Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 729
ment, have had the effect to prevent such extensive observations as Mr. Bache hadprovided for, but it is to be hoped that each year will contribute to the number of our reliable observa-tions with this elegant apparatus. We proceed to state its principle and the arrangement of its parts. . -j The… … nam. As the rates of expansion of these two metals are widely different, the variation of temperatureto which the spiral is exposed, will produce a considerable movement of torsion, or rotation at the bot-tom of the helix, the top being fixed. This principle is familiar in Breguets torsion…
Mechanical engineering
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