American School of Correspondence · Chicago, American school of correspondence · leaf 266
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 … £2 X 91 &A3iindoNiAma circumferential velocity shall be maintained at all times between itand the flyer. 335 194 COTTON SPINNING Number 3 shows the bobbin as two inches in diameter, and, inorder to wind the proper length of roving, it will have to makeabout three-eighths of a revolution. The…
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