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Oscillating piezoelectric plates of different frequencies have been made from California and South African Tourmaline. These plates have a frequency response of approximately 3770 kc per millimeter of thickness. The temperature coefficient for both specimens was found to be negative and is about...
Considerations of geometrical optics indicate that the limiting rays travelling along the interface between two homogeneous elastic media should carry inappreciable amounts of energy. Nevertheless, the ``first arrival'' waves in refraction shooting processes, which give linear time distance...
The static and the impulse breakdown of paraffin oil and xylol were investigated by means of the electro‐optical shutter. To obtain satisfactory operation of the shutter it was found necessary to use a double shutter consisting of three crossed nicol prisms and two Kerr cells. Because of the...
Thoriated tungsten wires have been so heat‐treated in gas as to develop variations in grain size, ranging in length from 4 μ to 3 cm. These variations produced marked changes in the thermionic emissive characteristics, such as rates of deactivation and of activation and duration of emissive...
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