The evening world. Newspaper, April 13, 1922, Page 16

NG WORLDS PHC COLUMN. 'y Capt. Robt. Scofield Wood. (D, FoC,, M. C., Croix de Guerre th four palms; formerly Commander 67th Squadron, Royal Air Force.) A TWO-STEP AMPLIFIER FOR $25. } Railio fans come in many classes, but all have the same thing in com- io, "Fans," “hams” or de- ong however, are divided Into two it classes, those who have money those who have not. With the unates of the first class it is only eksary to buy all ready for operation thing they desire, but the rest of Of the latter class, have to struggic on what we can improvise and make ourselves. Very often a few words the purchasing power of the “nim- ninepence” in its relation to radio makes life bearable and sends scurrying around to dig up and a ble some part that heretofore war ly attainable in the wild flights of immagination and then only by he painful sepatation from many en shekels. ‘The enthusiast who assombled his ret wet from a coll of wire, a fixer jenser, a crystal and a single phone, had that thrill of a lifetime which uD Bie stant’ concert , and who later worked on enlark: his set is the one for whom this icle Is written, Most of us go rough the various stages of the crys- set and graduate Into the ninzle de- or-amplifier tube class after a lone wn out existence of xaving for first ‘variable condenser and so on to the wisition of the revolutionizer — the jcuum tube, But here Is where we and look ahead to the dayr of rity when we can afford to spend se to a century note for that much eted and most “two-step lifer.” ¢ ‘There really is no good rearon for ing here any ‘more than there was ‘stopping when we switched from a fle slide tuning cof! to a loose coup- ‘The two-step amplifier can be as- ed in a very, short time and for roximately $25. THis include the s “aneverything.” impossible as it ‘seem, and it is one bit less service- fe and second to none in the two-atep fass. All that is necevsary Is two cuum tubes of the amplifying type, ich can be purchased for $6 apiece ‘amplifying transformers costine $4 ted and $%.unmounted; two VT ‘kets complste for $1 apiece, on’ theostats tor $1.50; to this afd $: a piece of bakelite for a panel and cents for solder and some No. 1+ desired ‘Feature for the day: ‘Music every hour from 11 A, M. to 6 10.30 P. M.—Maude Douglas Tweedy, 0; Danier Wolf, pianist composer, 145 P. M.— Police Reserve Band, Division, fifty-five men, .30 to 12.50 P. M.—Noon hour Len- at 3. 3f — Baseball ores by innings. P. M—""The Success I Want to Be,” Gordon Hargrave, character of Vegetable State College. 8,30—Muale. §—News. 9.05 to 9.20 — Music programme by Cadman Male Quartet, Regis Reagan, tenor; Edward Hellman, tenor; James Malzéne, Edward M. Coyle bass; Mrs. Mary J. Reld, pianist; Wal ter Boor, Hawalian yultarist. 9.56 to 10,—Arlington time signels Extension, Pennsylvania baritone; ee | Cuesttons and Answers 8. B. 8. Bronz—"Can I use thi ground for my sct that was originally put down for a lightning rod? 1 be lieve it runs into the ground about seven feet.” Answer—This should make an ideal ground for your instru ment. T, Weise Will you settle an argu ment for us? A snys that every re celving Instrument must have a tuning device in the form of a coil or vario coupler no matter how many stages 0° audio or radio amplifications are used and B says that the tuning coll cay he displaced entirely by a’ variable con denser, Who Js right? .Answer—A tuning device Is most necensary, but tt need not be in the form of a coll, ‘The variable condensér will werve very nice- ity for tuning In on assembiage such a you mention above. Peter Haves, City—"Wilt a loon aerial do away with all static disturt lances such as are felt when using ordinary ont door nerintt Anewer ‘The loop t* not susceptible to all of th lordindry atatic notses, but Ina reelor of very hirh static there te bound be some Aisturbance no matter type aerial is used. whit New Ham, Yonkerg—‘Wwhat {9 the heat typo nerin! to erect for the recen- tlon of the daily and evening concertat Wil! T have to bulldithe towers of any enecinl kind of material?” Answer The heat type aerial for you to ure te a single wire stranded conner wire nbont 100 feat tong, and approximately trenty feet above aurroundine ohject= Towers are not necessary, but want to build them well seasoned dry soo’ will give the best results for your Purpose. A! MacF.