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Sir,-After reading Mr. Lloyd’s valuable paper and noting the extreme care with which the tests are conducted, it is a little disappointing to find that in common with other investigators he gets some freak results such as 10 of series 3, Table No. 6. The relatively high values of 11 and 12 of Series No. 4, Table No. 5, seem to go with relatively high weights of the blocks, but the low value of 7 Series 1 Table No. 5 also goes with a relatively high weight, so that it does not appear that an explanation can be sought in the density of the blocks.
An interesting work of construction is here illustrated in the viaduct at Cray for the Breconshire County Council on the Senny-bridge - Ystradgyn-tais Road. Owing to circumstances the construction had to be carried out as economically as possible, and the cross bracing was arranged to support temporary stagings at convenient heights so that no independent scaffolding was necessary.
In our own times we have seen remarkable developments in structural practice, in fact we may reasonably affirm that in the present we have a period of great achievement in such matters. The nearness of these events, however, tends to hinder the right assessment of their actual value, producing in some an exaggerated notion of their slgnificance and in others an indifference to their great claims, and it is very important that we should know something of the manner in which great periods of development are prepared and finally spring to life; especially if we are to obtain undistorted views of the present and, possibly, some guidance as to the part which we may play in the preparation of other and yet greater achievements in the future, the nature of which can at present be foreshadowed only with difficulty and with hesitation.
J. Leask Manson