Everywhere there is a Cantar or Quintal, a hundredweight, divided into 4 rūba and into 100 pounds or rotl.
In Tunis the Cantar = 111 lb., divided into 100 rotl of 16 ukyé or ounces of 10 dirhems.
In Tripoli it is = 107·6 lb., in 100 rotl of 16 ukyé, of 8 dirhems of 47·075 grains.
In Morocco it is = 112 lb. of 100 rotl, each of 20 ukyé of 8 dirhems; the ukyé or ounce = 392 grains as in Gascony (Foix, Albi, &c.), where it was 8 ternau.
SUMMARY
However differently the Mediterranean pound or the rotl may be divided, its ukyé or ounce is always based on one of the dirhems. This dirhem-basis is found in every pound used in Europe and the countries colonised from Europe.
The pound, whether of 12 or 16 ounces, found in Morocco, Majorca, Sardinia, Gascony, is then an Arabic weight, with an ounce of 8 dirhems, of 49 grains = 392 grains.
The pound of Provence was 16 ounces, each 8 dirhems of 47·1 grains.
The Troy pounds had ounces of 10 dirhems varying between 47·2 grains for French Troy and 48·3 for northern Troy.
The Spanish pound = 7101 grains, its ounce = 443·8 grains, was originally at the Moorish standard of 6 mithkals to the ounce, that is the Egypto-Roman ounce, the old averdepois ounce. But 6 mithkals being equal to 9 lesser dirhems, this dirhem-basis appears to have been taken. Then, for lesser dirhems of 48·5 grains, 9 heavier dirhems of 49·3 grains, nearly the Morocco and Gascony standard, were substituted.