. Voltages on the plate of over fifty encourage the grid to become less effectively negativ and in such cases biasing with a “C' battery becomes necessary. With volt- uges of fifty or lower the potentio- meter offers sufficient biasing. Obvi- ously this was the case with the boy’s “To It ssible confusion,” let me remind you have a resistance added the teac that a rheostat ma of 60 ohms or per s only vhereas the resistance of a_potentiometer used for biasing should be between 200 and 400 ohms. Maybe this little point will help you when you buy conden sers, transformers and other units which look alike on the outside but which may be so different that one will work in your hook-up while the other won't Smith no longer was puzzled about blasing. He was sure now that he was straight on the subject Next Week, No. 40: Caring for the Set. (Copyrikht &y the Ullman Feature Service.) . A scratchy rrosion at points of contact. frequently be ellminated by ning connections to storage bat us all be truly thankful, at this season, for the many blessings that seldom think of. Even people with bad tecth should be Gold Crown and Bridge Work. per tooth, $6 and 8. Guaranteed. the @ teeth ihe blessing of m wracticed by DR. expert, careful dentists, have good teeth. they ¢ DO YOU REALIZE WOW LITTLE IT COSTS for good efficient methods and large v practice keep prices down? Come let us tell you the charges for four years of honest, careful dentistry here, ntis Attendance 407—Seventh EXT TO thankful. DR. FREIOT Though unable to fully enjoy hanksgiving Dinner because of their they should remember that through dern dental science as FREIOT and staff of n - soon Hand-made Plates our » clalty, $10, $15, Other plates in num, siiver Inin.” Gunr: where ne of n and ving you GOOD TEETH. try r record. Twenty- Terms of Payment May Be Arranged 5t. NW.—407 KAS'S JEWFLRY STORI ess Ts One of Our Many Striking Features SPECTAL o charge for extracting w 9 AM. to 6 P.M. ATTENTION TO ~NERVOUS PEOPLE n other work is being dons Sundays: 10 AM to 1 P.M. Look for the Name DR. FREIOT and Address Be Sure You Get futo the SAY “BAYER ASPIRIN”- Richt Officc. Phone Muin 19 Lonuine When you see the “Bayer Cross” on tablets, you are getting the genuine, Bayer cians and proved safe by Colds Headache Pain Neuralgia Neuritis Toothache Aspirin prescribed by physi- millions over 25 years for Lumbago Rheumatism DOES NOT AFFECT THE HEART e Acccph jonly Bayer which contains proven directions, Hand; Also package “Bayer” boxes of 12 tablets. tles of 24 and lOD-—DruuhtI. Aspirin fs the trade mark of Bayer Manufaeture of Monoaceticacldester of Salteylicacid noise is sometimes due | It OVEMBER 1 FIFTEEN MINUTES OF RADIO EACH DAY BY JOSEPH CALCATERRA, Noted ‘Authority on Radio. All Rights Reserved. Reproduction Prohibitnd. How to Bulld a De Luxe Five-Tube Controllodyne Recelver—Part VL. The next wire runs from the negative (minus) terminal of socket 22 to the “A” terminal of rheostat 4. This wire should pass directly over hole “g. - The “D" terminal of jack 11 is connected with the wire just men- tioned by a wire which runs from the “D" terminal of jack 11 to a point directly above hold “g” and then through hole “g"” to make con- nection with the wire in question as it passes over hole “g.” The No. 2 terminal of voltmeter 3 is also connected with the wire which connects with terminal “A" of rheo- stat 4. Now run a wire from the “C" ter- minal of jack 11 through hole “v' to connect with the negative (minus) terminal of socket Next run a wire from the negative (minus) terminal of socket 20 to con- nect with terminal “B" of rheostat 5. This wire should be connected with the “A” terminal of condenser 27 through hole “y.” It should also be connected with the No. of_voltmeter 3. Now run a wire from the “A” ter- minal of condenser 7 toward the back of the subpanel to a point di-| rectly above hole through hole “I" to conn “D” terminal of radio frequeney transformer 18. The “A” terminal of grid condenser and leak 19 should be connected with this wire at a polnt near the “D" terminal of trans- former 18, Next make a similar connection be- tween the A’ terminal of condenser terminal of radio fre- and then t with the Join A S Aew PLAYER 3 terminal | 1925—PART 1 5 speaker plug, turn on the current and proceed to the business of tuning. The position of the fixed condénser 29 in the aerial circuit is controlled by | switch 30. The first step is to adjust | ;o the fllament voltage of the tubes.