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A mechanical rectifier for use at commercial frequencies has been constructed. Accidental electromotive forces have been so far eliminated that it can be used with a sensitive direct‐current galvanometer as a detecting instrument. Four galvanometers have been tried and the results are...
A precision condenser of small capacity change, and an accurate method of calibrating it, is described. In measuring very small capacity changes it has several advantages over the usual series condenser arrangement.
Crystals have been prepared for use on the two‐crystal spectrometer by grinding and etching the cleavage faces. The widths of rocking curves in the (1, −1) position have been investigated for different conditions of the surfaces. The etched crystals have been found to give higher resolving...
In the heterodyne beat method of measuring dielectric constants of vapors or very dilute liquid solutions, it is difficult to eliminate frequency drift in the one oscillator. Apparatus which will almost completely eliminate this drift is described; it has the further advantage of operating...
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