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Show Complete Flans for Bidding Palo Set, Designed by I). S. Experts c --'i.t.ev N-iibTMii 1 J i I'M I -tof L-Avovftto - 1 jSeawBsssaJ r-AWTlNM M LIAO fO Silt ttf T I - iMOULAro O- IIWULAT IH TOBC - H-WOPl I . ' ll ' s . 1 n L pWCCteoj itf AaTTtMaA yn-. TfLlPMOMI KgCtlVC Figure 1. Ths ifiltnni and Outside connections. Build your own rsdlo receiving atatlon. ata-tlon. Unci Psm will show you how. Hit experts of Ihe bureau of itand-ards itand-ards at Washington, have drelgned a simple "hook-up." wllh Inelructlnne. that they calculate should cost between be-tween $10 and III This eet ran receive conrrfa and in'iutn from transmitting etillnrs within lha city and from hlh iiwd broadcasting stations up t twenty-lii twenty-lii r. miles away. At martii. and when tie almnephere la clear and rool. even greater dlatanrea muy ln onverril. The apparatus ran rrccle wave l-ngtlm ranitiiig from Za t" "0 meters. ESSENTIAL PARTS. Koeentlal parts of Ida et.Horia are the enfenne, lightning awltrh ground eonnernans ' receiving ei-t an'1 "phone" Kither on telephone rrrelv-rr rrrelv-rr r n pair la used The lightning awltrh protects the m-fh ina set from damage by Hah:-I ring It ronnerta the nl'-im dlrei-tlv to ground when lha receiving station aa In Mae When the antenna and the connection to th ground art prop- erly ma. la and lha lightning awltrh la, closed, lha antanna aria aa a llahtnlna rod and la a prot"-lon to th hiilldlna Th' prlnrlpal part of lha atatlon H ha racHvina; a-l. Tha aat drarrlhrd j hrr la auhillvlild Into two parla. Ilir j tunar and datartor In mora rompll- catad la othr alcmanla ara addad. fHI ANTENNA. Tha anlanna la a wlra auapendad ha-twaan ha-twaan two alaxalad pilnla. It ahould rot ha laaa lhan thirty faat ahova ground and Ita lanlrth ahould ha about avnty-fn faat. KlKiira I Indlratra horlaontal anlanna, but It la not Important Im-portant ihat tha anlanna ba atrlrily liotisontal. Tha "laad-ln" wlra frnm lha amentia, amen-tia, ahould mn aa dlrartlv aa poaalbla to tha lllhtnlna awltrh. If tha poaitlon of tha al)olnlna bulldlnar or trraa la uch that lha diatanra htwran tham la araatar than about rlnhly-flva faat, lha antanna ran atlll ha hrld to a aav-' aav-' ant y-flva-foot diatanra batwaan tha llnaulatora by Inrraaalnc tha lanirth of I tha ropa (l) to whlrh tha far and of 'tha antanna la altarhad. Tha mix (H) Ivlna tha antanna In- I Aaaumlnf that tha moat aanaltlvw I point on tha rryatmJ haa baan found I by tha mathod daarrlbad In tha para- 1 araph. "Tha Taat Buaiar." tha raat i of tha oparmllon la to adjuat Ui ra- ' rio raralvlnv aat to raaonmnra or In 1 tuna with tha atatlon from which the ! mmaaa ara aant. Tha tunlna; of tha racalvlny aat la arrompllhi by adjuatlnc tha Inductance Induc-tance of tha tunar. That la, ona or both of the ewltch arme ara rotated until tha proper number of tuma "f wlra of the tunar ara made a part of lha metalllo circuit hatwaan the antanna an-tanna and around, ao that together with tha capacity of tha antanna the receiving circuit la In reaonance with lha particular tranamlttlnir atatlon. It will ba remembered that there are 10 tuma of wlra between adjacent con-facta con-facta of tha l-polnt awltrh and only I turn of wlra between adjacent contarta of tha 10-potnt awltch. The tunlna- w. 4, of the receiving; aet la beat accom- I pllahed by anting the right-hand awltch arm on contact 1 and ro- tallng lha left-hand awltrh arm over j Ita enntarta. If the deelrrd algnala t ara not heard, move tha hlght-hand t awltrh arm to rontart t2) and again I rotate the left-hand awltrh arm J throughout Ita range. Proceed In thle ' manner until lha dralred algnala are i heard. It will he advantagenua to know tha wave lengihe uaed by the radio transmitting trans-mitting atatlnna In tha Immediate vicinity. vi-cinity. A greater wave length requlrra more furna of tha coll. the test uzzer. The more aenaltlve apota on tha cryatal can ba found by ualng a traf huner. Tha teat txizaer la tiaed a i miniature local transmitting aet. Thl la ahown In Figure I. The huzaer dry . battery, and awltch may ba mounted , on the table or a arparate board. The binding poet marked "ground'- may ba on a terminal of the drv cell connected con-nected to the binding poat marked "ground" on ho receiving aet. The current produced by the buzier will ha converted Into aound by the , telephone recrlvera and the cryatal. ; the lojidneaa of the aound depending on what part of the crystal la In contact with lha fine wire. To find lha moat aenaltlve apot, connect con-nect the teat buner to tha receiving j aet. rloaa the awltch and If necessary adjust lha buixer ao that a clear role la emitted. Bet the right switch arm , on conluct point No. a and connect 1 the telephone receivers to tho binding j poata. f ; Loosen lha aet acrew of the crystal ' detector binding poet allghtlv and " ichanga the poaitlon of tho fine wire i to aeveral positions of contact with . 1 the crystal until tho loudest sound la heard In the phone. Then slightly tighten the binding post aet arrew. j Parts of Set And Cost Th following Hut ihnwa th appro!. mt ami of th part u4 In cnnnirucOnir thia rrivinir -j Hon. Th loul rtt will dpwnd I Urgmly on th kind nf apparatu purrhad and numrnsr of part mad at horn. ANTENNA. Wlr -100-150 ft No. 14 or 1 bar or lnuUti1 cnppr f .75 Itrtp or i ln-h. ro tver foot. 5 Iniilatnni pofrlit!n 50 1 lulljr i Uahtnlnr awltrh 10 amiwr hmtimrf awltrh 10 1 lorriain tub .10 GROUND CONNECTION. Wlr (tevm aa anlanna wlri). 2 clampa jo I Iron pip or rod 35 RECEIVING SET. i Ounra No. 24 copper wlr. riouhl ml tnn rovrrd 7J I Hound cardMiurd hoi 1 Hwltrh kitoha and hladt romplft 1 no 1 Hwltrh con tuna and num. .73 J Minding poata- t arrtw tvpn : 2 Jllnd!nK no" any typ ... SO 1 Crvsjtnl tfuld ;& 3 Wood arrwa- hrnmi. Inrh Innir 01 2 Wfmd m-rfw fur fuitnlnf panl to Imn .02 Witod for iianflti (frim pnrk-Inv pnrk-Inv hoi). ? I'uundn poriffln Jo Kamp cord -2 to i rente a root. TM htntxtwr ro Try hattry so Trlphon rrlvara. . . $4 00 to I 00 Total mat $10 70 to $14 70 rlirht pun. hwn in flgur 4. Thla pan) may be a pier nf wood ap prnxlmatHjr half 11 n Inch thU k. 4S lnrha wd and 71 tncha long. Th poaitlon of th aoveral hoi for th binding poMn, awltt h arm and awltch contact rnny flnrt b laid out and drilled. Th antenna and ground binding lt nmy bo ordinary II -12 brana bulla about 1 H Inch long with thrr nut and two waahen. Th flrnt nut bindn th hH to th panl. th rond nut hold on of th abort plerea of atlff wire, whil th tliird nui holda th antenna r ground wlr uw th cane may he. Th iwtuh urm with knob hown In figure S mnv b purriiaaed In th aajmmbled form or It muy b ron- ' feet , in Mtndy noil It may b 10 feet.l 1 horn oth'T metalllr rondurlor ntirh ' th 4 nmiiit of n drilled well, not far j 1 from th window, will be a aatiMfartoty I ' ground " j TUNING COIL. j Thin In a Irngih nf rani hoard tubing 1 1 with copper wlr wound around It. I j Th r.irdlniard tubing may h an oat-inMl oat-inMl box. Un rnrintrurllon wtlt be rte-j rrlbd In d lll A rllndr of wood or other nomn talllr aubatanre moy also 1 b uat'il. CRYSTAL DETECTOR. Th rrntal detector inr Klgur 1) may t of very almple conniructlon, Th rryntal aa It la ordinarily pur-rhaad, pur-rhaad, may b unmounted or mounted mount-ed In a ainall block yf metal. It la Important Im-portant that a good teated cryatal b uaed. A italrna rrvntal will b aafla-; aafla-; factory. Through binding poat (4) la., a nail with a wood knob or cork on Ita point and a 3 1-2 Inch pier nf No. 24 bar wlr attached below th head and bent aa to rat on th cryatal. Th cryatal detector la mad up of a teated cryaial, thre wood rrwe, a hurt plec of copper wlr. a nail, a Rt arrew tvu blndtna nowt and a Ftgur S Tunar, dt actor and cnncttng parti. I huaar. dry battery, and board on which to mount the complete nppnratu j Th binding poata, awltrh arm and j iwltch contarta may b purrhae from , dealer who handla anch good or they I may b readily lrnprovlad at home. I Th piece of wrWxl on whlrh th qulp ment la mounted may ha obttni1 from I a dry parking box and covered with paraffin to kep out molatur. I ar- ahould b taken In melting th : paraffin