INTBODUCTOBY - 



M-ity and Srlf-indiirtion." hy -I. A. Finning : "Some 

 rimriital Investigations of Alternating Currents," by 

 .under Siemcii- : " 1 ,\i" nm.-ntal Kr-raivhr> ,.n Alt. -rnate- 

 currrnt Transformers," l.y -I. A. Firming. 



PC could hr no hrttcr inti odurtion to tlir >uhjrrt than 



thai -irt'ordrd hy a caivfuUtudy ofth86 srvni papers and more 



ially of thr discussions t> uhirli they gave rise. S 



ty years have since ; . and the present tn-atise is 



ly la>rd on thr \v.rk of tljose who, profiting ly tin- 



:ionsofCrompt..n, Ferninli, Finn vbes, 



. Swinhurnr, Silvanu- 'I'liomp-on and 



Flil.ii f j'hom. ( ,n, lia\r rarried on the m.-rr pn^air task of 



j thr runnnrr-ial tran-f. rmT of the pn - lit 

 My first intiinatr a.-.piaintanrr with tli DMT 



was f.-ri: -s; \\hrii.undrr thr torrid blftMOfl 



irhieb e id, 1 1 spent a 



month or BO at th. .iaily ta-k of pullinLT little truck-loads of 



into plar,- a-_'ain>t thr wall of thr t.^tinu' i 



"cold" resistance, connecting up thrir 



ndaries for polarity ousting 



i thr M M thOM found in varius respects 



rs to a ' 

 d numhrr of hour-. This prO06tt 



:id h\ thr rru'ist, 



of ear i i ; t results in A record hook. 



largest of tl wa> onl;, , , and 



tin ni..>t ii -mil sizes were those of I 



Capa.'i:y. Ti,. ;, W( ' 



uid thr i s were Usually \\uuiid so : 



1000 or 2000 volt x. th 

 ko giveeith- r g&oi l (l I Its on no 1 



s was n n\ task 



II \\:is thr'.l -Jl\, 



ind in- ' 



: the 



