It is well known that one of the most serious difficulties in ring spinning is the variable pull upon the traveler, caused by the difference in diameter of the full and empty bobbins, and this is especially noticeable in spinning weft, or filling, when the diameter of the quill at the tip is not over 3-16 of an inch, while that of the base of the cone, or full bobbin, is from an inch to an inch and one-eighth. This variation in diameter causes the line of draught upon the traveler, which, with the full bobbin, forms nearly a tangent to the interior circle of the ring, to be nearly radial to it with an empty one, and this increased drag upon the traveler not only causes frequent breakage in spinning, but also stretches the yarn, so that it is perceptibly finer when it is spun on the nose of the bobbin than when it is spun on the bottom of the cone. Endeavors have been made to compensate for this difficulty by making a less draught at that period of the operation; but we believe the principle of curing one error by adding another to be wrong, and aim by our improvement to avoid the cause of the trouble, which we do by giving a revolving motion to the ring itself in the same direction as that of the traveler, at a variable speed, so as to aid its slip, and reduce its friction on the ring. This we accomplish by means of a shaft with whorls on it, located directly over the drum for driving the spindle, from which bands drive each ring separately; and attached by cross-girts to the ring-rail, and moving up and down with it. This shaft is driven by a pair of conical drums from the main cylinder shaft, and is so arranged with a loose pulley on the large end of the receiving cone as to remain stationary while the wind is on or near the base of the bobbin, or nearly parallel to the path of the traveler. When the cone of the bobbin begins to diminish to such a point as to materially increase the radial pull on the traveler, these conical drums are put in operation by a belt shipper attached to the lift motion, which moves the belt on to the cones, and gives a continually accelerated motion to the rings, so that when the wind reaches the top of the bobbin the rings will have their maximum speed of about 300 revolutions per minute, or about one-twentieth the number of revolutions of the spindle at this point, if the latter make 6000 revolutions per minute, and this we find in actual practice to produce results which are highly satisfactory.