New Piezo Oscillations with Quartz Cylinders Cut along the Optical Axis

It is shown that oscillations of a new type can be produced using a quartz cylinder cut along the optical axis. Some of the electrode mountings used were suggested by Röntgen's experimental work and the more recent work of Tawil. In order to produce these oscillations it was necessary to use new adaptations of regenerative circuits as the driving circuit. These oscillations were studied experimentally through the medium of glow discharge patterns, a phenomenon of ionization produced by the quartz cylinder oscillating in a few millimeters of helium. They were studied theoretically by comparing the observed frequencies of oscillation with the computed values for the three different types or modes of vibration. Both studies indicate that these oscillations are of a true piezo-electric character.