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Updated: June 25, 2025
Here the lever at work, there the winch and pulley, here the balance, there the capstan. Everywhere heaps of stones, and piles of fascines, mantelets, and rows of fire-barrels. Mantelets rolling, the hammer tapping all day, horses and carts in endless succession rattling up with materials.
The crew were now in the boats, the sailors standing by the pulley ropes let them slip through the cleats in jerks, and down the boats went till level with B deck; women and children climbed over the rail into the boats and filled them; when full, they were lowered one by one, beginning with number 9, the first on the second-class deck, and working backwards towards 15.
For this purpose what is known as a "mechanic" was used to assist them in their schooling. This consisted of a belt placed about the beginner's waist. >From it a rope led up over a pulley, the other end of the rope being securely held by someone. When all was ready the pupil would take a running start, jump into the air and try to turn.
The cables extended downward and connected with another equally large pulley at the bottom of the apparatus, whence they passed to the drum of a windlass held in place by means of heavy timbers.
I had just finished showing an Intelligence Officer how to get a belt back on to the pulley of his motor-cycle when Cecil met me and told me we were to move north that evening. We had a delectable little tea, bought a map or two, and then strolled back to the barracks. Indeed it was our boast that such was our ingenuity we were able to carry more kit than any regimental officer.
In his lightest talk he was almost always edging towards a practical object, and it was an interesting and instructive amusement to watch for the moment at which he would ship the belt of his colloquial machinery on to the tight pulley. It was done so easily and naturally that there was hardly a sign of it.
The yellowish individual had kept his word, for it was no simple derrick that he had erected above the open trench to let the heavy block of granite down into its place. It was not the simple tripod that Ñor Juan had wanted for suspending a pulley from its top, but was much more, being at once a machine and an ornament, a grand and imposing ornament.
For though the place had been cleared and weeded, the tiny green things still grew in the chinks of the pavement. In the middle of the court was a well with a cover and yoke of old-fashioned twisted iron and a pulley to draw the water. The air was bright and fresh outside the castle, but the reverberating rays of the sun made the quiet courtyard warm and still.
In the ordinary strap dynamometer a flexible band, sometimes carrying segments of wood blocks, is hung over a pulley rotated by the motor, the power of which is to be measured. But the work consumed in friction can be expressed in another way. Hence, for the belt to remain at rest with two fixed weights, Q and P, it is necessary that the coefficient of friction should be exactly constant.
The place of the small pulley was taken by an 8-toothed pinion wheel, engaging with a pinion soldered to the near driving wheel, the diameter of which it exceeded by about 3/16 inch. The pair, originally parts of an old clock purchased for a few pence, gave a gearing-down of about 9 times. The position of the driven wheels relatively to the armature must be found experimentally.
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