ni:sn;\ cii.ik.h i r.Hisrus o/- r.i.r.ci i<(>M.n;\i.is 2\7 



im-shiiig of layiTsoiu- wirt- Dcriipics an area .8(5(1 (/-'. In icliial winding 

 praiiiio a roniliinatioii of ilio two layups is ohtaimd wliirli gives 

 .".•() (P scjuare ini-lu-s as the space occiipii'd !)%• one wire. The area 

 .'.10 (P may l)0 taken as indicating perfect wiiidiiii; so that if the total 

 wintling space or area is represented by .1 .md ihc toi.d turns by 

 .V, wo have under the liest conditions 



^=.90rf2 



The coinparaii\e merit or elViciencv' of any other winding ma>- there- 

 fore be expressed as 



.90«f=Xl00 



= per cent efficiency. 



.\s each size of wire and insulation winds with a sonu-w liai dittcront 

 etTiciency, the variation in the value A/N is generall\ (Ktirmined 

 experimentally for each gauge of wire. Thus 



^-K = C,cP. 



(1) 



The constant Ci is often designated as a space factor constant and 

 may include the insulating or interleaving paper used throughout the 

 winding. The following are representative values of K for enamel 

 .Hid silk insulated wire of Western Electric Company manufacture. 



Values of K 



