Installment of E. A. Posselt's serial on cotton spinning, from the December 1907 issue of Posselt's Textile Journal, covering the roll stands of the ring frame. It describes the parts of the drafting roll stand, top and bottom rolls, cap bars, lever weighting, the scavenger roll and the traverse guide rod. It also describes the Whitin Machine Works traverse motion and a roll stand adjustable while the frame is running. The opening page lists the contents of the whole series on ring spinning, faulty yarns and calculations.