Such figures demonstrate the important position taken by the cotton gin among the developing agents of the cotton growing States. It has rendered possible and profitable the cultivation of large districts of otherwise waste lands; it has stimulated cotton production; given employment to thousands of idle hands; cheapened the price of cotton cloths, and placed within the reach of the humblest people wearing apparel of fine and beautiful texture. Unlimited supply of raw material being thus provided, attention reverted to perfecting the machines for spinning it, and under the magical touch of Richard Roberts, of Manchester, England, in 1830, the crude mule of Crompton took practical shape. He gave to it the quadrant winding motion, provided for the harmonious working of the counter and copping faller wires, perfected the “backing off” and “drawing up” mechanisms, and gave attention to construction of details that placed the mule before the world as a practical success. Equipped in its present form, the self-acting mule presents one of the most striking examples of complex automatic mechanisms that can be found in the industrial world. The work of the attendant is confined to piecing broken ends and supplying roving, the machine passing through the entire cycle of its complicated movements without human direction. An idea may be had of its delicate and accurate operation when it is considered that one pound of cotton has been spun by it into a thread one hundred and sixty-seven miles long. Improvements have been made, indeed, on Roberts’s mule, but aside from changes in details and form, the machine, as it left the hands of this mechanical genius in 1830, remains unchanged. [Illustration: PRIMITIVE HAND LOOM.] During this period, the fly frame was developed from the machines of Hargreaves and Arkwright, but while it constituted a great advance over these machines, it presented no radical departure in principle. We may pause here, as we pass through the third decade of the present century, to witness the introduction of a spinning-frame, which, for originality of conception and far reaching influence on the textile industry, closely approximates the achievements of the pioneer inventions of this art. Reference is made to the ring frame in which the flyer is omitted, the bobbin being attached to the spindle and revolving with it. On the traverse rail, and surrounding each bobbin, is secured a flanged ring having loosely sprung thereon a light traveler, through which the yarn, as it comes from the drawing-rolls, is led to the bobbin. Revolution of the bobbin carries the traveler around the ring imparting twist to the yarn, and as it is spun it is wound on the bobbin in proportion to the feed of the drawing-rolls.