| o The best results are obtained wllh‘ a voltage of 4 on the radio fr | quency tubes, 3 on the detector and 5 on the audio freque: amplifier quency transformer 16 through hole | tubes. £10 0 (rauen i el he, “G” terminal of socket 17| Turning the knob of radiohm 2 in- should be connected with the “D'|creases the tendency of the tube to terminal of transtormer 15. oscillate and increases the volume tenhiihe same way connect the “A” | obtained. The rest of the tuning is yminal of condenser 12 with the|done with the three varable con Cranstonminal of Jradlo frequency |densers. Slight readjustment of the Higheformer 14 through hole “s.” The |rheostat and radiohm control will clear | derminal of socket 15 should be |up reception. | | ramested ith the “D” terminal of | The loudspeaker should be placed | transformer 14. e | on the left hand side of the receiver Now connect the “P" terminal of |or cabinet to avoid any whistles and | socket 17 with the “C" terminal of | distortion. Any distortion can be radio frequency transformer 1. | eliminated by proper adjustment of e senrec: (et terminal of |the detector and radio frequency | St troquenth the ~C terminal of | rheostats and the raiohm. Now run a wire from the “B" ter- minal of condenser 27 through hole | “m” and connecting in turn the “p” | terminal of socket 20 and the “B" terminal of audio -transformer 21. Then connect the *“B” terminal of crid condenser and leak 19 with the ' terminal of socket 20. Connect the “G" terminal of audio transformer 21 with the “G"” terminal of socket 22. Connect the “G' ter- minal of ‘audio transformer 24 with the “G” terminal of socket 2. Now run a wire from the No. terminal of voltmeter 3 to the “B' terminal of rheostat 1. The negative (minus) terminal of socket 15 should | De connected with the wire just men- tioned. His Only Order. From the London Opinion. “Yes, laddie, I was a commercial traveler once, but not a success, old not a success in the part, I was the road four weeks, and the only order 1 ever got was the one my firm telling me to come hom e Rough on Auntie. ~tom Life. ell, George, p to see T suppose you've the sights of New Auntie, and I thought I'd call on_vou first. STOMACH MISERY ad can | Chew a few Pleasant Tablets Instant Stomach Relief! Final Proof to Him. From the American Legion Weekly. Brown—Do you think the d communicate with u: Black—I know th managed to borrow a dollar from a | | Scotchman. A week later he dled, ar I haven't heard a word since. v can’t. Once T Not So Costly, But Better. From the Philadelphia Inquirer. “Your daughte; said M Olds castle, after being conducted throuz the newl; furnished wing of the mansion occupied by the Bullingtons “has such a splendid vocabulary " “Do you think 0" her hostess re plied. “Josiah wanted to get her one of them escritoires, but 1 made up ms mind that a vocabulary would look better in a room furnished like hers is, even If it didn't cost quite mich.” Wiring Completed. If you have followed each direction ynretully the wiring of your recelver is now completed. It is an easy matter to connect up the batteries, aerfal and ground cording to the connections shown on the wiring diagram, and operate tha recelver. Now The moment “Pape’s Diapepsin” reaches the stomach all distress goe Lumps of indigestion, gases, hear burn, sourness, fullness, flatulence, palpitation, vanish. Ease your stomach now! Correct digestion and acidity for a few cents. Druggists sell millions of packages. Slow adjustment of tuning dials is the only kind which brings in long distance stations. insert the tubes and loud- Ninth Consecutive Year—Nine Times Greater Than Ever rthur Jordan’s Christmas Piano Ciub (The Original Xmas Club) Piano IMMEDIATE DELIVERY on THIS BEAUTIFUL NEW PLAYER With its r.ich mahogany case and latest expression devices will add untold joy gmd happiness to your home. Just think of the fun you can have with the entire family gathered around- this dandy player singing the songs you love best or dancing to the latest fox trots and waltzes. You will not miss the easy Two-Dollar Club terms. Call and investigate immediately!