Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 232
are usually of the horntype. They consist merely of a pair of horn gaps and a series resist-ance connected to each line. Another form sometimes used consists of a pair of lignum-vitaeblocks which have charred grooves on their faces. These two facesare placed against each other and electrodes are… … Fig. 70. Choke Coils Used with Lightning Arresters which offer considerable impedance to high frequency dischargesbut not to the normal operating frequency. They are inserted inthe line between the arrester and the apparatus to be protected andhelp to make the discharge pass into the arrester…
Electrical engineering
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