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 302
the balls at the same instant. (This must be done by one person.It is well to attach a string to the upright of each detent, as in Fig.167, pass the middle of the string through a hole or screw-eye near thecentre of the base-board, and, when all is ready, pull suddenly uponthis part of the string,… … FTG. 167. FOURTH CASE.—Let the suspending wires hang in slots 1 and 3(Fig. 165). Put around the smaller ball a belt of putty about 1 cm.wide and 0.3 cm. thick, so that this belt will just touch the largeball when both are hanging at rest (Fig. 168).(The object of the putty is to destroy…
Physics
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