IN recent years great advances have been made in the use of electronic devices in industries outside the sphere of ‘communications’. Mr. Henney's book should do much to further the advance. The author ...

For decades, the speed of transistors has been approaching its physical limit. Now, researchers have built a new type of vacuum/air channel electron tube that completely eliminates a fatal flaw that ...

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A SEALED-OFF cathode ray tube for demonstration of electron diffraction patterns at low voltages (6,000–7,000 volts) has already been described by me 1. We have recently carried out experiments with ...