Canadian Jewellers Association · Toronto : Maclean-Hunter Pub. Co · leaf 596
the ball hav-ing been set in motion, instead of following the course e—i,which, by virtue of the forces of gravity and momentum, itwould take if it were at this point d< tac hed from the String, itis fore ( d by the tension of the string to folio.. inal < uivc until it reaches the point //.… … If it were not for the friction of the air and that caused bythe resistance of the spring at the end of the rod, a pendulumonce started would keep up its motion indefinately and we wouldhave perpetual motion. However, from these causes the pen-dulum loses a little of its force at each vibration,…
Jewelry · Jewelry trade
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