Gauging, the operation of measuring the capacity of any receptacle, as for example that of a cask, barrel, or vat. It may be performed either by measuring the dimensions of the receptacle and then calculating its capacity upon geometrical principles, or, without the necessity of any calculation, by means of a gauging rod suitably adjusted for the purpose. Though the contents of a vessel cannot ordinarily be ascertained in practice with absolute accuracy by these methods, the art is of service in the collection of excise duties, inasmuch as the contents of a vessel are ascertained by means of it without being disturbed.- See Symons's "Practical Ganger,"Leadbetters "Treatise on Gauging," Hutton's "Mensuration," etc.