n the plane of one of the curves, and being nicus and Keppler. In fact, half a century after K!ep- ciples of a science should be frequently misunder- described by the points in the plane of the other curve. pler's death, Newton proved that planets, under the stood, even by the very workers in its… … of phoronomy the rela- Mechanics may be de- Figs. 3 and 4.—Elementary Couples: Couples of Figs. 1 and 2.—Elementary Couples: a Couple tive motions of celes- fined as the science of of Screws and a Conple of Prisms. Rotary Bodies. the causal relations tial bodies, not only between the motions…
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