PIRA 1A10.30 Basic Units: Standard of Length
Instructions / Notes:
- The one meter bar has been compared with the National Bureau of
Standards of the United States.
- The length of the bar from zero to the
one meter line at 20 deg C is 1000.068 millimeters.
- The value for the length of the bar at 20 deg C is not in
error by more than 0.002 mm.
- Maker of bar: Societe Genevoise.
- Date bar was tested and calibrated: November 9, 1938.