WHEN the bow weighs seventy rotls, its appropriate string should weigh three or three and a half dirhams; when its weight is sixty rotls, the string should weigh two or two and a half dirhams; when its weight is thirty rotls, the string should weigh One or one and a half dirhams. All these specifications are according to the Khurasanian school.

Others among the Persians maintain that when the bow weighs One hundred and fifty rotls, the string should weigh four dirhams; when it weighs eighty rotls, the string should weigh three dirhams; when it weighs seventy rotls, the string should, likewise, weigh three dirhams.

Some archers have maintained that when the bow weighs seventy rotls, the string should weigh from three or three and a half to four dirhams. The same thing is true when the bow weighs eighty Or ninety rotls. When the bow weighs one hundred rotls, the string should weigh four and a half dirhams; when it weighs One hundred and fifty rotls, the string should weigh from four and a half to five dirhams; when it weighs two hundred rotls, the string should weigh from five Or six to eight dirhams. This we have tried Ourselves and found to be good.

In the case Of the string Of the competition bow: when the bow weighs One hundred rotls, the string should weigh from two to three dirhams; if the bow weighs less, the decrease in the weight Of the string should be proportional.[52]