Evening Star Newspaper, May 18, 1922, Page 22

. BY A. HYATT VERRILL, Expert'on Radle Techneologf. Although many thousands of inex- perienced persons who know little or nothing of electricity or of the tech- nical side of radio are today using wireless_telephones, yet most people imagine that the instruments are complicated and. difficult to under- stand. Even though the instruments are ‘easy to use and no knowledge of electricity or wireless is' required in order to secure successful results, Jat Deople feel that in order'to per- form such a marvelous- feat as to bring in messages from the air, the apparatus in its little black case muet be cpmplicated and made up.of countiess = mystericus instruments which no layman could possibly un- derstand. 3 They know that by turning certain Kiiobs, dlals or handles they hear the songs. mutic and messages from -dis: tant stations; but beyond this évery- thing is &n unsolved. inexnlieah'~ mystery. How surprised they would Be if they were 10 lear apart ghe Vas: which contains this modern®miracie and found that it consisted of half a dczen simple instruments or less and a few wires! Indeed, the simrlicity of the radio telephone is really the most remark- able thing about it. -An _efficient erxstal receiving et may be made with but three instruments—the phones, or receivers; the detector, and the tuning coil (figure 1), while a vacuum tube receiving set does not necessarily contain more than five in- struments—the telephone receivers, vacuum tube, tuning coil, rheostat and condenser (figure 2). Omly Six Instruments. As two of these, the phones and tuning coil, are the same in both types of sets, there are but six dis- tinct instruments used in radio tele- phone receiving sets. Once the pri ciples and operation of these six ip- struments are mastered it Is easy to understand every form and type of set, no matter how large or compli- cated it may appear, for these six in- ‘struments with~variations, combina- tions and alterations are all that are used in radio telephonmes. The lay- man becomes confused and feels hopelessly lost when he hears or reads of vario-couplers, loose-coup- lers, Inductances, variometers, stat- BY RADIO TODAY NAA—Naval Radie Station, Radie, Va. 10:30 a.m.—Meteorological report on 5,950 meters of arc transmitter. 12 noon and 10 p.m.—Time signal, followed by weathér report and ship orders. o 10:30 p.m.—Naval press news. Wave length} 2,650 meters. ‘WWX—Post Ofice Department. 10 a.m—Weather report for the District of Columbia. Pennsylvania. Ohio, Maryland, Virginia and West Virginia. 10:30 a.m.—Marketgram (fruie and vegetables) on 1,100 meters. . 12:30, 2:15 and.3:30 p.m ‘marketgram telegrams on ters. 3 pyn.—Whol€sale dairy report on | 1,160 meters by radiophone. ' 7:30 and § p.m—Market report on 1,160 meters by radiophone. :50 p.m.—Weather Teport. ‘WMU—Doubleday-Hill Electric Com- pany (380 Meters). ! 4:20 p.m.—Base ball scores, inning :30 to —Base ball scores | announced. Mu: H of Paradise,” “Albumleaf, Aroof GirL" “After Rain, " “Eddie Leoni of lantation “Somewhere in SYN——Radlo Institute (360 Meters). - Expert Advice on o,'_ No. 4—Simplicity of Radio Sets. VARIAZLE ConOENSE) ors. rotbrs, varjable coils, induction colls, transformers, choke colls, etc. but each and ail of these are merely variations of the- same simple coil used in the cheapest crystal séts. It is the same way with variable con- densers, fixed ‘condensers, etc. While it is not at all necessary for the average person who uses a re- celving set to learn or understant the underlying _principles or the tech- nicalities of any or all of these in- struments, still it is a good plan to know what each does and why it is used In the set. The tuning coil, which may be of 1> oneof = doen diffsrent torms ncer as muny different namex, I3 used to tune the set or, in other words, synchronize the set with the waves from the particular . tation you wish to hear or, to put it anothes ‘way, to out out messages and wi you do not wish to hear. “Shortentng Aerial Wire.” The manner in- which this is ac- complished—no matter how or by what arrangement of sliders, switches of movable cofls It is done—is by lengthening or shortening the wave length of the recelving set, and, amounts to lengthening or shortening the aeriul wires. The delcctor or vacuum tube, “de- pending upcn whether the st i3 a crystal or a fube set, serves to re- duce the rapidity-of the wave vibra- tions by cutting them down and thus rendering it possible for the tele- phope receivers to reproduce the \, GR10 25p A CavoENSER sounds with vibrations low enough for the human ear to detect. The vacuum tube in addition serves