Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 114
o mounted on 312. Thescrew, No. 306, passes through steel washer, 307, tube,312, and asbestos disc, 313, so as to clamp them togetherwhen screwed into weather-proof box, 302. The flexibleleads, No. 310, pass through porcelain insulator, No. LIGHTNING ARRESTERS—LOW VOLTAGE 115 303. The cover, 301,… … Fig. 44b. Arrester parts as shown in 44a assembled ready toscrew cover on. Protection of Lines. Question 23. How should signal lines be protected? Answer. When on pole lines an arrester should beplaced on pole about every half mile; when run in con-iuits or tunnels one should be placed at each end…
Electricity
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