traverses the slot in the link, and which pin projects from a cross head to which the two rods of the valve are attached. The brass is made to traverse the slot by lifting up the link by means of a vertical rod, the upper end of which is screwed, and upon which a nut is rotated by a pair of small bevel wheels moved by a hand wheel. In each of the arrangements the weight of the link is balanced by a counterweight, so that the link is movable with equal facility in the upward and downward directions. STARTING CYLINDERS. In the larger class of marine engines the links are now very generally moved by means of a separate cylinder and piston devoted to the special purpose of moving the starting gear. The starting cylinder employed in the steamers 'Ulster' and 'Munster' is shown in fig. 25. The links of both engines are moved in or out simultaneously by rods connecting them with the cross head of a small starting engine, which is formed without a crank; and the piston rod is made hollow, with a screw working in it, which screw may be turned by the hand wheel shown at the top of the figure, if necessary, to assist the in or out motion of the piston. Such assistance, however, is seldom required; but on the contrary, the piston in its motion to and fro puts the wheel into revolution, like the fly of a roasting-jack, first in one direction and then in the other; and any jerk, |