## Quartz Resonators and Oscillators |

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air gap amplitude angle approximately axes beta quartz calculated capacity condenser corresponding cosh crevasse Curies curve cycles per second damping decreases difference of potential dimensions direction disc distance electric axis electrical circuit electrodes equal equation experimental faces filament formula fundamental Giebe and Scheibe given glow grid leak hemihedral increased kilocycles per second length longitudinal vibrations luminous resonator maximum measured Meissner modes of vibration modulus of elasticity National Physical Laboratory natural frequency Nicol prism obtained optic axis oscillatory circuit output overtone oxygen oxygen atoms parallel parallelepiped perpendicular piece of quartz piezo piezo-electric constant piezo-electric effect plane polarization positive potential difference pressure principal axis produced properties of quartz quartz crystal quartz oscillator quartz plate quartz resonator quency resonant frequency rhombohedral rotation Section shown in Fig silicon atoms strain stress structure surface symmetry temperature coefficient thickness third axis transverse vibrations valve variation voltage wavemeter zero