A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 114
erical, no two plumb-lines on the same hemispherecould be precisely parallel,except in cases where localdisturbances of the directionof gravity are caused by theneighborhood of mountains,etc. Plumb-lines far apartare in general very differentin direction, as is shown inFig. 56. On account of… … 92 PHYSICS. seen; that is, they are practically parallel. The action ofgravity upon bodies, therefore, gives rise to a large andimportant class of problems upon parallel forces. 80. Centre of Gravity.—Since gravity must be supposedto act upon every particle of a body, it is clear that thetotal…
Physics
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