Abstract
THE explanation of Franklin's experiment quoted in NATURE of December 4, p. 823, is purely dynamical. When a stratum of oil rests on water the restoring forces of gravity called into play by any disturbance of the interface are comparatively small, owing to the slight difference of density. Free oscillations are consequently slow, and so in Franklin's case apparently came within the range of the imposed periods due to the motion of the ship.
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