This alternation is repeated over and over again, until all the energy of both pendulums is exhausted.
Things To Make by Archibald Williams is part of the HackerNoon Books Series. You can jump to any chapter in this book . here XXVI. Colour Discs for the Gramophone.—The gramophone, by virtue of its table revolving at a controllable speed, comes in useful for a series of optical experiments made with coloured discs bearing designs of different kinds. The material needed for these discs is cardboard, covered with white paper on one side, or the Bristol board used by artists.
This is a very interesting experiment, and will mystify onlookers who do not understand the reason for the apparent paradox, which is this. The air blown through the reel strikes a very limited part of the nearer side of the halfpenny. In order to escape, it has to make a right-angle turn and pass between coin and reel, and, while travelling in this direction, loses most of its repulsive force.
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