Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 120
point to point by variable curves. Knowing the centralordinate of the curve between two points, the central ordinate of one half thatcurve will be approximately one quarter of the first; but the greater the num-ber of degrees in the arc, the less near to the truth is the rule. 31.r3FcdIallT)cr MiXt… … Fig. 234 represents a plot of a railway line; in this plot the curve is repre-sented as a straight line, the radius of curvature being written in. This methodis sometimes adopted when it is desirable to confine the plot within a limitedspace upon the sheet, and it is convenient plotted thus…
Mechanical drawing
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