The Vibrations Must be Similar
BUT if the vibration be not similar at every impression, it
can never be carried beyond the number of actual impressions; for move
any body,
as a pendulum, in one way, and it will continue to oscillate in an
arch of the same circle, until the known causes make it rest; but if
after first putting it in motion in one direction, you push it into
another, it can never reassume the first direction; because it can
never more itself, and consequently it can have but the effect of that
last motion; whereas, if in the same direction you act upon it several
times, it will describe a greater arch, and move a longer time.
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