Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 101
98 and 99. Two small balls of lead, b and b. are fastenedto the ends of a light rod e, which is suspended from the pointF by means of the thread FE. Two large balls of lead, Wand W) are placed on a turn-table, so that one of them shall 84 ASTRONOMY. be just in front of one of the small balls, and… … they are stopped by the torsion of the thread, which is thenequal to the pull of the large balls. The deflection of the rodis carefully measured. The table is then turned into the posi-tion indicated by the dotted lines in Fig. 99, so as to reversethe position of the large balls with reference to…
Astronomy
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