American School of Correspondence · Chicago, American school of correspondence · leaf 265
of a revolution, from A to B, and the bob-bin has made one-quarter of a revolution, from C to D. Thelength wound is indicated by the distance measured around thebobbin, from D to E, which is 1.57 inches; twice as much as theempty bobbin. Now, as the speed of the flyer is constant and the length… … Ex. O COTTON SPINNING 193 ference, tlie only way that the same length of roving can be woundis by increasing the speed of the bobbin so that the same ratio in its
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