Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 432
s of the arcs at their centres is nearly 2 inches, and its height,which decreases from the centre towards its ends, from J^ to -A- of an inch; the chords of the two arcsare 6-4 inches. This length, added to that of the two demi-rings, gives for the total length of thedynamometer 12 or 13 inches.… … There are two methods of stretching the spring, by pressing it in the direction of the perpendicularof the two arcs which form it, or by drawing it with the two rings at right angles to that perpendicular:these two limits of tension are indicated by two scales drawn on the same limb, called scales…
Mechanical engineering
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