Show BLACK ENAM ENAMELED LED WIRE I IFor For Certain T Telephone Uses Uell Better Her I Tb Than the Silk Slik Covered Cohered Demands for ran Insulated wire which would effect an Increase In the tho efficiency effi effi- clency of ot an electrical product while decreasing de- de creasing its cost led to the the- develoPment develop develoP- ment of a a black blade enameled Insulation for ma magnet net wire Prior to the development of oC this wire att attempts were ivere made to produce a satis satis- factory factor substitute for Cor silk Insulation These tv were not successful according to Am the Telephone Review Jew as the product SI either ethe- did not hOt Possess possess possess' many man of the es- es features of satisfactory r Insulation tion or It was not such that It could be manufactured d commercially This black enameled wire which Is Isn Isnow Isto isnow now ul used to a great extent In the magnetic magnetic mag- mag n of ot rela relays s 's drops signals ringers ers otc etc i In H the tho Bell telephone apparatus ap- ap Possesses many man advantages n as ash compared With Hh wire Installed b by methods methods meth- meth th that h at t used to prevail pre It Is claimed for Cor this wire ire that while w the tho black enameled Insulation is only from Crom 2 Inches to Inches In Inso thickness It Its so elastic that when hen the Wi wire lIS to the breaking point iI it does oes not not break until the wire Itself gives way way- It U will vill withstand m the ordinary atmospheric atmospheric at- at Corrosives and the severe atmospheric conditions of shops factories fac- fac tories il climates and the seacoast sea coast Indefinite indefInitely It is hs not Injured b by Indefinite exposure exposure ex- ex to t temperatures tures s o of 50 dC degrees a t temperature which wIll destroy the 6 tensile le strength of ot cotton or silk SUK In a a. r w fc-w w hours It cannot be te remo c removed from rosa the wire b bv by the or ordInarY solvents an and the wire can be handle as easily and as alJ a silk Insulated hated wire One of the great possessed by black enameled wire is 18 Its small diameter as compared as wIth that of single lo silk or insulated wire cotton The winding s a e for num- num n a ber of turns Saved I is aboUt twenty twenty- five pe per Tu t dt Jt I lint line of enu- enu Inc l Z z C. C M. M J I. I carpet i 2 I I r J J. J |