The new London method of arithmetick. Containing Plainer and shorter Rules for Decypherine than any ever yet Published. with an appendix, shewing how to keep a book of houshold expences; necessary for all Families. There is also added, (which was never published before) the rule how to multiply several figures by several, the Produce of which shall be in one Line only. By John Halliday, A.M.
Halliday, John, A.M. | Date: MDCCXLIX. [1749]