An easy introduction to astronomy for young gentlemen and ladies : describing the figure motions, and dimensions of the earth : the different seasons : gravity and light : the solar system : the transit of Venus and its use in astronomy : the moon's motion and phases : the eclipses of the sun and moon : the cause of the ebbing and flowing of the sea, &c. (1812)
Ferguson, James, 1710-1776 · Philadelphia : Johnson and Warner, Ann Cochran, printer · leaf 61
solve yourquestion, if gravity acted, as all mechanical caus-es do, only on the surface of bodies. Let S be the center of the sun ; and *£/, Sef SfiSg, be, as it were, lines of attractive force, drawingthe three square plates A, /?, and C\ toward S*These lines touch only the four corners of… … ■■■•■„:■ ■ I 0 ter in each plate requiring an equal degree ofpower to draw it equally fast toward the sun. Now, let the plate B be twice as far from thesuns center as the plate A is ; the plate C threetimes as far, and the attractive forces equal on eachplate, as if the above-mentioned four lines…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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