Abstract
A comparison is made of vacuum electronics and the new electronics using crystalline solids. The very stringent requirements as regards chemical purity and structural perfection of the crystals are discussed. Some experiments which have been made possible through the availability of such high purity crystals are described, including some recent work on semiconductors. A brief account of atomic amplifiers using paramagnetic crystals is also given. The effect of these new developments in the application of the physics of solids on the training of electronic engineers is discussed.
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