SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Acoustic smoke rings. The device at lower right, seen mounted on a metal bar and a tuning fork, is designed to blow acoustic smoke rings. Smoke is drawn in on one side, and then emitted as rings according to the frequency at which the rod or tuning fork is vibrating. Artwork from the ninth volume (first period of 1892) of the French popular science weekly 'La Science Illustree'.
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