Dr. Steve Rapp, 2005
Evolution of the Definition of Meter
1793- The meter was first defined by dividing
the length from the north pole to the equator
measured along a great circle passing
through the poles into ten million parts.
The meter was reproduced in metallic bars.
It was found, however, at a later time that
the bar lengths did not correspond exactly to
the original definition.
So, the original definition was abandoned.