Abstract
Piezoelectric quartz resonators, because of their mechanical durability and their small decrement, have found many well-known uses, particularly in frequency stabilization and in the construction of electric filters for high frequency channels, but their possibilities in connection with general laboratory use have not been realized. A piezoelectric ultramicrometer has been described permitting linear displacements to be measured to 10 9cm under ordinary laboratory conditions. Work has been continued on the application of this method to the precise measurement of the thermal coefficients of expansion of fine wires, the diameter of fibers, the effect of small temperature and pressure changes on the dielectric constants of gases, the estimation of moisture content in thin solid films, and the dielectric constants of thin solid and liquid films.
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