Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
..Charles LaCondamine
& Peru and Pierre Maupertuis
..Jean Charles
de Borda
..Charles-Edouard
Guillaume
..John Harrison
..Great Britain
..Julius Caesar
..Greenwich
..The compass
..Instruments
and measurements