A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 220
other.It there touches a pinprojecting from a rodwhich rests against anopposite upright, in acircular support ateach side. This rodterminates at one end in an arm bent at right angles, which is connected bya cord and pulley with an index traversing a scale marked with degrees.Near its extremity is…
Physics
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