The London, Edinburgh and Dublin philosophical magazine and journal of science . finite but small limit ( = 150), whenthe bar is supposed to be divided into an infinite number ofthin disks. As to the persistence of the linear laws in the caseof actual disks of small thickness, see bars B and C moment increases with increments proportional to those * The points thus defined would he the poles, if the conception of poleswere true and applicable ; in bars the distance of the foci is usually alittle less than that of the poles as ordinarily defined. In the presentpaper the foci are made u
The London, Edinburgh and Dublin philosophical magazine and journal of science . finite but small limit ( = 150), whenthe bar is supposed to be divided into an infinite number ofthin disks. As to the persistence of the linear laws in the caseof actual disks of small thickness, see bars B and C moment increases with increments proportional to those * The points thus defined would he the poles, if the conception of poleswere true and applicable ; in bars the distance of the foci is usually alittle less than that of the poles as ordinarily defined. In the presentpaper the foci are made use of as indicating by their position the distri-bution of the magnetism. They may be also regarded, with reserve, asthe points of application of the resultants of the lines of force. 144 Mr. R. H. M. Bosanquet on of n till after the point where w = 6; after which the momentfalls below the linear value. Bar A. Curve of Total Moments, n pieces in each of the m bars into which thewhole is divided. Bar A. Curve of Induction (intensity), in equatorial section of bar of n The moments were measured in the bifilar and the torsion-balance. They were originally measured in the bifilar withall the pieces in one tray in each state of combination. Thediscrepancy then found between the limiting moment and themoment of the current-turns required for temporary demag-netization (seepost.), gave rise to the suspicion that the induc-tion between the pieces dispersed about the tray was notnegligible. The measures were then repeated, the smallercombinations being taken three together. The numbers thusobtained are those above given. The accordance with thetemporary demagnetizing force being still imperfect, though Permanent Magnets. 145 much improved, a set was made with each piece moments had all fallen, but in proportion ; so that therewas no evidence of induction interfering in the values whichare given. The constant of the bifilar was determined by vibrating aleaden rect
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