Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 269
Arrangement formoving thesemi-lenses; 200 NATURAL PHILOSOPHY. Illustration; Graduatedscrew head ; Spring; Value of oneentire turn ofscrew head j Value of onedivision. PIff. 60. … Method of usingthe dynameter; rangement indicated in the figure, wherein n is a right-handed screw with, say, fifty threads to an inch; n isa left-handed screw, with the same number of threadywhich works in theformer about a com-mon axis, and isfastened to theframe that carriesthe semi-lens E.The…
Mechanics · Acoustics · Optics
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-717-469.webp)
