['187', '(#249)', '############################################', 'ING', 'PRINCIPLES', 'IN', 'WORSTED', 'DRAWING', 'in.', 'to', 's', 'un', 'other', 'rollers', 'either', 'by', 'fallers', 'or', 'carriers.', 'Fallers', 'naturally', 'eliminate', 'the', 'necessity', 'for', 'or', 'the', 'possibility', 'of', 'twist', 'support;', 'but', 'carriers', 'offer', 'little', 'or', 'no', 'obstruction', 'to', 'twist', 'support', 'and', 'twist-fibre-control.', 'Thus', 'it', 'comes', 'about', 'that', 'it', 'is', 'customary', 'to', 'add', 'such', 'twist', 'to', 'slivers', 'coming', 'from', 'any', 'given', 'box', 'as', 'will', 'best', 'ensure', 'perfect', 'delivery', 'from', 'the', 'box,', 'and', 'more', 'particularly', 'ensure', 'the', 'control', 'of', 'these', 'slivers', 'during', 'entry', 'into', 'and', 'drafting', 'in', 'the', 'succeeding', 'box.', 'In', 'open', 'drawing', 'the', 'twist', 'added', 'is', 'designed', 'to', 'ensure', 'strength', 'of', 'sliver', 'for', 'winding', 'on', 'to', 'the', 'bobbin', 'and', 'yet', 'not', 'to', 'interfere', 'with', 'the', 'fibres', 'sliding', 'upon', 'one', 'another.', 'Usually', 'the', 'twist', 'will', 'be', 'decided', 'to', 'ensure', 'efficient', 'control', 'during', 'drafting,', 'this', 'being', 'ample', 'to', 'ensure', 'efficient', '"winding', 'on"', 'and', '"drawing', 'off.”', 'It', 'is', 'much', 'to', 'be', 'regretted', 'that', 'so', 'little', 'is', 'known', 'about', 'the', 'frictional', 'co-efficients', 'of', 'fibres,', 'since', 'the', 'amount', 'of', 'twist', 'may', 'obviously', 'be', 'varied', 'in', 'accordance', 'with', 'the', 'friction', 'of', 'fibre', 'on', 'fibre.', 'Thus', 'to', 'satisfactorily', 'control', 'Alpaca', 'slivers', 'much', 'more', 'twist', 'must', 'be', 'inserted', 'than', 'in', 'drawing', 'wool', 'slivers', 'of', 'a', 'similar', 'thickness,', 'while', 'for', 'Ovibos', '-apparently', 'a', 'very', 'slippery', 'fibre--less', 'twist', 'is', 'needed.*', 'From', 'recent', 'researches', 'carried', 'out', 'in', 'the', 'University', 'of', 'Leeds', 'two', 'results', 'obtained', 'have', 'a', 'bearing', 'on', 'this', 'present', 'problem.', 'It', 'has', 'been', 'found', 'that', 'to', 'obtain', 'the', 'maximum', 'strength', 'for', 'any', 'yarn', 'or', 'sliver', 'an', 'ex-', 'terior', 'fibre', 'angle', 'of', 'about', '25°', 'is', 'necessary.', 'The', 'discovery', 'also', 'has', 'been', 'made', 'that', 'unless', 'an', 'angle', 'approximating', 'to', '25°', 'is', 'obtained,', 'under', 'con-', 'tinuous', 'strain', 'such', 'as', 'during', 'weaving,', 'there', 'may', 'be', 'slipping', 'of', 'the', 'fibres', 'one', 'upon', 'the', 'other.', 'It', 'will,', 'therefore,', 'be', 'obvious', 'that', 'in', 'drafting,', 'an', 'exterior', 'fibre', 'angle', 'under', '25°', 'must', 'be', 'given,', 'and', 'that', '*', 'The', '“spring”', 'of', 'Alpaca', 'and', 'the', '“', 'plasticity"', 'of', 'the', 'Ovibos', 'fibre', 'is', 'probably', 'the', 'explanation.', ')', '187']
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