['219', '(#291)', '############################################', 'TYPES', 'OF', 'DRAWING', 'MACHINES', 'All', 'these', 'frictions', 'give', 'rise', 'to', 'electrification,', 'but', 'if', 'the', 'roller', '*', 'fibre', 'friction', 'gives', 'rise,', 'say,', 'to', 'negative', 'electrification', 'of', 'the', 'sliver', 'and', 'the', 'fibre', 'x', 'fibre', 'gives', 'rise', 'to', 'positive', 'electrification,', 'then', 'the', 'one', 'may', 'neu-', 'tralize', 'the', 'other.', 'The', 'interesting', 'researches', 'conducted', 'by', 'Dr.', 'Shorter', 'at', 'the', 'University', 'of', 'Leeds', 'on', 'behalf', 'of', 'the', 'University', 'and', 'the', 'British', 'Research', 'Association', 'for', 'the', 'Woollen', 'and', 'Worsted', 'Industries', 'have', 'shown', 'that', 'even', 'the', 'nature', 'of', 'the', 'guide', 'or', 'roller', 'round', 'which', 'the', 'wool', 'passes', 'has', 'an', 'electrical', 'effect,', 'and', 'may', 'add', 'to', 'or', 'take', 'from', 'the', 'tendency', 'of', 'slivers', 'so', 'passed', 'to', 'electrification.', 'The', 'electrical', 'natures', 'of', 'chrome', 'leather', 'and', 'tan', 'leather', 'are', 'so', 'different', 'that', 'it', 'will', 'not', 'do', 'to', 'use', 'either', 'indiscriminately.', 'It', 'is', 'also', 'well', 'to', 'note', 'that', 'certain', 'firms', 'place', 'on', 'the', 'market', 'neutralizing', '(con-', 'ducting)', 'roller-coverings.', 'These,', 'however,', 'usually', 'con-', 'tain', 'a', 'good', 'conductor', '(glycerine),', 'and', 'as', 'this', 'becomes', 'sticky', 'in', 'a', 'moist', 'atmosphere', 'their', 'use', 'is', 'very', 'limited.', 'Examination', 'of', 'worsted', 'drawing', 'machines', 'will', 'reveal', 'the', 'fact', 'that', 'rollers', 'for', 'controlling', 'long', 'fibres', 'are', 'soft', 'covered', 'as', 'against', 'rollers', 'controlling', 'short', 'fibres', 'being', 'hard', 'covered.', 'That', 'is', 'to', 'say,', 'that', 'the', 'covering', 'for', 'long', 'wool', 'drafting', 'rollers', 'is', 'first', 'a', 'layer', 'of', 'felt', 'cloth', 'and', 'then', 'the', 'leather', 'outer', 'covering.', 'The', 'reason', 'for', 'this', 'would', 'seem', 'to', 'be', 'that', 'length', 'of', 'grip', '(roller', 'contact)', 'should', 'bear', 'some', 'relationship', 'to', 'the', 'length', 'of', 'fibre', 'being', 'treated—long', 'fibre,', 'long', 'grip;', 'short', 'fibre,', 'short', 'grip.', 'But', 'again', 'almost', 'rule-of-', 'thumb', 'methods', 'are', 'being', 'employed—there', 'is', 'here', 'also', 'again', 'much', 'room', 'for', 'research.', 'The', 'relative', 'sizes', 'of', 'back', 'and', 'front', 'rollers', 'and', 'their', 'weighting', 'is', 'again', 'a', 'matter', 'of', 'much', 'interest.', 'With', 'the', 'thick,', 'inert', 'slivers', 'entering', 'the', 'back', 'rollers', 'it', 'will', 'be', 'evident', 'that', 'dead', 'weighting', 'will', 'be', 'the', 'best,', 'this', 'resulting', 'in', 'fibre', 'weighting', 'fibre.', 'But', 'if', 'the', 'natural', '219']
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