Trescal : Here is the new name of Air Liquide Calibration Service Business
This name carries our symbols :
 The
measurement field (CAL like Calibration and SCAL like Scale)
The
"TRESCA section" from the French scientist Henri TRESCA who designed
the reference
prototype of the standard length
The
measurement interval by using < (lower than) and > (greater than) to represent
the S.
The "Commission of Meter" defined in 1872 a new prototype for the standard length.
It was a bar of a modified X cross section shape
with a length of 102 cm on which two lines were
engraved, the distance between the lines defining the standard length. This bar
was designed by the French scientist Henri TRESCA (1814-1885).
About 30 line standards were used across the world as a primary reference standard
for length until 1960
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