Abstract
The cryostat in which the liquid helium level has to be maintained is connected to a liquid helium storage dewar by a siphon. When the helium level in the cryostat which is controlled by the level device falls below a given height, the device produces a signal which operates a small wing pump. This pump~provides a pressure drop o f ~ 1 0 torr (1 torr = 133 N m z) between the helium storage dewar and the return line to the gas holder and liquid helium then flows under this pressure from the dewar to the cryostat. The device provides another signal, turning off the pump, when the liquid helium level in the cryostat reaches the upper control level. In the intervals between fillings, for conserving it, the helium evaporating from the dewar enters the return line through gaps between the rotor and case of the pump.
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