In Spain, tonnage of a ship
was measured in toneles, and defined in the middle 16th century
by one of two formulas.
1 tonel was the equivalent of 8 cubic
codos or 2 pipas of
wine.
Seville:
Codo
Castellano = 32 dedos = 557 mm
Basque
Country: Codo Cantabrico = 33 dedos = 575 mm
1
tonel
macho = 8 Codos Cantabricos
1
tonelada
de carga = 8 Codos castellanos
1 tonelada was an
unit of account obtained by adding 20% or 25% to the
cargo capacity of a ship in toneles.