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The following simple problem in Graphic Statics is sfbpplied by The Bennett College, Sheffield, the Governor of which will give a prize of 10s. for the best solution. In allotting points, neatness will receive the same consideration as accuracy.
0NE of the problems of civilisation to-day is the prevention of waste, and most countries of the world, if they adopted scientific methods, could live on what they throw away. One good example of this is the fact that millions of tons of ash and clinker, from steam boiler, destructor and other furnaces, for example, together with blast furnace slag, are wasted every year, whereas all this material could be converted, at a handsome profit, into high grade bricks.
With the gradual raising of concrete engineering into a definite branch of science, the need for accuracy in every detail and, therefore, for testing at each successive step, has brought about the introduction of quite a large number of appliances used in controlling operations. Such checking of operations is required not only in connection with the primary materials-cement, sand, the larger aggregates and water-but the secondary adjuncts, including reinforcements, waterproofing or other ingredients, and also the mixtures at various stages, as well as the completed work, whether this be in the form of mass construction or moulded units.