The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 Electron Microscopes IVitlwut Lenses 27 metals. Their cathode was a thin wire of the metal to be investi- gated, etched to a fine point, approximately hemispherical, with a curvature radius of about X ^^^' cm. As the bulb radius was 5 cm, the magnification was about 200,000. The pointed wire was welded to a filament, as shown in figure 8, which enabled the sample to be heated during observation. Figure 9 is an example of the many beautiful patterns obtained in this inv
The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 Electron Microscopes IVitlwut Lenses 27 metals. Their cathode was a thin wire of the metal to be investi- gated, etched to a fine point, approximately hemispherical, with a curvature radius of about X ^^^' cm. As the bulb radius was 5 cm, the magnification was about 200,000. The pointed wire was welded to a filament, as shown in figure 8, which enabled the sample to be heated during observation. Figure 9 is an example of the many beautiful patterns obtained in this investi- gation. It shows the emitting patches of a minute single crystal of nickel and the changes which are produced in them by heat treatment. Fig. 8 On w^atching these microscopes in action, one can often see very small bright points moving hesitatingly about on the surface. Some of these are probably caused by single ions, crawling about on the crystal and producing increased local emission. To make a single ion visible is an achievement unmatched up to now by any of the more complicated microscopes.
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