The electron microscope, its development, The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 92 The Electron Microscope 5,000 A). One of the most interesting is the polystyrene-siHca method of Heidenreich and Peck,*^^ which was used in reproduc- ing the calcite surface in figure 34a. The specimen is first molded into polystyrene, and this is coated by evaporated quartz. The most surprising effect was discovered, namely, that as long as the layer is thin enough, the silica molecules spread on the polystyrene like a liquid an

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The electron microscope, its development, The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 92 The Electron Microscope 5,000 A). One of the most interesting is the polystyrene-siHca method of Heidenreich and Peck,*^^ which was used in reproduc- ing the calcite surface in figure 34a. The specimen is first molded into polystyrene, and this is coated by evaporated quartz. The most surprising effect was discovered, namely, that as long as the layer is thin enough, the silica molecules spread on the polystyrene like a liquid and form a perfectly smooth outer surface. After dissolving the polystyrene mold, the silica film can be introduced into the electron microscope. Fig. 34a. Electron micrograph of polystyrene-silica replica of a freshly cleaved calcite surface, obtained by R. D. Heidenreich, Dow Chemical Company. (By courtesy of Dr. V. K. Zworykin, Associate Director of )

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