ALUMINIUM plates with large crystals, obtained by recrystallization of fine-grain material, show many crystals with a particular type of grain boundary: they appear as 'pointed' inclusions at the edge ...
A BRIEF outline of the history of the crystal filter has been publishad by J. E. Bsnson (A.W.A. Tech, Rev., 5, 191; 1941). The earliest application of piezo-electric crystals to frequency - selective ...
The largest assemblage of extremely rare worked Neolithic rock crystal was uncovered by archaeologists from the University of Manchester at the monumental complex of Dorstone Hill in Herefordshire, ...
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