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For several years, it has been well known that, in the natural vibration of a piezoelectric oscillating crystal, there is a certain period proportional only to the thickness, but, so far as we are aware, there has been no concrete explanation for this vibration nor how its period is connected...
A brief critical summary of the principal contributions published on the theory of the subject is presented, followed by the report of a series of experiments designed to test the methods which have been proposed. It is concluded that while relative measurements can be made with sufficient...
Recent published results of studies on the flow of liquids through porous media under the action of gravity have shown wide disagreement in both the formulation and interpretation of the problem. A new attack on the problem has been carried out and has led to unambiguous answers to the questions...
An expression has been derived on the basis of the Maxwell‐Boltzmann distribution and Poisson's equation for the tangential surface conductance of an electrolyte in contact with a charged plane surface. One part of this expression is analogous to the result given by Smoluchowski for a Helmholtz...
Bidwell showed that the resistance‐temperature law for certain variable conductors (oxides, etc.) was of the form ρ = Ae Q/RT+ a T . Plotted in the form (1/ρ)( d ρ/ dT ) = Q/RT 2 − a he obtained for Fe 2 O 3 straight lines with a break near the recalescence point, the two lines having the...
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