St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 49
decreasing the resist-ance to the current on itsway from X to V. Cur-rent regulators are madeupon this principle. (See Apparatus Book, Chap-ter I\., for home-madeswitches.) S7i7/c/i boards are madecontaining from two orthree to h u n d r e d s o f ful in connection withresistance coils. B3join-ing… … i^ £ a x> Fig 59- PUSH-BUTTONS, SWITCHES AND BINDING-POSTS. 47 switches, and are used in telegraph and telephone work,in electric light stations, etc., etc. (See Chapter onCentral Stations.) Fig. 60 shows a switch used for in-candescent lightingcurrents. 63. Binding-Posts are used tomake…
Electricity
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