not to get It too hot. Kr thla , reaaon It la a good plan to inett It In a . pan art in boiling water. When tl paraffin Juat begin to amok It la at I th proper temperature. When th wiKKt parta hav been ! drilled and cut to an, the pa ruff in nhotild b applied nulrkly with a amall bruah. Vhn cold, th xrea paraffin paraf-fin nui at b carefully arrapM off with a atratgM pier of metal auch aa th bra a atrip In th dg of a ruler. ' CONSTRUCTION. Kollowlng la a darrlptlon of th methml of winding th tuning coll and th I'onatructlon of th wood pnnHa: T1TNIN1 COIL irte flgur 1) Th cardboard tubing la 4 Inchea In dlnm- I eter by 4 Inchea long. t)n end oft th tub nhould hav th cardboard covr glued aecurely ti It. About 2 ounce of No. 24 lor No. ; double cotton-oovvred copper wlr la uaed for winding th coll. Punch two tolea In th tube about half an Inch from one end. Wcava th wlr through th hole In auch a way that the end of th wlra will b firmly anchored, leaving about iwlv Inchea of th wlra fr for conntctlng. Rtart with th remainder of tho wlr to wind th turna in a alngl layer aboirt th tub, tightly and ckaIy together. After ten complet turn hav been wound on tha tube hold the turn tight and t&k off a tap. Thla tap in mad by twlatlng a ali-lnrh loop of tha wlr together at auch a plar that It will b allght- 1 atructed from a S-lmh allr cut from I a broom hand) and a bolt of auffl-1 auffl-1 riant lngih equipped with four nut j and two wahra. and a atrip of thin ! braa omwhat aa ttiown. I Th end of th awHrh. arm ahould b wid enough ao that It will not drojf blwen th contact point, but not ao wld that It cannot b aet to touch only a alngl contact. j j Th awltch contarta may b of the regular t-p fumtahsd for thla pur poa or thy may b C-I2 braa bolt with ona nut and on wahr each. 1 They may even ba braaa nails driven through th pane) with th Individual tap faitnd under th head or aol-dered aol-dered to th projection of th nail through th panel. Th baa la of wood approximately Inrh thick, tS (ncha wld and 10i) Inch long. Th tlephon binding powta ahould prefernbl h of th aet -acrew typ. WIRING. After th aeveral pan man tinned hav been conatructed and (with th exrcptlon of the tuning coll) mounted on th wood baa, th wire may b connected to th awltch arm and wood knob or cork. Th cryatnl I held In poaitlon on th wood haa by thre I bran wood-arrewa aa ahown In Figure, I. A bar copper wlr la wrapped tightly around th thre braaa arrewa for connection. Th aaaembtlng of th reat of th cryatal datertor la ahown In Klgur I TELEPHONE RECEIVERS. It la dealrabl to ua a pnlr of tele-phona tele-phona receiver connected by a head band, uaually called a doubt telephone headaut. Th telephone rclvra may b any of tha atandnrd commercial makea having a rvitatanc of between 2000 and 30oo ohm. Th douhl telephone receiver miv coat mor than all th othrr part of tb atatlon combined, hut It la d ulr-abl ulr-abl to get them, enperlally If it la planned to Improv th receiving aet later. A alngl 10OO-ohm telephone re. clver with a head hand may b uaed but with ls aatiafactory reautta. ACCESSORIES. lTndr tha heading of acceaaory equipment may b Hated binding poat. j awitch arm, awltch contact, teat-i .ulator to th houa ahould not b .lengthened to overcome thla difficulty. Jroaua by ao doing th antenna "lead-In" "lead-In" J would b lengthened. DETAILS OF PARTS. Th part will be mentioned her r-y refer nc to th Uttera appearing Sn Figure 1 and 2. A and I ar acrw eye aufflclently . trong to anchor th antenna at th - 'wnda. H and H ara pi of 1 -4 or I-l-lnch rope,' long enough to allow th an-jtenna an-jtenna to awing clear of th two support sup-port a. 4 D la ft plec of 1-4 or l-l-lnch rnp aufflclently long to make th dlatanc between E and O about vtnty-flv tU O lit alngU-block pulley. Th put-ly put-ly ahould not allow th rop to catch. K and O ar Inaulatora which may r constructed of any dry hard wood of aufflcUnt strength to withstand th train of tha antenna. Work about I-4xlilt Inch will rv. Th holes chould ba drllld aufflclently far from th end to glv proper atrength. binding poata and