A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 82
by thedifference of latitude of the two stations. But the ap-parent zenith distances as determined by the plumb lineare IE and IG. The deviation towards the mountainon each side exceeded 7. The attraction of the moun-tain being observed on both sides of it, and its mass be-ing computed from a… … rections, tnese data, when compared with the knownattraction and magnitude of the earth, led to a knowl-edge of its mean density. According to Dr. Hutton,this is to that of water as 9 to 2 ; but later and more ac-curate estimates have made the specific gravity of theearth as stated above. But this…
Astronomy
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