. The Street railway journal . FIG. FOR RAIL-WAY CIRCUITS FIG. 2.—DISC FORM OF CHOKE COILFOR ALTERNATING CURRENTS Manufacturing Company, which was a pioneer in the use ofthese devices as a means of protecting electrical apparatus,has for the past twelve years been engaged in the manufactureof choke coils and the development of protective appliances forcircuits of both high and low potential. For low-voltage circuits, such as railway work, the form. illustrated in Fig. i has been developed. The conductor iscoiled in the form of a cylinder and is mounted on a woodenspool, each turn
. The Street railway journal . FIG. FOR RAIL-WAY CIRCUITS FIG. 2.—DISC FORM OF CHOKE COILFOR ALTERNATING CURRENTS Manufacturing Company, which was a pioneer in the use ofthese devices as a means of protecting electrical apparatus,has for the past twelve years been engaged in the manufactureof choke coils and the development of protective appliances forcircuits of both high and low potential. For low-voltage circuits, such as railway work, the form. illustrated in Fig. i has been developed. The conductor iscoiled in the form of a cylinder and is mounted on a woodenspool, each turn being insulated from its neighbor and the com-pleted coil skilfully protected from moisture and lightning arrester is connected to a terminal plate laidacross a few turns of the line end to provide a selective pathto earth. In alternating-current work, the disc forms of coil, as shownin Fig. 2, have been found to give the best protection. The insu-lation of these disc formchoke coils, which are knownas the Westinghouse type 7,has great dielectric strengthand extends beyond the sidesof the conductor, so thatthere is little likelihood ofthe discharge jumping fromterminal to terminal or fromlayer to layer. The coils areconstructed with a large fac-tor of safety. Very largecooling surfaces are pro-vided. As the coils arewound with but one turn perlayer, every turn is exposedon two sides and offers amaximum radiating surfaceto the cooling influe
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
