Show A nation of bridge builders the united states la Is notably in advance ot of all other nations in the science and practice ot of bridge building the increasing demands demanda of commerce justified longer and longer spans the weight of locomotives and trains doubled and trebled the single bridge members increased to one hundred feet lit in length and one hundred tous toua weight wonderful steam hydraulic dr aulle pneumatic and electric machino machine tools to fashion them with and costly special shops were built in this country and operated by thousands of men the methods and facilities ot of erection have kept pace with these developments enormous derricks traveling towers and steel rope tackles operated eight at a timp time by a single steam or electric lio hoisting violating lating eti engine gine with many other costly special appliances have be been aen provided for assembling tho the great members quickly cheaply and safely into the finished span america stands today to day far in advance of all the world in tho the daring designs high quality and economical e and rapid con construction st ruction 0 ot f many great bridges F P W skinner in harpers weekly |