The electron microscope, its development, The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 Coinmercial Electron Microscopes 1Z Slow fluctuations, that is, slow in comparison with 32 kilo- cycles, are suppressed \)\ an inverse feedback regulator.''' The principle is indicated in figure 21. The high voltage output is divided by a potentiometer, which, it may be mentioned, takes a ,l^im.^mM^i^ Fig. 22. Preparation of specimens for the electron microscope current considerably larger than the maximum millampe

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The electron microscope, its development, The electron microscope, its development, present performance and future possibilities electronmicrosco00gabo Year: 1948 Coinmercial Electron Microscopes 1Z Slow fluctuations, that is, slow in comparison with 32 kilo- cycles, are suppressed \)\ an inverse feedback regulator.''' The principle is indicated in figure 21. The high voltage output is divided by a potentiometer, which, it may be mentioned, takes a ,l^im.^mM^i^ Fig. 22. Preparation of specimens for the electron microscope current considerably larger than the maximum millamperes of the discharge tube, so that the rectifier works under rather steady current conditions. The divided voltage is balanced against a dry battery. (CJrdinary anode batteries fluctuate by less than three parts in a million during 30 second intervals.) The voltage difiference is amplified by a d-c amplifier, and the

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