The
Mensa Ponderaria, or rather
the Weights and Measures Office,
is situated in the immediate neighborhood of the fruit and vegetable
market. It contains a table with the legal measures of weights and
volumes.
The
municipality established it so as to impede arbitrary measurements by
the merchants. In the large limestone slab there are nine
circular cavities, each of which corresponds to a measure. An opening
at the bottom allowed the weighed merchandise to fall out. Themensa predates the foundation of the colony and since Oscan
measures do not correspond to Roman ones, in 20
B.C. a commission conformed the cavities to the new units of
measures.