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National Geographic : 1920 Mar
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THE NATIONAL GEOGRAPHIC MAGAZINE A CLOTH-PRINTING MACHINE: LAWRENCE, MASSACHUSETTS To see white cloth entering one of these big presses and coming out at a speed of thou sands of yards an hour, with a dozen different colors, every one in perfect register, is to realize how much science has done to give us attractive clothes. and complicated threading, but they need not be described here. HOW THE CLOTH IS WOVEN In the weaving process for plain cloth the one harness goes up as the other goes down, so that the shuttle with the woof passes under every other thread and over the alternate ones. Next trip through it passes over the ones it went under before and under those it passed over. When a new lot of identical warp is to be put into the loom, the slow process of threading the harness is not resorted to; rather the ends of the old are knotted to the ends of the new. To tie 2,000 knots is no mean job. It is performed by a little machine that can tie 240 knots a minute-four a second. The ends of the threads of the old warp are placed alongside those of the new and the tying mechanism set in motion. 220
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