A dictionary of architecture and building : biographical, historical, and descriptive . ngth 1360 of being rigidly fixed to the foundationsit was connected to them by hinged joints, andthe two halves of tlie arch met iu a hingedjoint in the centre of the crown. At the timeof its construction it was by far the largestarched roof existing. It has been exceeded afew feet by the roof of one of the buildings ofthe Chicago Exposition, imitated from it. Itis constructed entirely of wrought iron, latticedbetween the two flanges. The immense ribsare 70 to 80 feet apart, and are connected b
A dictionary of architecture and building : biographical, historical, and descriptive . ngth 1360 of being rigidly fixed to the foundationsit was connected to them by hinged joints, andthe two halves of tlie arch met iu a hingedjoint in the centre of the crown. At the timeof its construction it was by far the largestarched roof existing. It has been exceeded afew feet by the roof of one of the buildings ofthe Chicago Exposition, imitated from it. Itis constructed entirely of wrought iron, latticedbetween the two flanges. The immense ribsare 70 to 80 feet apart, and are connected bylatticed beams or purlins. The arches are about13 feet deep near the ground. The work was let to two contractors whoadopted ditterent methods of erection. One ofthem put first in place the heavier lower halfof the rib, the foot as it was called, weighingforty-eight tons ; then the upper part of thirty-eight tons was raised to its position. The otherhalf had meantime been put in place, and theribs met at the toji after five hours work ofeighty men. The other contractor built mov-512. IRON CONSTRUCTION: CHURCH OF S. AUGUSTIN, PARIS. The iron work, iucluding vault ribs and vaulting shafts, is visible, and vaults and domes of hollow brick;the whole made ornamental with painted decoration. 513 614 IRON CONSTRUCTION able seaftbkliiig for the suiijiort of the ribs,which were handled and put in place in smallparts, not exceeding three tons in weigiit. The vestibule to the building is covered by adome about 100 feet in diameter, of iron, andcovered with glass. The Eiffel Tower is too well known to requiredescription. Its novelty was perhai^s its prin-cipal attraction. Its heiglit was 984 feet. Hap-pily, the intention to build a somewhat similartower, 1000 feet in heiglit, at Chicago, in 1890,was abandoned. The latest phase of metallic construction isthe steel skeleton structure. Tiie steel columnsand girders make the frame of the building,and must be in themselves and in their connec-t
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