. A Study of the Balance. and corresponds, with the steelpoint at about40 mm. below the knife-edge, to a possible tilt of the planeby 0*01/40 = 0*00025 radian, or five times the calculatedlimit of 0*00005. Nevertheless these modified suspensionsproved vastly superior to the far more complicated originalones and rendered possible the excellent results with heavy loads secured atthe A few discordant results were, however, almost certainly due toa specially eccentric position of the steel cups causing the maximumdislocation of the point of application of the load and so greatly exceedingth
. A Study of the Balance. and corresponds, with the steelpoint at about40 mm. below the knife-edge, to a possible tilt of the planeby 0*01/40 = 0*00025 radian, or five times the calculatedlimit of 0*00005. Nevertheless these modified suspensionsproved vastly superior to the far more complicated originalones and rendered possible the excellent results with heavy loads secured atthe A few discordant results were, however, almost certainly due toa specially eccentric position of the steel cups causing the maximumdislocation of the point of application of the load and so greatly exceedingthe permissible amount. A further refinement of the same idea was applied to the kilogrammebalance by using a steel point of the same type on the stirrup, but providinga separate arrestment, which lifts the steel bearing from which the pan issuspended, and so allows of making this bearing practically plane withoutrisk of accidental derangement. This appears to be the best and mostcomplete solution of the suspension Fig. 3.—Singlepoint inter-mediate joint. 220 Prof. A. E. Conrady. The Arrestment,The essential features of the arrestment are that the suspensions and thebeam should be gently and steadily lifted off the terminal knife-edges and thecentral bearing respectively, and that they should be replaced in exactly thesame relative positions as before when the arrestment is again of the arresting bar to make slight movements in the horizontalplane is particularly objectionable, because the suspensions will then be placedupon the knife-edges in various positions in different partial weighings, andthe point of application of the terminal loads will shift accordingly andcause a change of length of the lever-arm. The Mendel^eff type of arrest-ment, with arms swinging round an axis in line with the central knife-edge,appears to be the best, and the form given to it by Sartorius gives verysatisfactory results, which, however, would be rendered still more de
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectproceed, bookyear1922
