['220', '(#292)', '############################################', 'WOOLLEN', 'AND', 'WORSTED', 'SPINNING', '60', 'arc', 'weight', 'of', 'the', 'top', 'roller', 'is', 'not', 'sufficient,', 'then', 'rather', 'than', 'add', 'a', 'complex', 'weighting', 'system', 'it', 'may', 'be', 'better', 'to', 'add', 'a', 'third', 'roller', 'in', 'which', 'the', 'tension', 'on', 'the', 'sliver', 'will', 'be', 'increased', 'probably', 'according', 'to', 'the', 'formula', 'given', 'on', 'page', '188.', 'With', 'front', 'roller', 'control', 'the', 'con-', 'ditions', 'are', 'very', 'different.', 'To', 'obviate', 'wildness', 'of', 'the', 'fibres', 'as', 'they', 'enter', 'the', 'front', 'rollers', '(the', 'change', 'of', 'speed', 'of', 'fibres', 'being', 'in', 'proportion', 'to', 'the', 'draft', 'and', 'coming', 'on', 'suddenly)', 'the', 'faller', 'or', 'carrier', 'should', 'be', 'able', 'to', 'act', 'as', 'close', 'up', 'to', 'the', 'front', 'roller', 'as', 'possible.', 'But', 'to', 'effect', 'this', 'small', 'front', 'rollers', 'are', 'desirable.', 'But', 'as', 'the', 'speed', 'of', 'the', 'fibres', 'is', 'to', 'be', 'suddenly', 'increased', 'a', 'powerful', 'nip', 'is', 'necessary.', 'Even', 'mechanical', 'weighting', 'fails', 'to', 'control', 'long', 'wool', 'fibres', '(over', '3', 'in.)', 'unless', 'acting', 'with,', 'say,', 'a', '3', 'in.', 'or', '4', 'in.', 'roller', 'to', 'give', 'the', 'necessary', 'of', 'contact.”', 'Thus', 'a', 'compromise', 'is', 'arrived', 'at-the', 'metal', 'fluted', 'bottom', 'front', 'roller', '(driven)', 'is', 'made', 'as', 'small', 'as', 'possible,', 'and', 'the', 'leather', 'covered', 'top', 'roller', 'is', 'made', 'sufficiently', 'large', '(say', '6', 'in.', 'to', '8', 'in.)', 'to', 'assure', 'a', 'reasonably', 'long', 'arc', 'of', 'contact,', 'and', 'weighted', 'by', 'either', 'springs', 'or', 'hung-on', 'weights.', 'Again', 'this', 'problem', 'has', 'never', 'been', 'satisfactorily', 'faced,', 'little', 'better', 'than', 'rule-of-thumb', 'methods,', 'which', 'have', 'been', 'found', 'by', 'practice', 'to', 'give', 'good', 'results,', 'being', 'adopted.', 'The', 'further', 'adjustment', 'of', 'back', 'and', 'front', 'rollers', 'to', 'control', 'drafting', 'will', 'be', 'best', 'studied', 'by', 'reference', 'to', 'Figs.', '58', 'and', '69.', 'It', 'will', 'at', 'once', 'be', 'noted', 'that', 'while', 'in', 'gill-boxes', 'the', 'drive', 'is', 'from', 'the', 'back', 'to', 'the', 'front', '(more', 'speed', 'of', 'front', 'rollers,', 'i.e.', 'more', 'teeth', 'in', 'change', 'wheel', 'giving', 'more', 'draft),', 'in', 'drawing-boxes', 'it', 'is', 'usual', 'to', 'drive', 'from', 'the', 'front', 'to', 'the', 'back', '(more', 'speed', 'of', 'back', 'rollers,', 'i.e.', 'more', 'teeth', 'in', 'change', 'wheel', 'giving', 'less', 'draft).*', 'The', 'setting', 'of', 'the', 'carriers', 'between', 'the', 'back', '>', '*', 'The', 'reason', 'for', 'this', 'should', 'be', 'clearly', 'thought', 'out.', '220']
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