Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 67
Longitudinal Section of Gun,Fig. 29. … Dropped and Projected Balls. The falling ball is impelled by the force of gravityonly. The projected ball is acted upon bj two independentforces—the force of gravity, which draws it toward theearth, and the projecting force, which tends to move it ina horizontal line. The projecting force is…
Physics · Lantern projection · Electric apparatus and appliances
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