β Scribed by G.F.S.
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variation in the thickness of this layer; as it thins, friction rises, but not so fast as the pressure, and therefore the coefficient falls."
When the slider is placed on the plate flooded with lubricant some time elapses during which adjustments of the lubricant occur. In this " latent period " the coefficient grows larger for a minute or two.
When the slider is spherical the friction is proportional to the load and thus Am'onton's law holds.
G. F. S.
The Effect of Light on the Settling of Suspensions.
π SIMILAR VOLUMES
For one space dimension, the phenomenological theory of sedimentation of flocculated suspensions yields a model that consists of an initial-boundary value problem for a second order partial differential equation of mixed hyperbolic-parabolic type. Due to the mixed hyperbolic-parabolic nature of the
## Abstract An examination has been made of the manner in which light passing through suspensions of solid materials in water, and the light scattered from such illuminated suspensions, depends upon the particle size of the suspension. The following conceptions are introduced: the specific extincti