to amplify or enlarge these vibra- tions and thus bring the sounds more loudly to the ear. ‘The telephone receivers serve to transform the electrical and sound- less vibrations of the waves to sound waves which are audible. The con- denser adds to the capacity of the set and the variable type allows this capacity to be varied at will to ald in tuning. while the grid-leak com- bined with the condenser in a tube set is to allow a ocertain portion of the negative current dn the tube-grid to “leak” or run back and thus prevent the tube from being “clogged.” , Phe rheostat is merely a simple forh ot coil by means of which the amount of current flobving to the fllament in the tube is controlled. - So. after all, the marvelous wire- less telephane is really a very sim- ple affair and there is nothing at all complicated or mysterious about ft. 5 p.m.—Base ball scores; program of music. 7 p.m. — “Jack Rabbit Stories,” iby m.—"“The Social Minutes of ." by Dr. Charles B. C health officer of Newark. N. J. i 745 pm—-Poland.” by A. N. New- rench. Foreign News C A:lbciaflcn. ‘orrespondents’ to 10:15 p.m.—Concert d direction of Charles D. Tsaacson ° KD KA — Westinghouss, Pittah: (360 Meters—Eastern St :‘r: 9 to 9:15 a.m.—Music. 30 to noon—Music. | p.m.—Results of all b sames by innings. league bu,} p.m.— 1 2 &, B;m—Base ball acores; theatrical! Overtur: 5 p.m.—Special, news; govern- Coggeshall: A DIRECT READING WAVE METER A wave meter is distinctly a val- uable addition to the apparatus of any radio experimenter. If It is properly equipped the wave meter can be used as a minlature sending station, whose wave length can be known. and is portable. strictly speaking, new, to some of the ne a buzzer. used as a miniature tra: ing very closely, justed, a 500- sists of three coll may be selected by variable air condens: posts are provided for c: the wave length r n; aken on a damped e quickly varied over a considerable|is desired. range. - Used in this manner in co nection with a receiving set, the re- ceiver can be accurately calibrated for a number of wave lengths an the necessary adjustments noted in 2 bodk, or sometimes marked on the receiver dials. There is no guessing both mech (Adams), Marjorie mental trio, “Medle; ‘Teran), Unique tone solo, ment market reports; summary of New York Stock Exchange; weather report. 7 p.m.— “Medicine,” by Dean R. R. Huggins. University of Pittsburgh; “Why Pittsburgh Needs a City Plan. | mi3ed ¢ by & member of the Junior Civie Veino, League. . %330 p.m.—Bedtime story for chil-|% dren. ., _+ 8 p.m.—Versatile entertainment by Mrs. Etta Cunningham, concert so- prano, and Fred Lots, concert pianist, and the saxophone trio. 9:55 to 10 p.m.— Arlington time signals. usical mixed soprano; ' (Tiiford), Harry ggie with violin obligato: Veino, soprano: address Wilson of the fede e vocational training; WGY—General Electrie Company, Seheneetady, N. V. (300 Meters— Enstern Standard Time). Lo & 2:30 p.m.—Stock quotations. p.m.—Stock quotations; base ball (Godard), : from “Jocely s fow'” (Del Acq Mixed Quarte! companied (Foster). p.m.—Piano _solo, “Lustspeil (Keller-Bella). Asa O reading, “Jimmie, ) VOIS e eTe > 6:30 to 7 p.m.—Radio spark code. WW3—Detroit News (Eastern Stand- " ard Time). a.m.Household hints to house- music, on 360 meters. 10:15 a.m—Weather report on 485 meters. "~ -11:556 a.m.—U. S. Naval Observatory, fl-‘ofln n 380 meters. 12:05 p.! -Music on 360 meters. 3:30 p.m.—Market quotations on 486 meters. 4:06 p.m.—Weather report on 435 meters. 5. p.m.—Complete sport results and ‘world news on 485 meters.- 7 p.m.—Program of music by Doris Stanley Perry, ten- °$ a.m.— Agricultural reports rices as released by New York, New ersey and federal bureaus. .10 a.m.—Program of music. 11 a.m.—Program of music. Noon—Agricultural reports: weath- cltoncu% program of musie. : p.m.—Weather forecast; program ot music. 2 p.m.—Shipping news; program of ‘music. p.m.—Base ball scores; of music. . 4 p.m.—Base ball.scores; of music. . and’ dependable. dealers, who i are anxious to give you good 2R Vv ST pressive collection of supplies. desires to build a cryst the more complicated market ‘will growth possible. " The manager and a technical graduate, .and the U. Huber’s expe M struction phases, but he has had'many months of radio sales has recently ‘visited thelar; ] - New York, Ne np Announce the Opening of Expert Radio Man in Charge -, 'a.