Abstract
A special form of two lens scanning electron microscope has been optimised for scanning at television rates and used with a video tape recorder to observe a wide variety of dynamic specimen changes. The electron gun uses either thermionic tungsten or lanthanum hexaboride emitters giving low noise TV images with a beam current of 100 nA in an electron probe that can be as small as 300 A. Special stages may be used for dynamic microcircuit voltage contrast, mechanical motion such as ball bearing rotation, material testing in tension, compression and shear, and certain biological specimens such as human skin viewed directly in situ.
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