[Electric engineering.] . X-—X—X—X—X- V—X—X X—X- D &%7 Fig. 6. the pole pieces. When a discharge comes in over the line, itjumps from c to c and passes off to the ground. Thecoils A, A act as choke, or reactance, coils to keep the dis-charge out of the dynamo, but sometimes additional chokecoils are inserted, as shown at L, L, in order to make the. FIG. 7. protection still more sure. This same style of arrester ismounted in a weather-proof box for use out on the line; theone shown in Fig. 5 is intended for use in the 7 shows two of these arresters connected in series forcircuits o
[Electric engineering.] . X-—X—X—X—X- V—X—X X—X- D &%7 Fig. 6. the pole pieces. When a discharge comes in over the line, itjumps from c to c and passes off to the ground. Thecoils A, A act as choke, or reactance, coils to keep the dis-charge out of the dynamo, but sometimes additional chokecoils are inserted, as shown at L, L, in order to make the. FIG. 7. protection still more sure. This same style of arrester ismounted in a weather-proof box for use out on the line; theone shown in Fig. 5 is intended for use in the 7 shows two of these arresters connected in series forcircuits on which more than 75 lights are operated. 19 ELECTRIC LIGHTING. 9 8. The type of blow-out arrester described in ElectricLight i)ig, Part 2, and made by the General Electric Com-pany for use on direct-current lighting and power circuits,is now also used on arc-light circuits. This arrester has asmaller air gap than those just described and, hence, affordsa better protection especially against static charges thatgradually accumulate on the lines and do not take the formof a regular lightning discharge. Moreover, 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
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