th tap may be con netted to th awltrh contact. A wlr la connected to the back of the left-hand switch arm bolt, twisted Into a spiral of one or two turns, tike a chick spring, and then led to th back of the binding post marked "ground." Connection la made to th binding post by removing th Insula- I tlon from th wire and clamping between be-tween the nut and washer. The earn wire la now passed through a amall hole and run under Jieath the 1 baa to th left-hand binding poat marked "phon." A wlr I then run from underneath th right-hand binding bind-ing poat marked "phon' to underneath under-neath the binding poat which la part of th cryatal detector. Th copper wire, which waa wrapped tightly about th three bra a wood acrew that hold th cryatal In place, la led underneath th baae, up through a amall hole, and la then connected to the back of the hlght-hand awltch arm bolt, twisted ! Into a spiral of on or two turna Into a clock-spring and then connected to th back of the antenna binding poat. Wrap on end of a plec of No. 24 bar copper wlr tightly around a nail, near th head. Inaert the nail In , the cryatal detector binding poat, and adjuat the wlr until It reata on th crystal as shown. Th detector Is completed com-pleted by pushing a cork or wood knob I on th pointed end of the nail. Th tap leading from th tuner should now b connected to th switch contacts. Hcrap th cotton Insulation from th loop enda of the sixteen twisted twist-ed taps as well aa from the enda of th two alngl wlr tap coming from th first and last turna. Fasten the bar ends of these wires to the proper awltch contract as ahown by the cor- ; reapondlng numbers In Figure S. I B careful not to cut or break any of th looped tapa. Th connecting wlrea may b fastened to the awltch contract a by binding them between th waaher and th nuL After all th wire from th tunr have been connected, the tuner ahould be fastened fas-tened to th baae by two or three small cr we passing through th cardboard end. The screws should be provided with washers. 1 OPERATION. I After all parta of this cryatal-de- I tector radio receiving set have been1 conatructed and aaaemhled th flrnt ! easentlal operation la to adjust the fine, wire which rest on th crystal to a senaittv point. Thla may b accom- 1 pllahed In aeveral way a; one method) la to uea busier transmitter. 1 ly alaggered from the firat connection. Thla method of taking off tape la ahown clearly In figure J. lroceed In thla manner until seven twisted 1apa have been taken off one at every ten turns. After these flrat aeventy turna have been wound on the tube, take off a ali-lnrh twiat-ed twiat-ed tap for everv succeeding single turn until ten additional turna have bean wound on the tube. After winding wind-ing the laat turn of wire, anrhor the end by weaving It through two holea punched In the tube as at the start, leaving about twelie Inches of wire free for connecting. It la to ba underatood that each of the eighteen tape la slightly daggered dag-gered from ona Just above, ao that tha lane will not be hunched along one line on the cardboard tube. It might ba advisable, after winding the tuning coll, to dip the tuner In ht paraffin. Thia will help to exclude tniilature. It Is Important lo have the paraffin heated until It Just begins to smoke, aa previously explained, so tihat when the tuner la removed It will have only a very thin coat of pur-afrin. pur-afrin. 1 Having completed tha tuning coll. aet It aside and construct the up- III ! m WHN i k vrr t L f lauit'sfjiL... , I Figure 2 Inside Connection.. Figure 4 The completed eet. It wood la used the Insulators should ba boiled In paraffin. Precautions Precau-tions In melting the paraffin are given under "Aoceaaorlea." Porcelain wiring rleata may be sub-atltuted sub-atltuted for the wood Insulators. OUTSIDE CONNECTIONS. F la the antenna about arventy-ftve feet long lietween the Inaulatora K and O. The wire may be No. 14 or If rnp-ter rnp-ter wire, either bare or Insulated. Tha nd of the antenna farther from the receiving aet may be secured to the Insulator (E) by any aatiafactory method, but