Arithmetick and measurement [electronic resource] : improv'd by examples and plain demonstrations: wherein are laid down the different customary perches, and other measures, used in the several Parts of Great-Britain and Ireland. Suitable to all Artists; But more especially those who are employed in Building, Gardening, Surveying Land, &c. To which is added, The Use of an Instrument call'd a Tangent Rule, for the taking any given Distance within a Quarter of a Mile. Revised, corrected, and improved, by William Davidson, Architect and Land Surveyor.