International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 332
ground first, in the former experiment.This resistance of the air may be nearlyequalized by making the two bodies of thesame shape and size. For example, if awooden and an iron ball, having equal diam-eters, were dropped from the same height.Fig. 130. they would strike the ground at almost exactly…
Railroad engineering
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