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This sleeve n has frictional contact at p with the bar q, whose lower end receives the bell crank r, which on each return stroke is depressed, and thus moves the tool apron s, and with it the tool, which is therefore relieved from contact with the cut upon the work.

This engagement is effected by means of a bell crank k, operated by a shipper rod k1 on which adjustable dogs are placed, arranged to be operated by the cutter slide f.

The shoes are in the form of a bell crank, upon the exposed end of which is provided a small lug, clearly shown in the cut.

The starting bar is shown in position to start the engine, and it is seen that the rod a and bell crank b are in such a position as to open the valve t, and thus admit steam from the dome to the pipe e, whence it passes through pipes f, g and r into the steam chest i, the slide valve v distributing the steam to the cylinder.

The ash pan is provided with two dampers, one at each end, and the front one is operated by the bell crank a c.