Title: The electron microscope, its development, present performance and future possibilities
Identifier: electronmicrosco00gabo (find matches)
Year: 1948 (1940s)
Authors: Gabor, Dennis, 1900-
Subjects: Electron microscopes
Publisher: Brooklyn, Chemical Pub. Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Achievements of Electron Microscopy 91
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Fig. 32. Tobacco mosaic virus. Magnification X 21,000 make it practically certain that this filament was formed by extrusion during the development process. The extrusion starts from a spot of the silver bromide grain when the latent image, ⢠. \r*^ 3f^-KIT'- »â -*!,â T^, -^ * ⢠â¦* Fig. 33. Photographic grains. Magnification X 125,000 (By courtesy of the Eastman Kodak Research Lab.) formed by a few hundred silver ions was produced by the exposure. This spot is determined by a minute speck of sulfur in the gelatin of the emulsion. The micrograph at the left is especially remarkable, as the silver threads in the Lippmann emulsion are only about five atoms thick. They are still appreci- ably above the contrast limit of the R.C.A. microscope. In metallography and other surface investigations, the trans- mission type electron microscope cannot be used directly. A great number of ingenious methods have been worked out to make film replicas faithfully reproducing the ups and downs of the surface, and thin enough to be used in transmission (500-

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