From some known examples, C varies from 1500 to 1800 for iron braced parallel or bowstring girders, and from 1200 to 1500 for similar girders of steel.
For parabolic or bowstring girders, when r =8, the limiting span is 1280 ft.
The next year, however, Toghrul Beg got rid of both his antagonists, Ibrahim being taken prisoner and strangled with the bowstring, while Basasiri fell in battle.
Bowstring put an end to his life (1073).
Fle and his brother were seized and put to death, the instrument used being, according to Watson, the bowstring of Eastern story.