Engraving of the 'famous mathematician' Francois Barreme (1640-1703). This portrait includes calculations of the exchange rates between various different European currencies of the time, including English, Dutch, Italian and French. Barreme, born in Lyons, founded a commercial school in Paris and published many different types of tables and ready-reckoners during his lifetime. These were so popular that the name Barreme became a synonym for such tables.
© Science Museum / Science & Society Picture Library