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When he was about fourteen years old he built a steam engine. He used a bicycle pump for the cylinder and pieces of an old sewing machine, a discarded wringer, some brass wires, and other odds and ends for the rest of the parts. So perfect mechanically was this product that when steam was turned on it ran smoothly, and with very little noise, at the rate of three thousand revolutions a minute.
It was necessary that the "driver" should be a man of judgment, for the horses had to be kept at just the right speed, and to do this he must gauge the motion of the cylinder by the pitch of its deep bass song. The three men in command of the machine were set apart as "the threshers."
She does not build a party-wall, which the diameter of the cylinder would not permit; she confines herself to putting up a frail circular pad of green putty, as though to limit, before any attempt at harvesting, the space to be occupied by the Bee-bread, whose depth could not be calculated afterwards if the insect did not first mark out its confines. Can there really be an act of measuring?
Then she set the cylinder turning of her own accord, with her right hand, in the propitious direction, and sent it round seven times with the utmost gravity. At this point, encouraged by Hilda's example, I too became possessed of a brilliant inspiration. I opened my purse and took out of it four brand-new silver rupees of the Indian coinage.
He took my place, and in a moment the needle in the galvanometer responded to his grasp on the cylinder, exactly as the inventive philosopher had stated to be the due result of the experiment. I was startled. "But how came you, Mr. Margrave, to be so well acquainted with a scientific process little known, and but recently discovered?" "I well acquainted! not so.
The steel point which I had noticed in the hole at the apex of the conical end, was now seen to be the pointed termination of a slender steel rod which projected fully an inch into the cavity of the cylinder, and the conical end itself was a solid mass of lead. "Well?" queried Thorndyke, seeing that I was still silent.
The condenser afterwards attained its true effective manhood at Soho The Newcomen engine was in fact a condensing engine, but as the condensation was effected inside the steam cylinder it was a very costly source of power in respect to steam. Watt's happy idea of condensing in a separate vessel removed the defect.
A. A high pressure cylinder 10 inches diameter, 4 feet stroke, making 35 revolutions with steam of 90 to 100 lbs. on the square inch, supplied by three cylindrical boilers 30 inches diameter and 20 feet long, works two vertical saws of 34 inches stroke, which are capable of cutting 30 feet of yellow pine, 18 inches deep, in the minute.
In high pressure engines the thickness of the cylinder should be about 1/16th its diameter, which, with a pressure of steam of 80 lbs. upon the square inch, will occasion a strain of 640 lbs. upon the square inch of section of the metal; and the thickness of the metal of the trunnion bearings of high pressure oscillating engines should be 1/13th of the diameter of the cylinder.
Between the eastern sledge and the cairn a bamboo was placed, containing a metal cylinder, and in this the following record was left: 'November 12, 1912, Lat. 79 degrees, 50 mins. South.
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