Abstract
The term vacuum plumbing is intended to express briefly the mass of technique which has recently been developed by which vacua from 10^(-4) to 10^(-6) mm Hg or better are obtained in systems mainly of metal and of large volume. The large high voltage x-ray tubes and ion accelerating tubes of C. C. Lauritsen at the California Institute of Technology, E. O. Lawrence at Berkeley and Merle Tuve at the Bureau of Terrestrial Magnetism are three examples of such systems.
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