The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . none direction than it would when exerted in the pubUshes about thirteen different tables, relatingto rings of iron and steel in difierent states, and also tonickel and cobalt, under different conditions as to temper. 1 See Kowlaud, PMl. Mag. (i). IS, p. 330 ; also above, iv 25*. MA,G,N E;T I S M tna^nttizatinn, and so on ; the results for cobalt are, how-t-vci-,
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . none direction than it would when exerted in the pubUshes about thirteen different tables, relatingto rings of iron and steel in difierent states, and also tonickel and cobalt, under different conditions as to temper. 1 See Kowlaud, PMl. Mag. (i). IS, p. 330 ; also above, iv 25*. MA,G,N E;T I S M tna^nttizatinn, and so on ; the results for cobalt are, how-t-vci-, licld to 1)0 less satisfactory tlian those fur irou anduiul-cls fur a variety of reasons which ho aissigns. In Ireatin;^ his results grarphically, two method^ areTulluwud. lu the fn-bt the magnetic induction g is plottedaaiij^t the magnetizing force £) as abscissa. Figure 31s>h[jw=. the curve obtained in this way fi-om one of histiblus. .In the second method (1) the permeability =7 isplotted against the magnetic induction |3, or (2) K is plotted against the intensity of magnet-ization Ji. Either variety of the second method leadsto a curve having the general form shown in figures 35and Fio. 36.—Cu iOC?0 4000 6WJ0 ij; for Nickel at different tcnipLTatiircs. it reaches a maximum, and after that diminishes toa very small value. The maximum value^ is reached whenthe metal lias attained a magnetization of from -24 to 33of the maximum. The following table will give some ideiof tlio order of the magnitudes involved; -^ denotes thopermeability for ^ = 0, =r the maximum permeability,and ij the force for which it occurs. In some cases thjactual maximum is given, iu other cases simply the greatestrecorded in the tables of experimental results, and tUjvalues of £] are stated roughly; strict accuracy is of noconsequence, owing to the great variability of all theniacrnitudes. The curves obtained, whether for ct and g, or for k and^, fall very rapidly, an
Size: 1340px × 1864px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbaynesth, bookcentury1800, bookdecade1890, bookyear1892
