Wallace's book of interest, [electronic resource] : compiled for the use and assistance of the merchant, banker, and all other persons concerned in interest accounts, on a principle entirely different from any book of the kind hitherto published: with an introductory address, Proving that all the present Interest Books have calculated the Interest less than the true Amount, to the Constant annual Loss of such Merchants, Bankers, &c. Of Great Britain and Ireland, who use them in their Counting-Houses: the whole supported, and clearly demonstrated, by various arithmetic calculations. By W. Wallace, ship and commercial accountant.