['204', '(', '272', ')', 'WOOLLEN', 'AND', 'WORSTED', 'SPINNING', 'has', 'been', 'wound', 'on', 'to', 'each', 'bobbin', 'The', 'bobbins', 'are', 'then', 'weighed', 'on', 'such', 'a', 'balance', 'as', 'that', 'illustrated', 'in', 'Fig.', '60', ',', 'and', 'as', 'the', 'wood', 'bobbins', 'themselves', 'weigh', 'the', 'same', ',', 'and', 'the', 'lengths', 'of', 'sliver', 'upon', 'these', 'are', 'the', 'same', ',', 'any', 'differences', 'there', 'may', 'be', 'are', 'due', 'to', 'irregu-', 'larities', 'in', 'sliver.', 'The', 'bobbins', 'are', 'then', 'balanced', 'up', 'against', 'one', 'another', 'and', 'irregularities', 'thus', 'corrected.', 'It', 'is', 'a', 'matter', 'of', 'opinion', 'how', 'often', 'during', 'the', 'drawing', 'processes', 'this', 'should', 'be', 'done.', 'The', 'same', 'idea', 'may', 'also', 'be', 'applied', 'to', 'gill-boxes', 'so', 'that', 'two', 'types', 'of', 'knocker-off', 'motion', 'are', 'in', 'use', ',', 'viz.', '1.', 'The', 'gill-box', 'knocker-off', 'for', 'shorter', 'lengths', 'of', 'thick', 'slivers', ';', 'and', '2.', 'The', 'drawing-box', 'knocker-off', 'for', 'longer', 'lengths', 'of', 'finer', 'slivers.', 'Each', 'motion', 'includes', 'ingenious', 'features', 'which', 'should', 'be', 'thoroughly', 'studied', ',', 'the', 'first', 'employing', 'the', 'equivalent', 'of', 'the', '“hunting', 'tooth”', 'and', 'the', 'latter', 'the', 'advantage', 'of', 'a', 'worm', 'and', 'worm-wheel', '3.', 'The', 'Cone Drawing-box.-As', 'fully', 'explained', 'in', 'the', 'succeeding', 'chapter', ',', 'the', 'basic', 'difference', 'between', 'the', 'cone', 'and', 'open', 'types', 'of', 'drawing-boxes', 'is', 'in', 'the', 'method', 'adopted', 'of', 'positively', 'controlling', 'the', 'speed', 'of', 'the', 'bobbin', '(', 'a', ')', 'to', '"', 'lead”', 'on', 'the', 'spindle-speed', 'in', 'order', 'to', 'take', 'up', 'exactly', 'the', 'sliver', 'delivered', 'by', 'the', 'front rollers', 'and', 'to', 'obviate', 'possible', 'rupture', 'of', 'sliver', ';', 'and', '(', '6', ')', 'to', 'change', 'this', '"', 'lead', '”', 'according', 'to', 'the', 'bobbin', 'change', 'in', 'circumference', ',', 'i.e.', 'to', 'change', 'its', 'number', 'of', 'revolutions', 'as', 'it', 'increases', 'in', 'diameter', 'in', 'order', 'to', 'maintain', 'a', 'constant', 'surface', 'or', '"', 'taking-up”', 'speed.', '204']
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