. Canadian engineer. application, and that the influence ofone-half of this load, or 6,250 lbs., would be extendedfor a distance of three feet from its point of applicationin a diminishing amount, and that one-half of thatamount, or 3,125 lbs., would be carried by reinforcementin the first foot, one-third, or 2,085 lbs., in the secondfoot, and one-sixth, or 1,045 lbs., in the third foot,making the entire load to be carried by the reinforce-ment in a strip of floor six feet wide. In the second case, the front roll of the steam rollerwas considered. In this the entire load of 12,000 assu
. Canadian engineer. application, and that the influence ofone-half of this load, or 6,250 lbs., would be extendedfor a distance of three feet from its point of applicationin a diminishing amount, and that one-half of thatamount, or 3,125 lbs., would be carried by reinforcementin the first foot, one-third, or 2,085 lbs., in the secondfoot, and one-sixth, or 1,045 lbs., in the third foot,making the entire load to be carried by the reinforce-ment in a strip of floor six feet wide. In the second case, the front roll of the steam rollerwas considered. In this the entire load of 12,000 assumed as applied at one point but without the 25per cent, addition for impact, as it was thought that ifimpact was produced by the roll, as in passing over astone, it could be only when the roll was returned to thesurface, and the load was then automatically distributedby the roll itself. The flexible hanging of the front rollwould also assist this distribution. The assumptions for ^^ \^ oak-. ftf c o3k c f 0 0 ^ k 6\ys 03^ 0 1 distribution were as before. The greatest load in thiscase would be 3,000 lbs. per foot. In the third case, the rear rolls of the roller wereconsidered, and the assumptions as to load distributionwere the same as in the first case. The maximum loadingin this case would be 2,812 lbs. per foot. The loading used in determining the amount of rein-forcement required was 3,125 lbs, per foot applied inthe centre of the span. , 3o8 THE CANADIAN ENGINEEE Volume 30. Before the bridye was completed, the cOiiliactors{jr the paving rolled it with a tilieen-ton roller, passingit repeatedly back and forth over the bridge. The de-flection was so small as to be unnoticcable. The second problem related to the best method ofcovering the exposed sides of the two outer girders. Theyare seven feet high, and to cover them with cast con-crete was difticult unless the covering was made ratherthick. If the covering was cast thick enough to be prac
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