The Rottolo, = 98 lb., is 144 dirhems of 47·66 grs.
The Oka is a centesimal multiple of the dirhem.
The Rottolo is an uncial multiple of it.
100 Rottoli = 1 Cantar = 98 lb.; this is the modern Egyptian Cwt. which has succeeded the Cantar of Al-Mamūn = 102·92 lb.
Turkey
There is a double series as in Egypt, but the Turkish series are based, one on the Dirhem and the other on the Egypto-Roman ounce at the standard of 436·45 grains. In modern Rome it is 436·26 grains, in Tuscany 436·66 grains.
The Dirhem, = 49·5 grains, is 16 qirát of 3·1 grains.
The Cheké is of 100 dirhems = 4950 grains.
The Oka is of 400 dirhems = 2·83 lb.
The Cantar is = 2000 ounces = 124·7 or 44 Oke.