Show V D FORMS CROSS lection SECTION I 1 IL MRM AT wl NO MIN 11 1101 belf supporting COILS FINAL COIL WIRES HF 0 WITH ordinary ORD INAri Y ING L method of winding to produce the doughnut coil one of the latest mind most satisfactory in radio construction by FRANK R B S E M limit lit in n p than flow IK fill rv 1111 ion lol larN n i in nils in i s for dir UK tile ID nis in III of hiir ilailo tills is iau ixu d ly hy hii tion if ao I 1 SS 44 4 I 1 1111 up 1111 1 if I vir 11 ll cults and III lie nf if i n 1111 nis ait 1111 alii if ino nth of if i rinn ali lion and uni im wiio 1 ill iii itt it li st t boil boil if if 1111 i if ani s ani I in aillo llo is field aty M i hlll sti milded hulmn lip III or in III I 1 I 1 II 11 1 as I ism I 1 vre I 1 1 1 lie hotot I 1 iti st indo I liapi i 1111 ill I 1 lii li in i iain i ill 11 in i ill III tn fit s hi 1 nil i cecill si 1111 in fo if in illo i suit alt or if if ren in imin s pinging ili Itin ditl ill if oil ml atif if lie ire wid it 11 lir 11 nielli alck 11 raji n il I 1 ids if f III alir disi 11 v alre that hi it iho roll oil in UK the loro duct of nf six si lilis idlis she worl il on in tilt put part of linn induni lallis ld llIS 4 seek halll lill 11 now m U lal I 1 lw of lf ili lul iino mould lie he free fr c front ill alic all il ai alki II associated ilshik ifal 1 I fill olla jils corrects loss of 01 energy in ordinary laier wound it 11 von in arldt h r ilar loss of onue alikes alix plix illace c due to tile ali flirt bract hint through it 1011 n denar ns r tin the curn in 11 rit lit tends nd i to II 11 in 11 livi icon ad 1 weid julns ires us its bell 11 its liroi ili the lie ir I r itself thia i li asri achim Is 1 ilin I 1 to I III alk HI if 01 d of fit alic ill it i old nisi d liy by lie ill illi of if ill 11 Itic tors in III tn ow lo 10 loss dmd dionn hom voll type 1 of ills I 1 s alle ailed to I 1 i certain detent CM nt hy li rim idling the wares nt lit right fingles to tench OIK li ollier find cro sing fit ingvi the he first cp coil oil 11 III ide lii hy calling ill I 1 in out 11 vill cilc cle of 0 curd linia ith little protruding tabs ahi on tile li inside side A narrow strip of pasteboard p is lio ird wits hent around in tho IK forin of if it lide circle and pasted on earh side hide of the flat lu eicele die original idea was to wind the hi wire rv around ill alip forin hooking it 0 er tile 1 tits I nt at intervals when ilits coll coil alim constructed art and tested it ins found to tie he no better belter than linn present euils oila due to 0 o tile tho fact that tile the wires rtin nin parallel to 10 little nn extent making ln tile the distributed capacity of tile coll 11 ll high the next attempt was made by wind ing tile he wire around the form forin disregarding the protruding tabs so as aa to tn make a closed roll coil supported by the four edges of the cardboard strips TIUs coll coil was an improvement so BO larger forms were tried and tin it was decided to continue to experiment with alth this type of coll coil winding the wire over and over the circular form by hand became rather laborious so one of tile the engineers tried winding the coll coil on a straight form then removing and bending he fie coll coil in a circle to form a torpid coll coil it was difficult to keep tile wires in place with tills lila method so HO he tried pushing the wire in at every other face of the winding form with his thumb nail so that a string could be threaded through the ilie indentations and so BO hold the coll coil together when the tf form wn was removed measurements of this coll coil showed a decided improvement over other types as the greater allf e or if lie lo losers avs dup tn in tile dis anti coil loo alss avi s licen in n tho the flail coll coil developed au ti dred ills were io built aili in his olla in III search of tile i dicinit li r i alc iv or if nore lic and ii er i nil 1111 illein of the HIP ill H fisl ant alk I 1 li tow lo 10 antl ani vilich i ill li nt lit inilisi 1 I 1 if lie iilah coils livid to 11 bo 11 too llo lulls iii ti csc v so M it f fol form aiji MIS 1 to III hold the ali rf 1 11 binl lliel 1111 liot lint lidd Is 11 lit kllc I 1 1 if tilt coll oil now nou otto the andi millions in life li ilni roi IIII ming string hlila to n lio lie ihn wh ali d ll iiii li if lo 10 hold fill lie inq ulrici ilir figl i ber berv MI no loni longer iii q nry it at ns ill it avy lioy ere fi for the 1 ow ill elty lovs liss kllc high P of ilie I 1 lie olli colls oll i lonIng the atio win flings it 11 was nf to s sepa im rille lit I 1 lie furi fusilier lier apart resulting ili in it larger and jioio impractical oil 1011 etli Il lignelle field losses ls ille voll ill d it eloped tile low loss roll coil liny file wires blics in dialed Ic tied till nil around around special con COID lilt imd to n lie he developed ind ani it to this ilir nil H Is hold IK id in nil flit r 0 loop aerial that can be swung close to wall sketch herewith the loop was wag mounted tinse bilse up to one end of a stick I 1 then obtained a birdcage bird cage swivel imager and secured it to the other oilier enil end of tills stick 11 however Wever a strop hinge will work just oa as good if handy bandy the swivel hanger or hinge Is of course screwed to the wall or window frame the loop when out from the wall can be turned in the he desired direction at will when not in use it la Is turned parallel to the wall and then swung against it the idea Is to have it out of the lie way when not using the set this idea should prove welcome to many loop aerial users alvor el olson Port portland larA ore |