[Electric engineering.] . ver, as the workingparts of this arrester are mounted in a porcelain case, there ismuch less liability of dust and dirt becoming lodged in theair gap. 9. The arresters just described are, of course, intendedfor use with direct current. For alternating-current sys-tems, the arresters described in Electjic Lighting, Part 2,in connection with alternating-current incandescent cir-cuits may be used. 10. Tjig-litning Arrester for Arc Lamps.—Althoughlightning may not get into the station, it sometimes punc-tures the insulation of thelamps out on the line andis responsible fo
[Electric engineering.] . ver, as the workingparts of this arrester are mounted in a porcelain case, there ismuch less liability of dust and dirt becoming lodged in theair gap. 9. The arresters just described are, of course, intendedfor use with direct current. For alternating-current sys-tems, the arresters described in Electjic Lighting, Part 2,in connection with alternating-current incandescent cir-cuits may be used. 10. Tjig-litning Arrester for Arc Lamps.—Althoughlightning may not get into the station, it sometimes punc-tures the insulation of thelamps out on the line andis responsible for manyburned-out coils. In orderto prevent this, small ar-resters, or, rather, simplyspark gaps, may be con-nected across the terminalsof the lamp. Fig. 8 showsa simple arrester for thiskind of work. This con-sists simply of two brasscylinders with a small gapbetween them. When adischarge comes along theline, it will jump betweenthe cylinders and thus passalong to the regular light-ning arresters, which will /. Ill—30. Fig. 8. 10 ELECTRIC LIGHTING. § 19 carry it to ground. The lightning will jump the gap inpreference to passing through the lamp on account of theself-induction and consequent reactance of the regulatingcoils in the lamp. 11. It will generally pay to have a number of arresters,connected between the line and the ground, distributed overthe line instead of depending on the station arresters alonefor protection. All arresters should be provided with agood ground connection, otherwise they will be of littlevalue. STATION EQUIPMENT. 12. General Remarks.—Having considered the lampsthemselves and the line used to convey the current to thelamps, next in order comes the apparatus for the generationand control of the current supplied to the various arc cir-cuits. This means a consideration of arc-light dynamos,switchboards, and methods of operating arc lights by alter-nating current. Attention has already been called to thefact that large numbers of arc lamps are run
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