The practical gager: or, The young gager's assistant : Containing those things which are actually practised, and which are absolutely necessary to be known and understood by every person that is employed as a gager or officer in the revenue of excise. To which are added, all the necessary tables for gaging and sixing the utensils of victuallers, common brewers, and distillers: also for moneying the several sotts of goods, or for finding the amounts of the charges. Very useful for supervisors, officers, and collectors clerks. The fourth edition. With an appendix; containing several additions, viz. The method of gaging by equdistant ordinates; inching and tabulating of close casks; and specimens of vouchers and abstracts for the several duties. Dedicated (by permission) to the Honourable Commissioners of Excise. By William Symons, collector of excise.