Abstract
SIX years ago Foster et al., of the California Radiation Laboratory, constructed a high-vacuum pump with high pumping speed (3,000–7,000 litres/sec.) based on the principle of transport of ions during a discharge in a magnetic field1. The limiting pressure reached was less than 1 × 10−6 mm. mercury and the residual gases were free of hydrocarbon vapour. This pump at first caused much interest, but was soon forgotten in favour of more economic pumps based on the pumping effect of evaporated titanium2.
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