Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 326
magnet shouldsupport a permanent weight in order to re-tain its magnetism. By gradually increasingthis load a magnet may ultimately be madeto support a weight far greater than it woulddo at first. When contact is broken, owingto the weight being too great, the carryingpower falls most frequently… … Fig. 19G. 238] LIFTING POWER 303 to A iu absolute value, the attraction for each unit of surfaceis 277^4- (45). For the total surface of contact S, the force indynes is 27rA-S, and if P is the number of grammes whose weightwould just pull off the keeper, we have— gP=27rA^S^-%^. bir If we take A =…
Electricity · Magnetism
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