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时间: 2019年12月15日 01:04

Here was the antithesis of the Wolseley type in the matter of bore in relation to stroke; from about 1907 up to the beginning of the war, and even later, there was controversy as to which type鈥攖hat in which the bore exceeded the stroke, or vice versa鈥攇ave greater efficiency. The short-stroke enthusiasts pointed to the high piston speed of the long-stroke type, while those who favoured the latter design contended that full power could not be obtained from each explosion in the short-stroke type of cylinder. It is now generally conceded that the long-stroke engine yields higher efficiency, and in addition to this, so far as car engines are concerned, the method of rating horse-power in relation to bore411 without taking stroke into account has given the long-stroke engine an advantage, actual horse-power with a long stroke engine being in excess of the nominal rating. This may have had some influence on aero engine design, but, however this may have been, the long-stroke engine has gradually come to favour, and its rival has taken second place. An important development in connection with the inspection and testing of aircraft parts, particularly in the case of metal, was the experimental application of X-ray photography, which showed up latent defects, both in the material and in manufacture, which would otherwise have passed unnoticed. This method was also used to test the penetration of glue into the wood on each side of joints, so giving a measure of the strength;312 and for the effect of 鈥榙oping鈥?the wings, dope being a film (of cellulose acetate dissolved in acetone with other chemicals) applied to the covering of wings and bodies to render the linen taut and weatherproof, besides giving it a smooth surface for the lessening of 鈥榮kin friction鈥?when passing rapidly through the air. � Long years after, when old and wellnigh worn out with her Indian campaign, she wrote鈥? 鈥楬. St. George Tucker, Esq., etc.鈥? � 久久热在线视频观看_久久热精品视频_久久热最新地址_久久热在线精品 � Some such thoughts as Lydia's probably passed through the minds of the Misses McDougall, but, of course, that was not the time or place to express them. They exerted themselves to entertain their hostess with a variety of Whitford gossip, while Castalia鈥攈er attention divided between the purse she was making and the drawing-room door, at which she hoped to see her husband presently appear鈥攎erely threw in a languid interjection now and then as her contribution to the conversation. A shudder ran through the audience. The preacher seemed to hold them in a spell. No voice was raised to interrupt him. Many persons turned pale as they listened. But on one face in the crowd the colour faintly dawned again. In one breast the preacher's voice giving utterance to the awful and glowing imagery of the Hebrew of old time, awoke something like a sensation of relief and comfort. Algernon Errington felt the life-blood pulsing warmly again in his veins. This Methodist man was mad鈥攃learly mad! What was his testimony worth? Rhoda looked up at him in genuine surprise; but her eyes fell before the answering look they encountered, and she blushed from brow to chin. 鈥楥. M. T.鈥?