. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 334 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [October, plained by the were for 15 feet bearings, 12 in. deep in tlie centre, and 8 in. at tlie ends, and 1J in. thick in the centre; the forked or divided parts were each U tl"'^k, and the roll at the top 2i in. diameter. They were proved to 20 tons by 13 tons in the centre, although there is not a probability of their having to carry 9 tons, but the object was to give confidence to the public; the deflexion was
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 334 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [October, plained by the were for 15 feet bearings, 12 in. deep in tlie centre, and 8 in. at tlie ends, and 1J in. thick in the centre; the forked or divided parts were each U tl"'^k, and the roll at the top 2i in. diameter. They were proved to 20 tons by 13 tons in the centre, although there is not a probability of their having to carry 9 tons, but the object was to give confidence to the public; the deflexion was an inch. The skew-backs were cast hollow, having stiffening pieces about 3 ft. apart, as shown by the plan and section. Between the girders arches were turned in half a brick in cement, care being taken in setting out the work to bring in the courses with very close joints, and so as for the bricks to touch each other at the lower side ; the 5 or G centre courses were put in without cement, so as to get jammed in tight, after which they were grouted. The rise of the arch was 5 inches, the spandrils were not filled in, and the bricks were well snaked in water. The centreing was in all cases held up or suspended to the girders by iron hangers, whereby the weight was gradually placed upon it; this would not have been the case if the centreing had been put up on props and afterwards struck in the common way. About 22,000 feet of these arches have been turned, and not the slightest appearance of a settlement is to be found in any part of them. The floors over the arches are formed in the usual manner, with joists and sleepers. The iiitrados are plastered, and a soffit with papier mache work is fixed to the underside of the girders to conceal them. The reliance to be placed on this method of building as a security against the extension of fire from room to room, has been fully tested in the following manner; a large coke fire was made in the centre of each room on the basement floor
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