&Supe\r tendent.of Operations_rin this city. gest 3 ewark, Philadelphia and Pittsburgh; as well as the engineering -branches of some of the best known radio fai and is, t i ‘=<pol_itmn s Desi wn, manu um:gr_s. and ls. .therefml'e, m _If-you are interested in Radio:in.any mianné hall deem it a pleasure tlo explain as ’_ymy 4 . NS———E, VI A N\ | W\ W | Y SToTe e are KA HRC o8 Lo X XX keeping with. the popular demand for the world’s greatest marvel and en- tertainer, Lansburgh & Brother will open a Radio Department. The Radio market cannot supply all the needs of the amateur radio fan, = due to the enormous demand, so we have spent two months assembling an im- reliable and well known radio sets, loud speakers and \ These supplies include the. necessary pa':ts~ for the youngest novice who tal detector set, or the advanced amateur who requires hook-ups. Jo~Laazh g SR LR Rcady Tomorrow, Fourth- Floor Annex ) - Lansburgh & Brother will strictly adhere to its traditional ing for sale only the most reliable merchandise obtainable, to our customers complete selections of desirable apparatus, in'so ‘far as the ermit, and o' render the same service ‘which has made our licy of offer- ll:ve ready for N bayer of the Radio Department is Mr. J. Fred Huber, who has had eighteen yéars of practical experience in the electrical field, having been associated with the Stromberg-Carlson Tel. Mig. Co. of Chicago and Rochester, the C. & P. Tel. Co. of Washington, D..C. . S..Government at the Panama Canal as General Foremangand later rience in. the Radio-field has not o e nly been in its con- jence.. He ty, Chicago, departmeént-stores. in Kansas . the Radio-Public demand: | x and desiré ini question that may confront’you., ; i lished . in_ Local Papers. - . w2 and ap audible resonance indication information.we ' ‘New Apparatus and Devices - 3. . \ ) YmamananarBy Ralph Brown, Ridio EngincersARAaaaaanasd as to what recelver adjustments are required for certain sending statio) whose transmitting wave lengtbs a The wave meter has numerous other uses and s particu- larly valuable when It reads d The wave meter fllustr: o:l R u some polnts that may be of Interest experimenters. Firstly, It is self-contained, with the necessary dry cell battery to operate The buszer provides the generating device when the meter is itter and produces a tone of pleasing pitch. when prop ycle spark trans The' oscillating circuit con- vided, so that the meter may in_determining the wave length of radiation from either a damped or continuous wave transmitter. A crys- tal detector and telephone binding in which is to be ‘Tyler; i “Little Mother of Mine (Burleigh), Mr. Charles Coggeshall; uartet, “Festival Te Deum in (Dudley Buck), Mrs. Charles L. Mead, J. L. Hultstrom, alto, and P. Cheney, duet, Sweetest Story Ever Told” (Stults), Mrs. Hultstrom, enntr-llo.blnd Mrs. Y- board for reading, Model Sermon” (Smith), }fiss Marjorie Tyler; instrumental trio, “The Trail (Holmes). - LANSBURGH & BROTHER Their ™ instru- ot Popular Aire” L. Uniqu: ‘Berceuse, T oy~ The Bw Cogmeshall; soprano solo, “The Swal - Mrs. N. M. Veino; ‘Old Virginia,” unac- = 78 | INDUCTIVELY CO! e ING CIRCUIT. 150 ectly ot, a8, ond circuit. cillation is the the oth ntrolling factors. circuit shown. & wave length range of [ be used itter The meter is very well gonstructed ically and ‘electricall: The panel is of bakedite, all me parts are well nickeled and the c rying case is of polished walnut.. A leather handle on the cover adds to the portability of the instrument. Grovas” the second oung, “The A “A A New O’Donnell’s Store at 723 14th St. We've bought out the store and stock at this address—formerly Simms’—and O'Don- mell prices are now available here as well as at> the other two steres. Moth " Balls Lb., 13c At All Three Of Our Fountains " Ice Cfeam Soda Egg Phosphate, 15¢ Milk Shake, 10c UPLED RECEIV- ‘When two separate circuits are placed near to each other and oscilla- tions are caused to flow in the first, oscillations will also flow in the sec- If the second circuit-is 50 adjusted that its frequency of os- me as that of the first, the oscillations will be of max- imum possible strength, depending on The two circuits could be so arranged that the magnetic fleM of the first coil cuts the turns of the second coil in the And in fhis case the coil in the antenna circuit must be 80 adjusted that the antenna circuit is in resonance with the oscHlations coming to it from the sending station. The second coil should then be ad- justed so that the secondary circuit formed by the second coil and the va- riable condenser is in resonance with the antenna circuit. Of course, both coil and the condenser bari- | could be adjusted to secure this. con- ditiom, and, in practice, both are used. It is'seen that in this case the detec- tor circoit is removed from the sec- N: M. |ondary and connected across (or in [WASHINGTON'S GREATEST DRUG | «|8 for ......... 