The outlines of physics: an elementary text-book . 0vl^O-Um^ qto Fig. 14. THE LAWS OF FALLING BODIES 21 from their form offered a large surface to the action of theatmosphere, into compact pellets, he found that they ap-proached the denser bodies more and more nearly in theirrate of falling. Heavy metals like gold, on the otherhand, when beaten into foil, fluttered slowly downwards. 22. Gravitation. — The general conclusion to be drawnfrom these experiments is that the earth exerts, upon eachparticle of matter separately, a force which is proportionalto the mass of the latter, but is independe
The outlines of physics: an elementary text-book . 0vl^O-Um^ qto Fig. 14. THE LAWS OF FALLING BODIES 21 from their form offered a large surface to the action of theatmosphere, into compact pellets, he found that they ap-proached the denser bodies more and more nearly in theirrate of falling. Heavy metals like gold, on the otherhand, when beaten into foil, fluttered slowly downwards. 22. Gravitation. — The general conclusion to be drawnfrom these experiments is that the earth exerts, upon eachparticle of matter separately, a force which is proportionalto the mass of the latter, but is independent of the materialof which it is composed. This force is called gravitation. 23. The Guinea and Feather Experiment. — At the timewhen Galileo made his investigations, the knowl-edge of the properties of the atmosphere was veryvague and incomplete. No instrument for the pro-duction of a vacuum had as yet been half a century later, when Otto vonGuericke invented the air pump (Cologne, about1650), one of the uses to whic
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
