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. 1850 Excerpt: ...Mr. Turner was not prepared for the exhibition of such a surplus amount of strength, as had been proved to exist, under the peculiar mode of testing to which it had been subjected. After Mr. Locke had satisfied himself as to the general stability of the roof, and had made such observations as were necessary, to establish his views of the mode of strengthening certain parts, he proceeded to make further experiments, for the puposes of scientific research, and the result was the production of a roof, which Mr. Turner believed was hitherto unequalled for stability and strength, and he was so confident of the correctness of the principle, that with his present practical experience, he should not hesitate to undertake the construction of roofs of almost any extent, within the limits of the strength of the material employed, particularly if he had the advantage of the advice and supervision of Mr. Locke. In answer to a question from Captain Moorsom, Mr. Turner said, the total cost of the roof fixed and finished, including the castiron columns, and the wrought-iron box-beam, was about £15,000, or nearly £20 per square of 100 feet. Mr. Locke, M.P., V.P., said, that when he was instructed by the railway company to consider the applicability of the plan for the Lime-street station, it became his duty, before giving an opinion, to examine its construction very carefully, and to ascertain the positive strength of the structure. For this purpose he had recommended, that a portion of the proposed roof should be erected and be subjected to certain trials; accordingly three principals, composing two bays, were constructed by Mr. Turner, at his workshops, in Dublin, when the middle principal was subjected to a test of 40lbs. per superficial foot of the span, or op...