Abstract
J. and E. Hall, Ltd., of Dartford, Kent, have recently produced, for research purposes, a fully automatic low-temperature cabinet which can run at a temperature of −95° C. The manufacturers believe this to be the only plant available of this type, developed and manufactured entirely in Great Britain. The unit has been produced almost exclusively from normal standard equipment. Refrigeration is accomplished by the use of two small ‘Hallmark’ refrigerating compressors of conventional standard design which are arranged to run in cascade, suitable refrigerants being chosen for the high and low stages. The cooled cabinet consists of a cylindrical metal vessel, 19½ in. internal diameter by 36 in. high. The whole equipment is arranged on a chassis which can be easily moved from one laboratory to another, the only services required being electricity and water. Safety precautions are such that whether the plant is switched off, the current interrupted involuntarily, or the water supply interrupted, it is not possible for dangerously high pressures to develop in any part of the system.
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A Fully Automatic Low-Temperature Cabinet. Nature 160, 359–360 (1947). https://doi.org/10.1038/160359d0
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DOI: https://doi.org/10.1038/160359d0