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Updated: May 13, 2025
It is a paper you cannot make head nor tail of, and at the end come five or six long folded diagrams that open out and show peculiar zigzag tracings, flashes of lightning overdone, or sinuous inexplicable things called "smoothed curves" set up on ordinates and rooting in abscissae and things like that.
All the observations, electrical and mechanical, are made simultaneously. Graphic representations are of the greatest value in all comparative tests. Mr. The speeds are plotted as abscissae, and the electrical work absorbed in watts divided by 746 as ordinates; then with a series-wound motor we obtain the curve, EE. The shape of this curve depends on the type of the motor.
For the lines of beauty there are no abscissae and ordinates; circles and ellipses are not described by means of their algebraical formulae. As one of these simplified characteristic points as a mental appliance, we look upon the principle of watching continually over the co-operation of all forces, or in other words, of keeping constantly in view that no part of them should ever be idle.
To find these speeds we load the brake to different weights, and plot the resulting speeds and horse powers as abscissae and ordinates producing the curve, BB. Another curve, e = B/E made with an arbitrary scale, gives the commercial efficiency; the speed for a maximum external horse power is o a, and the speed for the highest efficiency is represented by o b.
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