Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 325
magnet shoukisupport a permanent weight in order to retain 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 in absolute value, the attraction for each unit, of surfaceis 27rJ.^ (45). For the total surface of contact aS, the force indynes is IttA^S, and if P is the number of grammes whose weightwould just pull off the keeper, we have— If we take A = 800 for steel, we…
Electricity · Magnetism
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