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A meetinf of the Institution was held at Denison House, Vauxhall Bridge Road, London, S. W., on Thursday, February 21, 1924, when a paper on “Column Fallacies” was read by Dr. E. H. Salmon, D.Sc.
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
The Acme Stone Breaker
This machine is well known amongst councils, quarry owners and, in fact, all users of stone-crushers, and, as is generally well known, is a departure from the stereotyped form of Blake crusher, which is supplied by all other first-class makers of such machines. The special nature of this machine is the combination in one part of the two chief moving parts of the Blake type of stonebreaker, thus obtaining a direct action and increased weight and momentum of the operating part which affects the breaking of the stone. The direct action of the machine eliminates unnecessary mechanical complications of levers, toggle plates, connecting rods of the Blake type of power consumption. The direct action results in a sharp crusher, and thereby resulting in economy in upkeep costs and hammer-like blow at the top of the swing jaw where the large pieces of stone are encountered, while there is a secondary finishing and clearing below at the bottom of the mouth, and under equal conditions, than from any other machine on the abling the machine to deal with a larger output, size for site market. The largest movement is at the top of the mouth, where the stone enters the machine, and this enables maximum sizes of stone to be fed into the mouth. In the Blake type of crusher, as made by all other manufacturers, there is very little movement at the top of the mouth, and a simple backward and forward swinging motion at the bottom of the jaws.