Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 165
160 WELLSS NATURAL PHILOSOPHY. Fig. 151. … ^adually roll forward to c.When W.1S the tube until it was turned half round, as in theposition, tig. 2, the marble would be at a; now,if at liberty to move, it would roll down to b.but this effect, which we have supposed accomplished all at once, is really, gradually performedand a rolls down…
Physics · Science · Technology
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