. Carnegie Institution of Washington publication. ariety of constants in physics may be found fromthe relative heights of two communicating columns of liquid. This is, forinstance, the case in the classical experiment of Dulong and Petit on thethermal expansion of liquids. Again, if one of the tubes is subject to a specialforce acting in the direction of its axis, this force in its bearing on the liquidmay be evaluated from the resulting difference of heads of the one tube may be surrounded by a magnetizing helix and the effect ofthe axial magnetic field on the liquid in question
. Carnegie Institution of Washington publication. ariety of constants in physics may be found fromthe relative heights of two communicating columns of liquid. This is, forinstance, the case in the classical experiment of Dulong and Petit on thethermal expansion of liquids. Again, if one of the tubes is subject to a specialforce acting in the direction of its axis, this force in its bearing on the liquidmay be evaluated from the resulting difference of heads of the one tube may be surrounded by a magnetizing helix and the effect ofthe axial magnetic field on the liquid in question (, the susceptibility)found from the displacement of its surface by the presence and absence ofthe field, etc. It seemed to me worth while, therefore, to test whether itwould be possible to measure small displacements of this kind by passing thetwo component beams of a displacement interferometer axially through thetwo columns respectively, and to measure the differential effects in questionin terms of the resulting displacements of
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