Schauberger
In a pipe, which is described in greater detail in the patent application to the Reich's patent office[12], specially shaped resistance-inducing vanes are incorporated, which are made of a potential-increasing material and are installed and aligned along very particular curved paths on the inner periphery of the pipe-walls. [The Energy Evolution - Harnessing Free Energy from Nature, The Liquefaction of Coal by Means of Cold Flows]

See Also

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cycloid-spiral-space-curve
inner
inside
internal diameter
periphery