—"Is it absolutely necesenry to met a Neense to use nm amall trane- mittine set that will not be effective ra Alstance of a mile? Tf so. what are the qualifications and where can the license be obtained?! An-wer—Tt Ie absolutely necesanry to obtain a Meense for nil tynas of tranemittine sets s on the necessary y addressing the tom House, New York City. T. Wit have the plate and around the ment of my audion tube. Answer that Address .... Receiving Set.... Type . Call Letters .... issuance of Heenses. All information can be tadio Inspector, at the Cus- noticed of late a slicht blue mist that forma inside of id and fila- Is this forma- tion detrimental and what ts tt due tor” This Is a sign of a good tube is osciliating under tdeal condi John Stone, Reverhead—"TIs there any way of recharging a B battery that has THE EVENING WORLD RADIO CLUB Application For Membership Name ....cveeeeeee ges cewereeseseereseeecsume. PRINTED—SURNAMBE FIRST. STREET, TOWN, STATE. run down?” Answer—The ordinary 1 | for battery is not rechargeable, There is, however, a new type B battery that the purpose of pumping ‘water, THE EVENING WORLD, THURSDAY, APRIDL 13, 1922. bt The Department of Commerce has to It may be an electric washing machine or the escapement from some local battery office of | will be placed on the market very short-|recharging station, although the latter ly that can be recharge would not manifest itself in this way except under out of town conditions. ‘Try again. X. ¥, Z, city—"Here ta a little prod. lem for you to solve, I have an R. C set that functions perfectly except he- tween the hours of 2 and 4 P. M. daily. During these two hours there {is abso- lutely nothing (o be heard in the re- celvers but a continual hum that re sembles the ticking of @ clock, only very fons. ‘The bive aura as long as con-lfast, ‘There are no high tension lines | |Ey ivi fined to the space that you mention is}near me and i have Vooked incessantly 3 Receiving Set quite al) right. Tt ts only @ sign of lfor the cause but cannot locate it. = It is not difficult to build something belng wrong. When the lyou suggest what tt might, be? An-||F ta dls aie, whole vac, chamber te ett |awer — From your description of the your own receiving set and with a blue haze, cond 8} noise and that it is imposaible to tune} |_i quite i i brought about by the overheatne oflit out and that it is quite mauler and | |Fe abet yo Nel da hy the glass and metallic sections of thel recurs at the aame time daily, 1 would ||Ey me of the parts you need. tube by the application of tov much| suggest that you look posstbly In your We have a varied stock of current. own cellar or in the basement of some them: nearby house and see if it is not the leaks of some motor generator or the action of some small motor that is used 2000 Head Sets Variometers Tube Sockets Rheostats Wire Detectors Insulators WOOO OD. Oo eee eee to 2700 Ohm . Broadcasting Set... . -Location ..-Date.... Devoted to the practical | Throughout the Hntire FORMERLY MARCONI LN! %4 Worth Street Day Phone ran ot te A BOOK—accurate and depend- able—by the Editor of the Scientific American. Specially America's toremost School Sclence of Wireless Telegraphy & Telephony Afternoon and Evening Classes Year Kadio Institute of America DIALS, BAKELITE, CABINETS,. A complete stock of parts to builc your own Radio Set on hand. Beacon Radio & Electric Co. 246 Greenwich Street, written for “the amateur. Tells Near Park Pla New York what to buy and how to operate SL =— Radio Telephones—and how to JONES RADIO SETS listen in. 29.00 Price $1.50 By Mall $1.60 Get your order in today. are eunder Jones Radio Laboratories a Munroe Bt. Brookiyn, N. 4, SCIENTIFIC AMERICAN CO. (Masa & Co.) 238 Broadway, New York ee ee ee a a 8 Free box of Chiclets every time meet the - 1 in the Orange Tam. 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