care should lie taken lint to kink tho wire. Iraw the other end of the antenna wire through tho Insulator U) to a point where the two Inaulatora are eeparat-jed eeparat-jed by about Tl feet and twlel the 'ineutator tU) so to form an anrhor. an-rhor. Tho remainder of the antenna wire J. which now conetltutee the "leadln." ahould be long enough to roach tho lightning switch. K Is the lightning ewltch. For the tturpoee of s. small antenna this awltch gnay be tho ordinary porcelain base, la-ampere, single-pole, double-throw lottery switch. The "leadln" wire (J) la attached to thle awltrh at the mld-alla mld-alla point. The ewltch blade ahould be thrown to the lower clip when the receiving re-ceiving set la nut being uaed, and to the upper clip when It la desired to receive algnaie. L. Is tho ground wire for the lightning light-ning switch. The ground wire may be f tho -same else aa uaed In the antenna an-tenna and ahould be of sufficient length to reach from the lower clip of the lightning ewltch (Ki to the clamp on the ground rod M. M Is a piece of Iron pine or rod driven three to six feet Into the ground, preferably where the ground la moiat. and extending a eufflclent dlatance hove the ground so that tha ground lamp may be faatened to It. Care should be taken to sea that tha pipe le clean and bright where the ground Clamp Is connected. N Is a wire leading from lha upper clip of the lightning ewltch through the porcelain tube to) to the recelv-ng recelv-ng aet binding poat marked "antenna. "an-tenna. O Is a porcelain tulie of aufficlent length to reach throuth the window csalng or wall. This tube should be mounted In the cealng or wall an that It alopoa down toward the outalde of the building. Thla la done to keep tho rain from following the tube through tho wall to the Interior. INSIDE SET. Figure 1 shows tha radio set Installed in acme iiart of the houae. P la lha receiving aet, which la described de-scribed In detail below. N le thf wire leading from tha "antanna" "an-tanna" binding poet of the receiving t set through the porcelain tube to the tipper clip of Ihe lightning awitch. fThis wire, aa well aa the wire shown at W. ahou'.d be Inaulated and flexible. 1'nbralded lamp cord will serve fur tueae two learia. U la a flexible wire leading from Ihe receiving act binding pot marked r ground" to a water pipe, heating .- i tern or ootne other metallic conductor to the ground. If there are no water plpee or radiators In the room In which the receiving set Is located, the wire should be run out of doore and connected con-nected to a special "ground" below tha window. The ground for the lightning a, sw itch ahould not bo uaed for this pur- ( It le eeaentlol that for the beat 5 operation 0r (n receiving aet thla ; ground be of the very beat type. If tho soil near the houae la dry. It will be neoosaary to drive ona or more pipes or rods sufficiently deep to encounter en-counter moot earth. The dlatance between be-tween tho pipes will ordinarily not ex-. ex-. 'coed feet. Where, clay may bo I Y " 'aaaaeg r 1 A f Th rt'st that drew this picture Is s very careleae tel. r eaaaBaaaa iw f(. ,ow' Jui bo la about to make a fine picture, he ay upeete the Ink bottle. But the beetle seems to have mere geSBBjhv 1 aaT ' sense than the artist, for It thre wo the Ink Into certain 1Z ea I forme fer you to out out and piece together. Sy ao do. ggaw aaaaw r I ing you will aee the picture the artist Intended making. maW a" m J . Yau can meunt the entire picture en thin cardboerd and Wapwa se men cut out the different ferma and piece them together, T ew aaaaae w . f '. p vu tMn eut itim ,Pon1 thle aheet and put them te. . Y " . ar gather without mounting them. A new one will appeer -A V r soaaT BBBBoBoBBBaay M w each Sunday. Save all of them and when you have a 1 rlttA " Uw " u " l,v "'MK-SOTTLS OAMI" with wawa m your 'playmatee. Olve each playmate a eet of plecee to tat f II put together, and the one who puts his or here together " J J "rot must call eut "INK BOTTLE I" Thsit player, of . VrtliJ aoe course, wins the, game or s oartsln number of peints. fl |