['241', '(', '313', ')', 'PRINCIPLES', 'AND', 'PRACTICE', '--', 'certain', 'mechanisms', 'are', 'specially', 'suited', 'to', 'the', 'spinning', 'of', 'specific', 'types', 'of', 'yarns', ',', 'thus', '(', 'a', ')', 'the', 'flyer frame', 'is', 'usually', 'employed', 'for', 'long', 'lustre', 'wools', ';', 'and', 'sometimes', 'for', 'fine', 'Botany', 'wools', ';', '(', 'b', ')', 'the', 'cap', 'frame', 'is', 'usually', 'employed', 'for', 'cross-bred', 'and', 'Botany', 'wools', ';', '(', 'c', ')', 'the', 'ring frame', 'is', 'usually', 'employed', 'for', 'fine', 'Botany', 'wools.', 'd', ')', 'the', 'mule', 'is', 'usually', 'employed', 'for', 'fine', 'and', 'short', 'Botany', 'or', 'for', 'fine', 'cross-bred', 'wools.', 'The', 'characteristic', 'features', 'of', 'each', 'of', 'the', 'machines', 'under', '(', 'a', ')', ',', '(', 'b', ')', 'and', '(', 'c', ')', 'are', 'shown', 'in', 'Fig.', '68.', 'The', 'action', 'of', 'the', 'flyer', 'and', 'bobbin', 'will', 'be', 'understood', 'from', 'what', 'has', 'already', 'been', 'stated', 'about', 'the', 'flyer', 'action', 'with', 'reference', 'to', 'open', 'and', 'cone', 'drawing.', 'It', 'has', 'ap-', 'parently', 'been', 'found', 'impossible', 'to', 'construct', 'a', 'cone', 'spinning', 'frame', ',', 'and', 'therefore', 'the', 'size', 'of', 'the', 'spinning bobbin', 'is', 'limited', 'to-', 'Spool Bobbin', '54', '"', 'x', '2', '"', '4', '"', 'x', '2', '"', 'for', '8', "'s", 'to', '32', "'s", ',', '41', '"', 'x', '11', '"', '31', '"', 'x', '1', '}', '"', 'for', '32', "'s", 'to', '56', "'s", ',', 'and', '31', '"', '3', '"', 'X', 'I', '}', '"', 'for', 'fine', 'Botany', 'spinning', ';', '5', '"', 'X', '1', '"', 'In', 'the', 'case', 'of', 'the', 'flyer frame', ',', 'the', 'weight', 'of', 'the', 'flyer', 'and', 'the', 'speed', 'at', 'which', 'the', 'bobbin', 'when', 'full', 'must', 'follow', 'the', 'flyer', 'reduces', 'the', 'maximum', 'speed', 'of', 'this', 'frame', 'to', 'about', '2,500', 'revolutions', 'per', 'minute.', 'By', 'employing', 'specially', 'constructed', 'spindles', 'greater', 'speeds', 'than', 'this', 'have', 'been', 'obtained', ',', 'but', 'it', 'is', 'more', 'usual', 'to', 'run', 'at', 'slower', 'speeds', ',', 'thereby', 'producing', 'a', 'more', 'lustrous', 'yarn', 'showing', 'less', 'of', 'a', '“', 'beard”', 'on', 'the', 'bobbin', 'The', 'beard', 'on', 'the', 'bobbin', 'will', 'be', 'indicative', 'of', 'roughness', 'of', 'yarn', 'and', 'will', 'also', 'be', 'detrimental', 'in', 'running', 'the', 'yarn', 'off', 'the', 'bobbin', ',', 'as', 'well', 'as', 'being', 'unsightly.', 'The', 'modification', 'of', 'the', 'lifter', 'Q', '241']
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