Cambridge School and College Textbooks: The First Three Sections of Newton's Principia, With an Appendix; And the Ninth and Eleventh Sections (Classic Reprint)

Excerpt from Cambridge School and College Textbooks: The First Three Sections of Newton's Principia, With an Appendix; And the Ninth and Eleventh Sections

This quantity of matter is, in what follows, sometimes called the body, or mass. It is known for each body by means of its weight; for it has been found, by very accu rate experiments with pendulums, to be proportional to the weight.

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