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National Geographic : 1920 Mar
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THE NATIONAL GEOGRAPHIC MAGAZINE "SLUBBER" MACHINES AT WORK IN A COTTON MILL In this picture we see the slivers being drawn out of the cans on the right. As they pass through the slubber they are given a twist which makes each fiber take hold of its neighbor, and here they begin to acquire tensile strength. They emerge from the machine on bobbins as "roving." The cotton in the cans is "sliver," while that on the bobbins in the foreground is "roving" (see text, page 215). sand and other foreign matter in the cotton lose hold. The opener then con tinues the work of picking the cotton to pieces. When the task is completed the staple is in tiny tufts. These are caught up by air suction, the dirt being left be hind, and carried to the fourth machine, a "breaker picker." The breaker picker gives the tiny tufts another beating, to remove persistent dirt, and then rolls them together in a great downy sheet on a rod. This sheet is known as "lap" (see page 208). Four of these laps are fed simultane ously into a fifth machine, known as the "intermediate picker." Still another beater plies its flails upon the cotton as it comes in. The four laps that go into this machine come out as one. In turn, four of these laps are fed into 212
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