A short 1908 magazine piece praising Richard Roberts's self-acting mule spinning frame as the culmination of early cotton machinery invention. It explains how the mule draws, twists, backs off and winds yarn onto the cop as the carriage moves out and in, and describes the complex headstock mechanism. It also compares Roberts's machine with the earlier mules of Crompton and the spinning frame of Arkwright, and notes Roberts's 1832 patent and the machine's rapid adoption.