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Updated: June 25, 2025
The whole operation did not last more than a few minutes; he saw the men reach the railway, pass the rope through the pulley there, and then secure it to the waiting engine. The officer now came up and joined Helmar. "You have done well, my lad," he cried. "Do you think the stanchion will hold the weight of the heavy guns?" "I hope so, sir," answered Helmar, eyeing the crowbar narrowly.
But this constancy cannot be obtained. The coefficient of friction varies with the condition of lubrication of the surface of the pulley, which alters during the running and with every change in the velocity and temperature of the rubbing surfaces.
We hung a pulley on a beam fixed to project from the top of the cliff. We found the great slab of rock, which formed the door, placed clumsily in its place and secured by a few stones. Its own weight kept it in safe position. In order to enter, we had to push it in; and we passed over it. We found the great coil of chain which Van Huyn had described fastened into the rock.
They are greatly in demand at the dinner hour; you dine thirty feet up in the air, and your food is brought up by a rope and pulley. When M. Flamaran appeared on the platform he took off his hat, and leaned with both hands on the railing to give a look around. The attitude suggested a public speaker. His big gray head was conspicuous in the light of the setting sun.
George passed the great steel rope safely through the pulley, and the work went on until the hawser had passed the second block on the railway. The engine then came back, and as soon as the great cable was secured to it, it started again for the town. The work had started in real earnest.
If it refuses to pass, or, if passed, turns very unwillingly, the bearings must be out of line; in which case the following operation will put things right. Remove the bearing on the pulley side, and enlarge the hole slightly. Then bore a hole in the centre of a metal disc, 1 inch in diameter, to fit the bearing; and drill three holes for screws to hold the disc against the case.
Fresh fish, just out of the water, were a particularly pleasant arrival to people who had been ten days out at sea. How were they to get them on board? Nothing easier, since the little "Swallow" could run along so nicely under the stern of the great steamer, after a line was thrown her; and a large basket was swung out at the end of a long, slender spar, with a pulley to lower and raise it.
It will be seen that the alternate motion of these pedals must cause a rotation of the pulley in one direction or the other, and that consequently the fan will rise or fall more or less rapidly, and give a quantity of air that varies according to the rapidity with which the toes are moved. La Nature. By J. WALLACE, C.E.
If it be borne in mind, in addition to all this, that the buildings of the Assyrians show them to have been well acquainted with the principle of the arch, that they constructed tunnels, aqueducts, and drains, that they knew the use of the pulley, the lever, and the roller, that they understood the arts of inlaying, enamelling, and overlaying with metals, and that they cut gems with the greatest skill and finish, it will be apparent that their civilization equalled that of almost any ancient country, and that it did not fall immeasurably behind the boasted achievements of the moderns.
By means of the cord the arena-slaves rove through the pulley first a light rope, then a very strong one. The end of this rope they fastened to an iron ring, from which hung four stout chains, three of them of equal length, each about thirty feet, whose lower ends, at points precisely equidistant from each other, were fastened to a big iron hoop all of twenty-four feet across.
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