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 353
tors which combinegood mechanical strength with good insulating properties. Theserequirements necessitate the use of iron for mechanical strength andporcelain or hard insulating composition for dielectric strength.A sample insulator, shown in Fig. 201, consists of an iron base *Rails are rated… … Fig. 201. Third-Rail Insulator 310 ELECTRIC RAILWAYS 213 with holes to permit screwing to the tie. (The insulator is placednear the end of the tie outside the rails.) On the base is a block ofmoulded insulating material—in this case vitrified clay—on topof which is an iron clamp which holds the…
Electrical engineering
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