Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 247
annot be accomplished inpractice, and hence such figure andmode of suspension are resorted toas to give these impediments theleast possible influence. The pendulum is usually mount-ed upon a knife-edge A as an axis,resting upon a well-polished plateof metal, or other hard substance,B ; and the… … Fig. 141.
Mechanics · Acoustics · Optics
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