The wel spring of sciences [electronic resource] : which teacheth the perfect vvorke and practise of arithmeticke, both in whole numbers and fractions: set foorth by Humfrey Baker Londoner. 1562. And novv once againe perused augmented, and amended in all the three parts, by the sayde authour: where-vnto he hath also added certain tables of the agreement of measures and waights of diuers places of Europe, the one with the other, as by the table following it may appeare.