8-ounce size, denser. The sec now oscillate freel: s materially decr: When the antef cillations tuning condenser. ner. wave length quency) of either. to each other, coupling, the; coupling reduced and loose coupling. 95¢c na (or RADIO, EXPLAINED INSTRUCTOR NEW YORK. Y.M.C.A. RADIO SCHOOL shunt to) the variable tuning con- y (alternating current) flow in the secondary circuit. If the secondary circuit is put in resonance these secondary oscillations will be of maximum strength. in the detector circuit is pulsating, due to the rectifying action of the de- tector, and is made to flow because of the voltages across tl The small fixed condenser in shunt to the head tele- phones is charged during each group of oscillations and discharges through the telephones in the customary man- Sometimes, but not always, the small fixed condenser may be done away with because the telephone re- celver cords provide some capacity (condenser effect) in shunt to the re- ceiver magnet windings. The coupling between the antenna and secondary circuits may be varied without very greatly changing oscilla: Close coupling is had when the two coils are very close for example, Whi one is all inside the other. is_loose energy drawn less rapidly from the antenna circuit by the secondary. fective resistances of both circuits is the tuning qualiti greatly improved. The signal strength might, however, be considerably de- creased, so that it is a case of which is more desirable, increased selectivity or increased sigmal strength. though, 604 9th St. F St. Corner 12th 723 14th St. MONEY-SAVING SPECIALS FOR TODAY, FRIDAY AND SATURDAY Capital Girl Hair Nets 10c, 3 for 25¢ 2 Lbs., 25¢| Dozen, Ivory Soap . 3 for 19¢ Wrisley’s Lemon' Soap 5¢ Cake Sulphur Candles 4-ounce size, each /....oioieinng 10c circult is tuned adlo waves oscilla- New Apparatus and Devices By Ralph Brown, Radio Enginee A STORAGE BATTERY FOR THE PLATE CIRCUFT- ‘Many radio experimenters and others who listen to the broadcasted concerts prefer a storage battery for jplete batteries when they run down The storage “B" battery deseribed is designed to require charg only about once in from four to i months. It will supply a con.pars tively heavy current upon deman and ‘is, therefore, suitable for with loud speakers. a lead-acid circuit may its resistance ‘A" batter), whose voltage, when fully charged, is %5 volts. Taps are provided to vary this voltage, w Lecessary, in steps of two velts. taps are shown a above the top of t really the cell connectors. The case of the battery s of mold- ed hard rubber to withstand the ef- fect of the acid. The individual cell jars are of hard rubber. and a seal-. . ing compound with holes, one for . each cell, cover the bttery top. : The dimensionsiof a battery umit are 41 inches inches by 3 inches. Several umits may be con- o nected in series as are dry batteries, in order to secure a higher voltage for a plat eircuit. induce os- to The current variable the plate circuits of their vacuum tubes. With such a battery it is only necessary to charge occasionally in- of buying new cells or com RADIO ERTERS POLITICS. |WANTS WOOD TO REMAIN. the| what is belleved to be the first of- 5 tion fre-I'ter of amateur transmitting appa-| American Chamber of Manila = ratus for political purposes has been made by Nelson Dunham of the New Brunswick Radlo Association, to Sen- ator Walter Edge. Mr. Dunham has offered Senator Edge use of his broad- casting apparatus, providing” neces- €| sary permission is obtained from the Department of Commerce. Mr. Dun- ham's station has @&, radius of 250 ymiles. ——eeee Urges Harding to Aid Retention. ~ MANILA, P. I, May 1§ requesting uce ( - e in the Philippines until his full program has . been placed in effect. Gen. Wood is on leave until Sep- The e tember from the University of Penr. strength may be improved by using|sylvania, whose preside he has ac- large capacity in the condenser and |cepted, but it is expe : comparatively small -inductance in|governmental program he sponsorcd . the coil for any particular resonance | will not be completed before next adjustment. January. With the signal . ¢ For three days only we are offer- ing free a box of Ashes of Rose Rouge with each pur- | chase of JAVA RICE POWDER at | 39c¢ per box. Ashes of Rose Rouge 3 STORES is a regular seller at 56c. Thus you gam an 89¢c value for 39¢. Colorite Straw Hat ! Bee Brand Root Beer Extract 15¢ | FREE Cake Palmolive Socap —with each 50c bottle Palmolive Shampoo at Ivory Soap Flakes 8c Pure Drugs and Home Remedies ’s| Incense Pots| Turkish Bath 29¢ Towels Worth 50c. Sale Price, Elramase anes L s aibre dibe vt oo s iHbYE e Ll L