Abstract
This note describes a system for the provision of a working `atmosphere' in a commercially available glove-box. Air is pumped out of the box, chilled, passed through a column of cooled molecular sieve, and returned to the box. The air-lock of the box can be treated separately allowing the removal and introduction of equipment while maintaining dry conditions in the main compartment. Pressure in the box is controlled by foot switches operating electromagnetic valves. A device for the measurement of frost-point is described by means of which it has been shown that the frost-point of the air in the box is less than -90°C, corresponding to a moisture content of 10-4 mg 1-1 (approximately 0.1 p.p.m.). Transfer of items from the laboratory to the working chamber is simple and rapid, the air-lock requiring about 15 minutes for operation.
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