Letter | Published:

The Terminal Velocity of Fall of Small Spheres in Air

Naturevolume 82page279 (1910) | Download Citation



AT the Winnipeg meeting of the British Association Prof. Zeleny and Mr. McKeehan read a paper on the terminal velocities which they had found when Lycopodium and other small spores fall through air. The measured terminal velocities were only about half those calculated by Stokes's formula. The fall was steady, no Brownian motion or rotation being visible. The authors of the paper have since succeeded (see NATURE, December 9, 1909, p. 158) in making minute spheres of wax and mercury which do obey the theoretical law, but add that The reason for the deviations in the former cases is not clear.

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