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 75
nJ o 6lRnr3 is magnetized byinduction from thefield of the helix inprecisely the sameway in which itwould be mag-netized by induc-tion if placed in thefield of a permanentmagnet. The newfield strength aboutthe coil is now thesum of the fieldsdue to the core andthat due to the coil.If the current is… … Fig. 62. Simple Electric Bell, and Connections. 61 52 ELECTRICITY AND MAGNETISM The strength of an electromagnet can be very greatly increasedby giving it such form that the magnetic lines can remain in ironthroughout their entire length instead of emerging into air, as theydo in Fig. 59. For this…
Electrical engineering
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