Abstract
The use of the sensitive McLeod gauge is limited by its fragility, bulk, and lack of portability. A new type of McLeod gauge is described which greatly reduces these difficulties. A helix of several turns of glass tubing provides the volume through which the gas is compressed by a small quantity of mercury as the gauge is rotated upon its rotary seal. A model has been constructed which is 16×16×21 cm in over-all dimensions and weighs less than 1 kg. Its gauge constant with a 0.8 mm capillary is 1.4×10−6 mm−1.
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