Year

1969

Degree Name

Master of Science

Department

Department of Physics

Abstract

The photographic plate has long been the main tool used for astronomical observations despite its relatively low detection efficiency and nonlinearity. The relative advantages of speed and linearity which image tubes, based upon the photoelectric effect, possess over photographic plates, were first pointed out by Lallemand (1936). Since then much effort has been expended in the development and applications of a variety §f image tubes.

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