ly through the cen- feet long were opened, and in them I-beams seven in Niagara has a world-wide reputation for its famous ter and building the new steel work into place. The number were placed. Each of the I-beams weighs bridges. More than one notable suspension bridge has new truss is three times… … The center truss was then built CENTER TRUSS. COLUMNS. out over the river, the various posts, ties, etc., being lowered given way to the more modern steel.arch, in order to into place from the floor of the bridge by means of bridge it was found necessary to cut 2 feet 2 inches meet the requirements…
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