Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 148
n, a + a + a : a :: G g : G G; and so on to the last triangle ; the quantities g G, G G,&c, being the only unknown quantities become knownfrom the proportions. § 138.—A series of planesparallel to the base D B C,of the triangular pyramidA B C D, will give rise to aseries of strata or layers… … 1U NATURAL PHILOSOPHY. its centre ofgravity found; As either of the solid angles may be taken as a vertex and the opposite face as a base, and as the dividing planes may be passed parallel to each of the bases, it folloAvs that the centre of gravity of the pyramid must be upon the four lines drawn…
Mechanics · Acoustics · Optics
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