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THIS specification covers the design of bridges, and is a notable addition to the matter extant upon this subject. It is interesting as there is no other generally-known specification in this country with which to compare it; and it is difficult to find any text books which cover all the points of design called for in this specification, except by having recourse to matter published abroad. The specification appears to be moulded along the lines of the Canadian and American, and to some extent the German specifications, and comparison with these is interesting.
FEW bridges in this country have attracted so much attention and study as the Old Bridge at Pontypridd. Not only is it remarkable in itself, but it is rendered more so as a structure in that at the time of its construction very little was known about the
statics of the arch. Also it was the work of a self-taught mason, named William Edwards. Born at Eglwysilian, by the time he was sixteen he was known to be the best builder of dry walls within a wide area. While engaged in enclosing a field for a farmer about two miles from Caerphilly, he saw the foundations prepared for a blacksmith’s shed, and later on the mixing of mortar, a substance hitherto unknown to him. The sight inspired him to study the practices of the mason, and being commissioned to build a house and workshop for a friend the successful achievement thereof soon led to other building operations.
Captain F.W. Rees
All available experience in experimental data shows that for slabs covering considerable areas, subjected to loading which may be concentrated over relatively small areas or for slabs which may be insufficiently supported over similar areas, bending moments are inevitably induced in the slab, producing tensile stresses in the underside of the slab, which in ordinary cases exceed those resultant from contraflexure in the upper faces.