Evening Star Newspaper, June 13, 1922, Page 13

PO ' THE EVENING STAR, Genuine Victor Victrolas from $25 up DROOP’S “How can T get rid of mice quarters. Pie 5 of today’s Star, the Victor Co. advertises this won- derful instrument as an example of Victor leadership. Victor Supremacy MUSIC HOUSE Steinway Pianos, Player-Pianos—Everything Musical ¥ Mice and Rats people ask that question. BO-NO Lig BO-NO Liquid thoroughly in all holes in your clo: ever you kncw that rodents run or s will not die in the house but will leave immediately for other —again demonstrated in this splendid instrument. Thete are practically no limits to the Repertoire of Victor Records, and the owner of a Genuine Victrola may enjoy no ‘end of good music—oper- atic, standard, band, or- chestral and sacred music —faithfully rendered by, the Victor Records made by leading artists. 1300 G and rats?” Thousands of id is the answer. Spray ts, wher- s and mice Today use b iy SR ills R bedbugs, roaches g::';:‘s 222 h and other pests, Gallons ..$2.75 Woodway & Lotheop Housewares Section, Fifth floor. , RADIO RALF— OFF A BICYCLE BY RADIO TODAY of Radio Complete* Programs 50 meters. Deparfment. report for the Pennsylvania, West WWX—T 10 District « Kt O am.—W of nia and & I m.—Marketgram (fruit and ) on 1,100 1 ! wiher report. | | WM U—Doubleday-Hill L tric (’um-‘ i ¥ G0 Meters). | 430 to5en0 Iase ball scores : following program of musie | sopran (Wagner) )i S Cont Inc. 616 17th Street D. J. KAUFMAN 1005-07 Pa. Ave. We Give the Values and Get the Business WHO CARES? —how high the thermometer registers 1f he be clad in one of our zeph yr-weight GENUINE MOHAIR VESTLESS SUITS at the cooling price of We have about 500 of $17.25 these wonderful cool garments, in stripes, neat fancies and plain col- ors in shorts, longs, regular and stouts. Hand- tailoring that brings out a definite finish of style. Fine White Flannel Linen Golf Knickers W hite and Tan Khaki Trousers ... Striped Serge Trousers . . ... Gabardine, Crash and { For Outings, Shore or Club and 32 69 LEST -YOU $24.75 and $29.75 *20 FORGET! We are closing out several. hundred fine Woolen and Worsted Suits (broken lots only) of the season’s best two prices that compel your Even if you don’t need them mow, the suits will be useful in the fall. ; sellers at attention. $33.75 10 $40 SPRING SUITS SPRING SUITS 27 Money’s Worth or Money Back tenor and (Puceini); “Dancing Mari *“piano (Henry 11 My Life,” trot (Lee David); “Old Bla Joe,” piano (Foster) ro It Aguin.” | fox (Grorge Gershwin-Bud de ! ntralto (Mendels- piano | fate | (Charmbury) (Biese-C “Invitation to the Dance,” ver); “I'm | Just piano (Sis- Wild Abou | sel & Blake). | WPM—Thomas J. Willinms, Inc. (360 | Meters). 12:30 pm—News items; stolen automobil reports on | WJH—White & Boyer Company (360 ’ Meters. { 8 p.m-—Jessie Masters, assisted by Daniel Breeskin, violinist, and the Ampico reproducing pi “Danse Humoresque ved by Mischa Le- Miles), played by & Nouvelle” (Pol- Muriel Pollock; (Liszt). p Ch pring- ( | Ring” /(Chaminade), Master: | “Romanee,” Concerto, 2, in minor (Wienowski), “Serenad | (Drdla), “To a Wild Rose” (MacDow ell), Mr. Breeski >own in the For- ¢ 7 (Ronald), he Buttercup” “Pirate Dreams” a Happy | (Kuester), | ter), “Youth Has { (Lohr), “Ships That_ Pass in —GEE,~ T CAN GET A RADIO MESSAGE ANYTHING- METAL! -~ WHY, T CAN GET A MESSAGE RIGHT . | sets, sending or receiving. OR SQREEN - OR WASHINGTON, D. C., TUESDAY, JUNE 13, 1922. TLL BET You CANT GET A MESSAGE OFF MY WATCH CHAIN! EXPERT ADVICE ON RADIO No. 26.—House Lighting Currents for Radio. BY A. HYATT VERILL. Expert on Radlo Technology. One of the greatest objections to radio telephone sets of the vacuum tube type is the fact that batterles are necessary for their operation. Not only are batteries expensive, but they are heavy and cumbersome and require a great deal of attentlon. Dry batteries last a comparatively short time and storage batterles must be recharged from time to time. Moreover, the electrolyte, or acid with which they are fiiled, must be kept up, the acid is forever burning spots in garments or carpets and is a great nuisance. However, no other available source of current’ has been devised which will give as good re- sults and so, despite their objection- able festures, they still remain the standard. Very good results may be obtained by using the ordinary household lighting currents of 110-volt alternat- ing current, both for the current to| the fllament and to the plate of radio For send- | circult should be set near the center and adjusted until the hum is largeiy eliminated, and then, by adjusting the two, practically all of the ob- jectionable humming wlill be cut out. Of course, any form of induction for tunIng may be used, the one in the diagram being a tapped coil with five taps, but the same principles and Mook-up may be used with a vai coupler, variometers or any other type of tuning device. iTo Make Transformer. To make the transformer for the plate circuit you w quire a num- | ber of pieces of sh, cut in the form of ) luce a c . If you possess you may be able to cut yoursel?, but it is_better : = very litfle more to have them cut for you at the tinsmit Place the shee them £ iron together i and wrap e with smal sized strong twine around the end, so that the various pieces c slip. Then secure or make some | ight” (Stephenson), Miss Masters; ng of India” (Rimsky-Korsakoft), ansonetta” (Ambrosia), “Dear Old * (Ritz-Rice), Mr. Bree- ~ “Recessional” (be Koven), 2 5" (Grey), "My Laddie” (Thay- | er), “Happy Day,” ‘a spirituel (Pa- | renteau), “Homing” . (Del Ricgo), | Miss Masters. Hecht Company Meters). 