This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 Excerpt: ...that the tubes for the Britannia and Conway Bridges follow the same law, as regards their powers of resistance to a tensile strain, the inference would be, in reasoning from the one to the other, that the large tubes, as now laid down, are amply sufficient to resist not only their own weights, and the heaviest loads ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 Excerpt: ...that the tubes for the Britannia and Conway Bridges follow the same law, as regards their powers of resistance to a tensile strain, the inference would be, in reasoning from the one to the other, that the large tubes, as now laid down, are amply sufficient to resist not only their own weights, and the heaviest loads that can be placed upon them, but also the external force of the wind under whatever conditions it may act upon them. If we revert to the last experiment but one (October 16th), it will be found, that the plates which composed the bottom of the tube were of inferior quality, and consequently they gave way by tearing asunder with a weight of 66 tons. Since that time, the bottom has been increased by a superior quality of new plates, raising the sectional area of that part from 17-8 to 22-4 inches. These plates have however only been extended to a distance of 21 feet on each side of the centre; and, consequently, See experiments in the Appendix. from that point to the end of the tube, the bottom has undergone no change, but continued with the original plates of 8-8 inches area. It is to be regretted that one of them had not extended a few feet further, as it would have equalized the bottom, and considerably increased the bearing powers of the tube; had this been done, instead of breaking with 69 tons, it is more than probable that 80 tons would have been the nearest approach to its maximum strength. But be this as it may, I should consider myself safe, in estimating the breaking weight of a well-proportioned tube of this description at 75 tons; and taking into consideration the same strain already sustained at this point of the tube, and its tortured condition in other respects, I am clearly of opinion that 75 tons is rather within than beyond its...
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