['185', '(', '247', ')', 'PRINCIPLES', 'IN', 'WORSTED', 'DRAWING', 'rollers.', 'As', 'a', 'rule', 'it', 'may', 'be', 'taken', 'that', 'the', 'slivers', 'are', 'so', 'firmly', 'gripped', 'by', 'the', 'drafting rollers', 'that', 'there', 'is', 'no', 'slip.', 'Under', 'these', 'conditions', 'there', 'is', 'no', 'half-way', 'house-the', 'fibres', 'are', 'either', 'under', 'the', 'control', 'of', 'the', 'back rollers', 'or', 'of', 'the', 'front rollers', ',', 'and', 'if', 'there', 'is', 'any', 'question', 'the', 'front rollers', 'assert', 'their', 'strength', 'and', 'the', 'fibres', 'are', 'extended', 'or', 'broken.', 'If', ',', 'however', ',', 'the', 'grip', 'of', ',', 'say', ',', 'the', 'back rollers', 'is', 'inefficient', ',', 'then', 'whatever', 'the', 'dis-', 'tance', 'apart', 'may', 'be', 'the', 'front rollers', 'will', 'take', 'off', 'the', 'fibres', 'at', 'different', 'tensions', 'and', 'there', 'is', 'a', 'chance', 'of', 'a', 'looped', 'yarn', 'being', 'produced', ';', 'and', 'similarly', 'with', 'a', 'defective', 'grip', 'of', 'front rollers', 'Thus', 'the', 'following', 'con-', 'ditions', 'of', 'roller-gripping', 'are', 'possible', ',', 'and', 'the', 'results', 'in', 'each', 'case', 'should', 'be', 'thought', 'out', ',', 'or', ',', 'better', 'still', ',', 'experimented', 'with', ':', '-', 'Back rollers', 'failing', 'to', 'grip', 'Front rollers', 'gripping', ';', 'gripping', 'failing', 'to', 'grip', ';', 'failing', 'to', 'grip', 'failing', 'to', 'grip', ';', 'gripping', 'gripping.', 'The', 'last', 'is', ',', 'of', 'course', ',', 'the', 'correct', 'condition', ',', 'and', 'every', 'box', 'should', 'be', 'designed', 'and', 'clothed', 'to', 'effect', 'this.', 'Given', ',', 'then', ',', 'the', 'last', 'condition', ',', 'what', 'possible', 'settings', 'of', 'the', 'ratch”', 'are', 'there', '?', 'There', 'are', 'three', 'possible', 'settings', 'of', 'the', 'ratch', 'for', 'any', 'given', 'length', 'of', 'fibre', ',', 'viz.', '1.', 'Front rollers', 'taking', 'control', 'of', 'fibre', 'before', 'back rollers', 'release', 'fibres', '(', 'A', ')', ';', 'after', 'back rollers', 're-', 'lease', 'fibres', '(', 'C', ')', ';', '3.', 'just', 'as', 'back rollers', 'release', 'fibres', '(', 'B', ')', '.', '(', 'See', 'Fig.', '55', ')', 'It', 'is', 'obvious', 'that', 'with', 'modern', 'tops', ',', 'which', 'may', 'be', '60', '2.', '1', '185']
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