['217', '(', '289', ')', 'TYPES', 'OF', 'DRAWING MACHINES', 'wool', 'will', 'wear', 'iron.', 'Again', 'those', 'who', 'have', 'had', 'to', 'deal', 'with', 'nicked', '”', 'or', 'irregularly', 'worn', 'rollers', 'know', 'to', 'their', 'bitter', 'cost', 'how', 'wool', 'may', 'wear', 'rollers', 'Of', 'course', 'wrong', 'setting', 'of', 'rollers', 'may', 'make', 'irregular', 'wear', 'of', 'rollers', 'almost', 'inevitable', ',', 'but', 'with', 'rollers', 'made', 'out', 'of', 'suitable', 'metal', 'it', 'would', 'seem', 'possible', 'to', 'give', 'the', 'worsted', 'drawer', 'easier', 'control', 'of', 'the', 'fibres', 'he', 'has', 'to', 'treat', 'without', 'leaving', 'the', 'fear', 'of', 'the', 'irregular', 'wear', 'of', 'rollers', 'all', 'the', 'time', 'at', 'the', 'back', 'of', 'his', 'mind.*', 'Thus', 'it', 'would', 'seem', 'that', 'here', 'is', 'a', 'field', 'for', 'useful', 'research', 'in', 'which', 'technologist', ',', 'engineer', 'and', 'metallurgist', 'should', 'combine.', 'Rollers', 'may', 'be', 'made', 'with', 'plain', ',', 'milled', 'or', 'fluted', 'surfaces.', 'Which', 'of', 'these', 'surfaces', 'is', 'adopted', 'will', 'depend', 'upon', 'the', 'work', 'the', 'roller', 'has', 'to', 'do.', 'As', 'all', 'rollers', 'should', 'nip', 'the', 'wool', 'without', 'rubbing', 'or', 'cutting', 'it', ',', 'it', 'will', 'be', 'evident', 'that-', 'The', 'nature', 'of', 'the', 'surface', 'of', 'the', 'roller', ',', 'and', 'The', 'weighting', 'of', 'the', 'roller', 'must', 'between', 'them', 'ensure', 'the', 'required', 'firm', 'nip.', 'Thus', ',', 'smooth-surface rollers', 'would', 'apparently', 'offer', 'less', 're-', 'sistance', 'to', 'slipping', 'than', 'rough-surface rollers', ',', 'rough-', 'surface', 'would', 'control', 'less', 'than', ',', 'say', ',', 'one', 'smooth', 'and', 'one', 'fluted', 'roller', 'acting', 'together', ',', 'one', 'leather-covered smooth roller', 'and', 'one', 'shallow fluted roller', 'would', 'control', 'still', 'better', ',', 'while', 'two', 'deep-fluted rollers', 'acting', 'together', 'with', 'a', 'leather', 'sheet', 'in', 'between', 'or', 'two', 'leather', 'covered', 'rollers', 'would', 'act', 'better', 'still.', 'Again', ',', 'hard and soft covered rollers', 'must', 'be', 'carefully', 'studied', 'in', 'view', 'of', 'the', 'work', 'to', 'be', 'done.', 'A', 'careful', 'examination', 'of', 'pairs', 'of', 'rollers', 'in', 'drawing boxes', 'makes', 'it', 'evident', 'that', 'there', 'are', 'three', 'conditions', 'of', 'control', 'exercised', ':', '-', 'the', '•', 'Under', 'certain', 'circumstances', 'it', 'is', 'desirable', 'to', 'traverse', 'sliver', 'to', 'ensure', 'approximately', 'equal', 'wear', 'across', 'the', 'surface', 'of', 'the', 'rollers', '217']
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