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As he reached for the letter, and searched on the fourth page, all three of his listeners were holding their breath in suspense.

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It was a puzzling one, too. Every policeman who had been on night duty in Lytton Avenue for months was closely examined. Once or twice a night the doors of the house had been tried without effect. Nobody had ever been seen to come away or enter. No suspicious characters had been seen loafing about. Not one of the officers had ever seen a light in the place.
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(1.) Why cannot the regular working drawings of a machine be employed to construct patterns by?(2.) What should determine the quality or durability of patterns?(3.) How can the arrangement of patterns affect certain parts of a casting?(4.) What means can be employed to avoid inherent strain in castings?(5.) Why is the top of a casting less sound than the bottom or drag side?(6.) What are cores employed for?(7.) What is meant by venting a mould?(8.) Explain the difference between green and dry sand mouldings.(9.) Why is sand employed for moulds?(10.) What generally causes the disarrangement of cores in casting?(11.) Why are castings often sprung or crooked?(12.) What should determine the amount of draught given to patterns?(13.) What are the means generally adopted to avoid cooling strains in castings?A scraping of a match, a flood of light again, a queer half-amused smile on the Spaniard's face, as she noted Bruce's expression. Then the front door was opened, and he was bowed out politely. Before he had time to cross the road the light was out again, and the whole house in darkness.Only now did I hear what had happened to the village of Lanaeken after I had seen the German preparations in Tongres for action against the little Belgian army that was still about in the north-eastern part of the country. The greater part of Lanaeken had been destroyed by shelling, and of course a great many innocent victims had fallen in consequence.Here I also saw in action one of the 30?5 cm. Austrian howitzers mentioned before. The clumsy204 monster was constantly being shunted on a rail forward and backward, and at long intervals sent a gigantic projectile to the threatened quarters. The sound was terrific, and the pressure of the air made people at a great distance tremble on the ground. The Austrian artillerists were still equipped as if they had to fight in a rough, mountainous country; the soles of their shoes were all over covered with hobnails.
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