Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 45
roximately simple pendulum.Partly fill a small glass funnel (Fig. 19) with fine dark writing sandand suspend it from a frame above by means of a string (say) 1 mlong. It can be made to oscillate at will in any direction and thesand falling upon a horizontal surface, e.g. a large sheet of whitepaper…
Physics
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