3 to 4 p.m.—Music and features. | WEAS—The (360 3¥N—National Radio Institute (360 Meters). 6:30 to 7 p.m.—Radio spark code. WVP—United States Signal Corps, Bedloes Ixland. N. Y. (1,450 Meters Enstern Daylight-Saving Time— Deduct One Hour). 8:50 p.m.—Instruction in radio. 9 p.m.—Concert. 9:03 p.m.—News and sports. GY—General _Electric Company, chenectady, N. Y. (360 Meters— Eastern Standard Time). 0 p.m.—Early stock market ions. Produce and stock market base ball results; news | bulletins | 7:45 p.m.—Concert; special program i ca Quartet. 3 p.m—"Telephone Head Set Re- ceivers,” by A. Van Dyck. WGI—Amrad, Medford Hillside, Masx. | (360 Meters—Eastern Daylight- Saving Time—Deduct One Honur). 5 ews and music. ws and music. 5 p.m. Economics,” by Prof. Wooster of Tufts College. 8:30 to 9 p.m.—Continuous gram of music. pro- WWZ—Wanamnker's, New York city (360 Meters—Eastern Daylight- Saving Time—Deduct One Hour). { 1:15 to 2:15 p.m.—Music and chil- dren’s stories. 7:30 to 9 p.m.—Special program of music and children’s stories. | WWJ—Detroit News (Eastern Stand- ard Time). 9:30 a.m.—Tonight's dinner household hints (360 meters). 9:40 a.m.—Music (380 meters). 10:15 am—Weather report (485 meters). 11:55 a.m.—United States Naval Ob- servatory time signals relayed by telegraph (360 meters). 12:30 p.m.—Music (360 meters). 3)0 p.m.—Weather report (485 me- ters). 40 p.m.—Market quotations (360 meters). - p.m.—Complete sport world news (360 meters). 7 p.m.—Conce?t by Detroit News Orchestra; “The Town Crier”; Pauline McClellan, soprano; Edith ,Comisky, pianist; Edith M. Ruebekam, music lecturer; Detroit News Quartet; O. E. Vesselli, bass (360 meters). KDKA—Westinghouse, Eaat Pitts- burgh (360 Meters—Eastern Stan ard Time). 9 to 9:15 a.m.—Music. 11:30 a.m.-to noon—DMusic. 2:30 p.m.—Base bdll scores Py in- nings. s | 6 p.m.—Weekly dress talk; “Recent Developments in Cement,” by Col. H. C. Boyden of the Portland Cement As- sociatfon; base ball scores; theatrical features. 6:45 p.m.—Special news; govern- ment market reports; summary. of New York Stock Exchange; weather report. 7 p.m.—*“Do You Know Your Cost?” by James T. McLean, national director of the Industrial Cost Association; “Old Glory's Birthday—F1y Your Fla; and Put Your Heart Into and Behin 1t” by Willlam T. ‘Kerr, president American Flag Day Association; base ball scores. ; 7:30 to 8 p.m.—Bedtime and Uncle igglily stories for children. 8 p.m—Variety of vocal selections y_Emil C. Hennig, cellist; Helen and results; £ LEAD Acomuwva ing, the electric light current serves very well, but for receiving there is always a certain amount of humming when this source of current is em- ployed. Hum Is Negligible. When receiving with head tele- phones, or even with one step of amplification, this hum is negligible if the set is properly made and installed. Music and singing may even be brought in through two steps without the humming interfering to any great extent. As a rule, a single step is all that is recommended for sets using | the 110-volt current. By using Myers' bulbs, however, fairly loud sounds may be obtained with” a single-step amplifier, for the Myers' tubes possess the power of amplifications to a_very high degree and a detector and receiver equipped with them gives results almost as loud as a single-step amplifier with ordinary tubes. In order to install a set using alter- nating current the current must be transformed to direct current and must be divided into two distinct voltages, one of from forty to eighty volts for the plate, and the other, six volts for the fllament. In order to accomplish this, transformers and rectifiers are used. These may be purchased ready made, but it is not at all difficult to make them if you possess a little skill and patience. Although a_transformer may be con- structed which will step-down the 110-volt A. C. so that both the plate and filament current may be drawn from the same transformer, yet it is far easier and simpler to construct or purchase a transformer to trans- form the 110-volt current to the high voltage direct current for the plate and use a second transformer for the filament. If 2 single transformer is used for both cireuits it is a most difficult matter to eliminate a humming noise in the receivers. Ths may be so Te- duced by providing suitable instru- ments that it is scarcely noticeable when using head receivers or one step of amplification, but if two or more