Engineering magazines from the time noted that the eleven 160-foot pre-cast arches used in the building s construction were a record-breaking span for pre-cast arch ribs used in the United States.
22.
He had already built a bowstring or tied arch bridge at Windsor ( 1849 ) consisting of three triangular cross-section cellular arch ribs " strung " by wrought iron deck girders supported by vertical hangers from the arches.
23.
It was one of a series of concrete arch bridges built for the Queensland railways between 1900 and 1913 and is unusual in construction for an Australian bridge, having separate twin parabolic arch ribs and braced concrete spandrel columns.
24.
Traditional masonry was rejected in favour of rivetted wrought iron elliptical arches, the largest of which spans 114 ft . The arch ribs are masked by cast iron spandrels adorned with the Royal coat of arms, the coat of arms of Prince Albert and those of various corporate bodies.
25.
Before entering into the question of the web or stone shell of the vault carried on the ribs, the earlier development of the great vaults which were thrown over the naves of a cathedral, or church, before the introduction of the pointed arch rib, shall here be noted.
26.
The cast iron arch ribs are 3 ft 6in deep at the crown, increasing to 3 ft 9in at the springing, with 12 inch flanges; the flanges and webs were three inches thick; in the case of the inner ribs, and two inches for the outer ribs.
