A Small Electron Microscope

Abstract

A new electron microscope of greatly simplified design has been constructed. The instrument has a resolution of 100 Angstroms, yet is small enough to be mounted on a desk or laboratory table. Magnetic lenses are energized by permanent magnets. An accelerating voltage of 50 kilovolts is varied over a narrow range to provide means of focus. Images may be photographed on 2×2 plates. Plates may be changed in a minute, and specimens in fifteen seconds. Direct magnifications of 1500, 3000 and 6000 are possible depending on pole pieces used. Photographic images may be enlarged up to ten times. The instrument is free of x-radiation and completely interlocked and provided with shorting devices for protection from high voltage.