['174', '(#236)', '############################################', 'WOOLLEN', 'AND', 'WORSTED', 'SPINNING', 'the', 'principles', 'of', 'working', 'the', 'slivers', 'through', 'French', 'sets', 'of', 'drawing-boxes.', 'The', 'Drawing', 'Mechanism.-The', 'first', 'principles', 'of', 'worsted', 'drawing,', 'then,', 'to', 'be', 'dealt', 'with', 'will', 'have', 'immediate', 'reference', 'to', 'the', 'three', 'types', 'of', 'worsted', 'sliver-', 'preparing', 'boxes,', 'viz.', 'The', 'ordinary', 'gill-box;', 'The', 'ordinary', 'drawing-box;', 'and', 'The', 'porcupine-box', '(or', 'French', 'drawing-box).', 'In', 'each', 'of', 'these', 'types', 'of', 'machine', 'there', 'will', 'be', 'front-rollers', 'to', 'be', 'run', 'as', 'quickly', 'as', 'possible,', 'in', 'order', 'that', 'as', 'great', 'a', 'weight', 'of', 'sliver', 'as', 'possible', 'may', 'be', 'delivered', ';', 'and', 'back-rollers', 'which', 'will', 'be', 'run', 'just', 'so', 'much', 'below', 'the', 'front', 'roller', 'speed', 'that', 'the', 'right', 'draft', 'or', 'extension', 'may', 'be', 'given', 'to', 'the', 'slivers', 'under', 'treatment.', 'In', 'the', 'ordinary', 'gill-box', 'the', 'slivers', 'are', 'supported', 'between', 'the', 'back', 'and', 'front', 'rollers', 'by', 'a', 'series', 'of', 'pinned', 'fallers', 'controlled', 'on', 'the', 'screw-thread', 'principle', '(see', '“', 'Wool', 'Carding', 'and', 'Combing,"', 'p.', '201).', 'In', 'the', 'ordinary', 'drawing-box', 'the', 'slivers', 'between', 'back', 'and', 'front', 'rollers', 'are', 'supported', 'and', 'in', 'part', 'con-', 'trolled', 'by', 'the', 'carriers,', 'the', 'action', 'of', 'which', 'must', 'be', 'carefully', 'studied.', 'In', 'the', 'case', 'of', 'the', 'French', 'drawing-box', 'the', 'slivers', 'are', 'supported', 'by', 'the', 'porcupine,', 'which', 'may', 'be', 'regarded', 'as', 'a', 'continuous', 'gilling', 'arrangement.', 'It', 'should', 'be', 'remarked', 'here', 'that', 'in', 'the', 'ordinary', 'drawing-box', 'twisted', 'slivers', 'may', 'be', 'treated,', 'but', 'in', 'the', 'gill-box,', 'and', 'in', 'the', 'French', 'drawing-box,', 'twist', 'is', 'un-', 'thinkable', 'and', 'probably', 'impossible.', 'The', 'importance', 'of', 'this', 'limitation', 'will', 'be', 'apparent', 'when', 'English', 'and', 'French', 'methods', 'of', 'sliver', 'treatment', 'come', 'to', 'be', 'con-', 'trasted.', '174']
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