The practical gauger: being a summary of what is necessary to be understood by all pretenders to that art [electronic resource] : Wherein the nature of such superficies and solids as are usually the subject of gauging are fully discuss'd. With the methods of finding their area's or solidities, either whole or in part: perform'd by the pen and sliding-rule. To which is added, many useful tables proper for such a work, never before printed. Publish'd with the approbation of the Honourable Commissioners of Excise, By Philip Bamford, collector of excise.