The application of a new portable scale, (being the first of this nature) in resolving questions in the following particulars : viz. Interest, for any sum, time or rate. Discount, of bills, tallies, stock, &c. Factoridge brokeridge commission exchange, &c. at all rates. Value of any quantity of goods, merchandize, or any fractional part of an intiger. Of any number of pistols, dollers, or other foreign coin. Of wages due to any workmen or seamen, for any time or rate: as also short allowance. Number, of days in any distance of time. Proportion, of any sum per annum, to one or any number of dayes. And several other profitable uses. The second edition, with additions. Invented by Tho. Wastell.