['191', '(#253)', '############################################', 'PRINCIPLES', 'IN', 'WORSTED', 'DRAWING', 'It', 'should', 'here', 'be', 'noted', 'that', 'while', 'for', 'open', 'drawing', 'a', 'maximum', 'amount', 'of', 'twist', 'may', 'be', 'necessary--although', 'from', 'the', 'point', 'of', 'view', 'of', 'rollers,', 'power', 'consumed,', 'etc.,', 'a', 'minimum', 'amount', 'would', 'obviously', 'be', 'desirable-in', 'the', 'case', 'of', 'cone', 'drawing', 'the', 'only', 'twist', 'absolutely', 'necessary', 'is', 'that', 'to', 'ensure', 'the', 'sliver', 'being', 'satisfactorily', 'drawn', 'off', 'the', 'bobbin', 'when', 'being', 'fed', 'in', 'to', 'the', 'succeeding', 'box,', 'although', 'frequently', 'more', 'twist', 'than', 'this', 'will', 'give', 'better', 'drafting', 'fibre-contact.', 'Thus', 'twist', 'will', 'be', 'a', 'function', 'of', 'fibre', 'friction', 'on', 'fibre', ';', 'bobbin', 'friction', 'on', 'bearings', '(type', 'of', 'creel)', ';', 'thickness', 'of', 'sliver', ';', 'speed', 'of', 'draw-off', 'of', 'sliver', ';', 'maximum', 'and', 'minimum', 'diameters', 'of', 'bobbin.', 'These', 'points', 'being', 'decided', 'experimentally', 'would', 'no', 'doubt', 'lead', 'to', 'a', 'method', 'or', 'rule', 'superior', 'to', 'the', 'present', 'almost', 'pure', 'empiricism.', 'Selection', 'of', 'Sets', 'of', 'Gill-', 'and', 'Drawing-boxes.', 'The', 'first', 'principles', 'involved', 'in', 'the', 'selection', 'of', 'gill-boxes', 'as', 'against', 'drawing-boxes', 'or', 'in', 'designing', 'suitable', 'com-', 'binations', 'of', 'gill-boxes', 'and', 'drawing-boxes', 'will', 'be', 'best', 'considered', 'when', 'dealing', 'with', 'drawing', 'and', 'spinning', 'for', 'the', 'coloured', 'trade.', 'It', 'should', 'here', 'be', 'noted,', 'how-', 'ever,', 'that', 'if', 'several', 'qualities', 'of', 'white', '(undyed)', 'tops', 'are', 'to', 'be', 'mixed', 'together-and', 'this', 'is', 'the', 'best', 'method', 'employed', 'in', 'Yorkshire', 'to', 'maintain', 'a', 'standard', 'quality', 'year', 'in', 'and', 'year', 'out--then', 'perfect', 'mixing', 'is', 'just', 'as', 'important', 'as', 'in', 'mixing', 'black', 'and', 'white', 'tops', ':', 'imperfect', 'mixing', 'will', 'eventually', 'result', 'in', 'defective', 'streaky', 'pieces.', 'That', 'the', 'streakiness', 'does', 'not', 'appear', 'until', 'the', 'pieces', 'are', 'piece-dyed', 'does', 'not', 'exonerate', 'the', 'spinner', 'from', 'responsibility', 'in', 'causing', 'the', 'defect.', '191']
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