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
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… … Fig. 99. The rod is now deflected in the opposite direction, and theamount of deflection is again carefully measured. The secondmeasurement is made as a check upon the accuracy of the first.The force required to twist the thread as much as it was ASTRONOMY. 85 twisted by the deflection of the rod…
Astronomy
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