steps of amplification and a loud speaker are used ,the hum will also be magnified and will be a nuisance. Functions of Transformer. By using the separate transformers a great deal of this is avoided and, moreover, the construction of the set is far more simple. But, as some per- sons may wish to experiment or to use a single transformer for both circuits, ‘both systems will be de- scribed and illustrated. Figure 1 shows the circuit using two separate transformers, the filament transform- er, ‘A, being an ordinary bell-ringing transformer, which may be purchased ly from any electrical supply del . One end of the wire from the reduced current side of the trans- former is connected with the rheo- ;nd the other is led to the filament with & potentiometer of 1,000 ohms resistance shunted across the leads, P, and connected with the grid circuit wire at its center as shown. The other transformer, B, 18 a closed core transformer, made as cribed herewith and provided with recti- fiers, CC. The wires are led as shown, with a fixed condenser of 3 M. F. D. capacity shunted across and with potentiometer of 4,000 ohms in the lead to the phones on the plate cir- cuit, 8. These two potentiometers are most 1%1::1-1-1: for them de- waterproof paper. This may be good quality white paper soaked in shellac or melted paraffin. Wind eral sheets around the long (six-inch) sides of the core and wind on the primary wire. This should be of No. 22 double cotton covered or enameled copper wire, and_should have 225 turns on each side of the core as shown in figure 2. Place waterproofed paper over the windings and wind on the secondary. This should be of No. 30 wire wound | 164 turns on each side and with a tap taken at the 164th turn as illus- trated. May Use Fruit Jars. In order to smooth out the direct current from this transformer vou will require rectifiers C. C., which are simple and easy affairs to make. Ordinary fruit jars will.serve for the containers, and the number you re- quire depends upon the size of the jars and the capacity of the elec- trodes. Try at least four and add more if needed. The jars should be filled nearly full of a saturated solu- tion of borax and water. The borax should be mixed with hot water in some receptacle-and stirred until dis- solyed. Then continue adding borax until no more will be dissolved. Al- low the solution to settle, and pour the clear liquid into the rectifiers, being careful that there is no dirt, | ?edlmenl' or undissolved borax in the ars. The electrodes are strips of sheet lead and sheet aluminum about one- | Leighth of an inch thick and one-inch | wide. A sheet of lead and a sheet of aluminum are used in each jar and are connected alternately as shown. To secure the strips in position in the Jars, they may be merely bent over at the ends and hung on the edges of the jars with the wires screwed or soldered to them, Fig. 3-A. It is far better, however, and makes a neater job to have the plates attached to covers as shown in . 3-B. These covers need not fit the jars, but may be of wood fiber or hard rubber, cutl square and large enough to com-, pletly cover the tops. ' This prevents the borax solution from evaporating and avoids dust and foreign matter falling into the jars. It also gives a good support to the strips. These are merely bent at right angles near one end and are secured to the tops by binding screws such as may be ob- talned from old dry batteries. By placing the strips the right dis- tance apart they will bear against the sides of the jars and prevent the tops from sliding about. Before using these rectifiers, the plates must be “formed,” which is easily accomp- lished-by connecting them to an or- dinary lighting circuit and letting the current flow through for several hours. From time to time, the liquid should be replenished by adding pure water only and as the aluminum strips become thin and perforated they must be replaced with new ones. This is the only care or expense con- nected with the rectifiers after they are once made. The other set, in which a single transformer is useéd for both plate and fllament circuit, is practically identical to, Fig 4, ~aside from the transformer.” This is made exactly as described, except that a third or flla- ment winding must put_on. the short sides of the rectangular core using No. 18 wire and putting on twenty-six turng-divided between two . 5, and, of e, removin d using the Waterproofes the twine a; paper over theé core before winding. After the transformer is completed to wrap sides paper . 13 BY JACK WILSON Copyright, 1922, by The McClare Newspaper Syndicate. BUT 1T'S A HORSE HAR wATCH CHAIN HeH —HeH - HEH ! PICKUP A MESSAGE ¥ | FROM SHETLAND TSLANDS! IN'MODERN PULLMANS “FAST.STEEL TRAIN® f the / Daily from Chicago via Burlington Route-Great Northern Railway to St. Paul, Minneapolis, Glacier Park, Spokane, Seattle, Tacoma, Port- land, and stop off at Glacier National Park Vacations cost less this year—rates are lower—no war tax. 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