![](https://coimages.sciencemuseumgroup.org.uk/5/266/medium_thumbnail_1925_0800.jpg)
c.1697 - George Brown invents the ‘rotula arithmetica’, which he argues would ‘teach those of very ordinary capacity who can but read figures, to Add, Subtract, multiply and divide...'.
c.1697 - George Brown invents the ‘rotula arithmetica’, which he argues would ‘teach those of very ordinary capacity who can but read figures, to Add, Subtract, multiply and divide...'.