Socius mercatoris: or The merchant's companion: in three parts. The first, being a plain and easie introduction to arithmetick, vulgur and decimal, the extraction of the square and cube roots, with a table of 200 square roots, and their use in the resolution of square equations. The second, a treatise of simple and compound interest and rebate, with two tables for the calculation of the value of leases or annuities, payable quarterly, the one for simple, the other compound interest, at 6 per cent. per annum, with rules for making the like for any other rate. The third, a new and exact way of measuring solids in the form of a prismoid and cylindroid, with the frustums of pyramids and of a cone: whereunto is added, some practical rules and examples for cask-gauging. By John Mayne, philo-accomptant.

Abstract

"A short treatise of simple & compound interest" and "Stereometry" have separate title pages dated 1673; "A new way of gauging the frustum of a pyramid or conical tunn" and "Some practical rules & examples for cask-gauging" have half titles; register and pagination are continuous. Errata on recto of final leaf. Reproduction of the original in the Bodleian Library.