Laplace, Pierre Simon, marquis de, 1749-1827, Bowditch, Nathaniel, 1773-1838, Bowditch, N. I. (Nathaniel Ingersoll), 1805-1861 · Boston, Hillard, Gray, Little, and Wilkins · leaf 735
he refraction, in proceeding from E to B, represents the refraction of a depressed body situated at P ; and the refraction from B to H \s equal to the refraction of an elevated body placed at /, whose apparent altitude is the same as the apparent depression of P ; so that the sum of the refractions… … cls = 0 [8407]; and as p is a function of r or s, [8137, Sic], we shall also have df = 0; substituting these values in the differential of u [8411], we obtain, at the same point D, du^O. The differential fid does not however vanish at the point D, because it is proportional to dv, as we shall see…
Celestial mechanics · Tides · Capillarity
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