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时间: 2019年12月06日 22:36

The first commercially successful engine operating on the two-stroke cycle was invented by Mr Dugald Clerk, who in 1881 proved the design feasible. As is more or less generally understood, the exhaust gases448 of this engine are discharged from the cylinder during the time that the piston is passing the inner dead centre, and the compression, combustion, and expansion of the charge take place in similar manner to that of the four-stroke cycle engine. The exhaust period is usually controlled by the piston overrunning ports in the cylinder at the end of its working stroke, these ports communicating direct with the outer air鈥攖he complication of an exhaust valve is thus obviated; immediately after the escape of the exhaust gases, charging of the cylinder occurs, and the fresh gas may be introduced either through a valve in the cylinder head or through ports situated diametrically opposite to the exhaust ports. The continuation of the outward stroke of the piston, after the exhaust ports have been closed, compresses the charge into the combustion chamber of the cylinder, and the ignition of the mixture produces a recurrence of the working stroke. At times I thought it occasioned by the lurking fear of betrayal. There was no Vigilance Committee at the time,鈥攖here were but anti-slavery men. I came North with my counsels in my own cautious breast. I married a wife, and did not tell her I was a fugitive. None of my friends knew it. I knew not the means of safety, and hence I was constantly in fear of meeting with some one who would betray me. SCENE I. You've tried your best to make me. The blending of fact and fancy which men call legend reached its fullest and richest expression in the golden age of Greece, and thus it is to Greek mythology that one must turn for the best form of any legend which foreshadows history. Yet the prevalence of legends regarding flight, existing in the records of practically every race, shows that this form of transit was a dream of many peoples鈥攎an always wanted to fly, and imagined means of flight. � 欧美VIVOdesHD,欧美专区欧美图片,欧美大片在线视频-中文字幕无线码,中文字幕免费电影 � � But I'm afraid she'll never come back! sobbed Lydia. "I'm so frightened to stop here by myself." The young master was borne in the arms of his faithful servant to the steamboat, and there nursed by him with unremitting attention during the journey up the river; nor did he leave him till he had placed him in his father鈥檚 arms. Well, said he, quietly, when he and his father rose to go away, "think what you please, but I know that if one of my reapers was to fall down in the field that way, let him be praying or cursing, I should consider it a hospital case."