The quality of castings is governed by a great many things besides what have been named, such as the manner of gating or flowing the metal into the moulds, the temperature and quality of the iron, the temperature and character of the mouldthings which any skilled foundryman will take pleasure in explaining in answer to courteous and proper questions.
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The tall, slim pilot, grinned at the compliments and then went on working his jaws on the gum he habitually chewed.(1.) What is gained by arranging a machine to perform several different operations?(2.) What may be lost by such combination?(3.) What is the main expense attending the operation of machine tools?(4.) What kind of improvement in machine tools produces the most profitable result?(5.) What are the principal causes which have led to machine combinations.Irregularity of cooling may be the result of unequal conducting power in different parts of a mould or cores, or it may be [98] from the varying dimensions of the castings, which contain heat as their thickness, and give it off in the same ratio. As a rule, the drag or bottom side of a casting cools first, especially if a mould rests on the ground, and there is not much sand between the castings and the earth; this is a common cause of unequal cooling, especially in large flat pieces. Air being a bad conductor of heat, and the sand usually thin on the cope or top side, the result is that the top of moulds remain quite hot, while at the bottom the earth, being a good conductor, carries off the heat and cools that side first, so that the iron 'sets' first on the bottom, afterwards cooling and contracting on the top, so that castings are warped and left with inherent strains.
FORE:"Where is that knife?" Von Manteuffel asked the sergeant who had fetched my belongings.She sat with her hands folded in her lap grimly, patiently waiting for the novelist to speak. He produced a cigarette.
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The hussar who was first hit, died later on. The other appeared to be only slightly wounded in the arm.In using ruling pens, they should be held nearly vertical, leaning just enough to prevent them from catching on the paper. Beginners have a tendency to hold pens at a low angle, and drag them on their side, but this will not produce clean sharp lines, nor allow the lines to be made near enough to the edges of square blades or set squares."5. Who undertake to enter into verbal or written communication with persons in the army or the fleet, of the enemy country at war with Germany, about matters relating to the war itself.The general principles of hammer-action, so far as already explained, apply as well to hammers operated by direct steam; and a learner, in forming a conception of steam-hammers, must not fall into the common error of regarding them as machines distinct from other hammers, or as operating upon new principles. A steam-hammer is nothing more than the common hammer driven by a new medium, a hammer receiving power through the agency of steam instead of belts, shafts, and cranks. The steam-hammer in its most improved form is so perfectly adapted to fill the different conditions required in power-hammering, that there seems nothing left to be desired."Certainly, sister. Tell her that Bart of Uncle Henry is here." Again I was switched off, but the communication was this time restored after a few moments, and then I heard a joyful and surprised exclamation:Bruce murmured something. He was too dazed for the moment to speak coherently.
