. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 2. F!g. 3 also adopted a tentative process. Moseley's line of resistance touched the intrados and extrados at the points of rupture. Now a practical eye could detect very closely which would be the point of rupture, and a curve of equal horizontal thrust drawn through these points, though it might not produce the line of resistance with mathematical accuracy, was sufliciently near it for all useful purposes. Moseley's theory was undoubtedly very perfect; in fact he was t
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 2. F!g. 3 also adopted a tentative process. Moseley's line of resistance touched the intrados and extrados at the points of rupture. Now a practical eye could detect very closely which would be the point of rupture, and a curve of equal horizontal thrust drawn through these points, though it might not produce the line of resistance with mathematical accuracy, was sufliciently near it for all useful purposes. Moseley's theory was undoubtedly very perfect; in fact he was the only mathematician wlio had treated the sub- ject consistently with its practical requirements. The dilficulty in his mode of investigation was in those arches which did not partake of regular geometric forms, and in these cases Mr. Barlow's method would be found easy of application. Mr. Brusel still thought, that Mr. Barlow had scarcely met the objec- tions which had been raised. It was true that in practice some points might be assumed; but it was more satisfactory to have positive rules for finding these points, and assuring the mind as to the correctness of the basis of the proposition. In a very large arch, with a small rise, the line of pressure must be confined within very narrow limits, and in such a case a formula giving the points definitively was essential for inspiring confidence. Mr. W. H. Barlow replied, that the limits %Thich confined the line of resistance, depended on the thickness of the arch and not on the ratio of the rise to the span ; the points of rupture in ordinary forms of arches were well known; they were at the extrados in the crown, and at the intrados in the haunches; there was, therefore, no difficulty in finding the line of resistance in these cases. If the mind was as perfectly impressed with the direction of the forces in arches, as in the case of columns, both could be built with equal security. Mr. G. Snell stated, that in all cases of equ
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