A rough method of finding the breaking strength of manila, hemp or sisal cordage is to square its circumference (in inches) and divide by 3, the answer being in tons.
Indlela nje yokushwankathela ukufumana awona mandla entambo ye-manila, ye-hemp okanye ye-sisal kukusikwerisha isazinge sentambo (ngokwe-intshi) uze ulahlule ngesi-3, isiphumo sibe kwitoni.