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At IV., Fig. I., the “catches” for turning the cylinder at the lantern are illustrated. The distance of the centre of the screws which hold the catches to the frame is 4–¾ inches. Between these two catches the cylinder is adjusted to the batten, and the direction of its turning is regulated by the catch which is brought in contact with the lantern. If the catch, y, turns, the cylinder will turn the card situated on its top towards the needle-board, and if catch, z, is brought into contact with the lantern, the card hanging below the needle-board will be the next in turn to be pushed towards the needles.

The entire length of the catches in the present illustration is 8 ins., allowing 5–¼ ins. for the catch itself and 2–¾ ins. for the part to which it is fastened. Making this catch in two pieces is preferable to the old style of one piece, because the moment of turning the cylinder can be more easily regulated.