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External propagation
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experimental demonstration as explains the apparent paradox presented by a nucleus within the surface of which the grains are at rest, in the normal piling, propagating through the medium in one direction, while the only mean motion, that of the grains in strained normal piling, outside the nucleus, are moving in the opposite direction.
The apparatus is shown in Figs. 6 and 7.
In this apparatus, Fig. 6, the six balls in close order in the lower chase constitute the
Fig. 7.
