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Starback, 2592 C, was first selected. A message for help was written on waterproof paper, rolled up, and lashed to his tail-feathers on the under side. He was thrown into the air and disappeared. Half an hour later, a second, the Big Blue Corner-box, 2600 C, was freighted with a letter. He flew up, but almost immediately returned and alighted on the rigging.
When all the machinery except the spindles is thrown off, the power required is 21 horses, so that 2592, the total number of spindles, divided by 21, the total power, is the number of twisting spindles worked by each actual horse power. The number is 122.84.
To take another example in the case of a mill for twisting cotton yarn into thread: In this mill there are 27 frames with 96 common throstle spindles in each, making in all 2592 spindles. The spindles turn 2200 times in a minute; the bobbins are 1-7/8 inches diameter, and the part which holds the thread is 2-3/16 inches long.
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