Abstract
Publisher Summary This chapter outlines the recent developments of the thin mica window electronographic image tube—the Spectracon—and gives an account of its present performance compared with that of the most efficient light sensitive photographic emulsion. This electronographic tube in which the photoelectrons from a photocathode are projected through a thin mica window, focuses on an electron image and records an electron-sensitive emulsion in contact with the outer surface of the window. The main operational characteristics of the tube are described under the following three headings: (1) Image quality, including resolution, contrast, geometry, and granularity. (2) Speed, or the rate at which a certain photographic density is reached. (3) Background, including both the fog background of the emulsion and the parasitic background from the tube.
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