Some Effects of Vibration on X-Ray Diffraction by Crystals*
A technique is described which makes use of Bragg reflection of z-rays to give a “picture” of the vibration pattern on the face of a crystalline plate. The dependence of this pattern on the direction of the x-ray beam is illustrated, and a comparison between dust patterns and x-ray patterns for a vibrating bar fairly well establishes that the local curvature of the crystal is responsible for the observed increase in x-ray reflection. Reference is made to quantitative measurements on statically bent quartz and to an approximate theory treating the effect.
Figures & Tables
Seismic Wave Propagation: Collected Works of J. E. White
This first chapter sets the stage for the later technical development of Dr. Whit’s career in applied seismics. Experiments, f’wst at the Acoustics Laboratory of the Massachusetts Institute of Technology and later at Mobil Oil and Marathon Oil, provided insight into the general problems of impedance measurements, transduction, filtering, and attenuation. These papers also serve as a bridge to show geophysicists how theft own experiments in seismology naturally interface with (indeed, arose out of) the larger world of sound measurements in air and water. These experiments demonstrate the power of geometrically constrained experiments to allow verification of approximate (and in some cases, exact) theories of sound.