Page:Professional papers on Indian Engineering (second series).djvu/18

2 CANNING COLLEGE, LUCKNOW. and two rooms 23" x 24 one for European Professors, the other for a class room; on the north side of the central corridor, there are seven class rooms, two 29}' 351', one 29' 1" x 353', and four 25' 59" x 35 : there are also two corner rooms 11' x 11', and two 13' X 13', and two small octagonal rooms in the front towers.

Ground was first broken in October 1876, and the work entirely completed in November 1878.

The soil on which the building stands was found to consist of some two feet of rubbish, the remains of the former old buildings, and below that of sand; the foundations throughout the building are carried down to a depth of 8 feet, the lower 7 feet consists of concrete composed of 65 parts of brick ballast, 21 parts of surkhi and 14 parts of kankar lime; the lime for this and the whole of the work being burnt on the spot; the concrete after being thoroughly mixed on a platform was spread in 6 inch layers and rammed with ordinary iron rammers till quite hard. The upper one foot is of 1st class brickwork, this and the brickwork throughout the building, except in inner cross walls, where 2nd class bricks were used, is of 1st class bricks set in English bond, in mortar composed of equal parts of fresh kankar lime and surkhi.

The plinth is 41 feet high, and inverts are given under the arches of the Examination Hall to equalize the pressure on the foundations; this provision was not made in the design. On the top of plinth a damp course of asphalte z-inch thick was laid.

The superstructure, which with the exceptions hereafter mentioned, is entirely of brickwork, was carried up evenly throughout the whole build- ing and kept thoroughly wet until completed.

The roofs of upper and lower verandabs and corridors are not made as in original design, but consist of segmental arches of 9 feet span and 21 feet versine; the span of arch is made less than width of verandah by bringing the arch forward on to the cornice, the arches are 9 inches thick, and the spandrels up to level of extrados are filled in with concrete com- posed as for foundations, the thrust of the arch is taken by wrought-iron bars each 3" x 3" tied together at 8 feet intervals by bolts 1 inch diameter.

The roofs of Library and all rooms, except Examination Hall and turrets, are of brick arches turned between girders, the arches are 41 inches thick at crown, and 9 inches at the haunches, the spandrels up to level of tops of girders are filled in with concrete composed as for foundations,