Correction
Sorry I made a mistake when I said one angula/finger was four or five barley corns, as it seems to be eight barley corns.
Wheeler M. Thackston in Jahangirnama writes that one finger is 2.032 cm or 4/5 inch.
A. L. Basham in The Wonder that was India writes that eight barley corns = one angula = 3/4 inch.
If Thackston is correct. 1 inch = 2.54 cm so 4/5 of an inch would be 2.032 cm.
Basham's measure would give 1.905 cm. So the difference would be 0.127 cm.
When we are told that the best blades should be 50 angulas - and always an even number - the difference in blade length would be 6.35 cm, which is 3.125 angulas in difference.
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