REGULATION OF STEAM.

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counter weight, keyed and fixed to an arm on the reversing shaft.Instead of parallel motion for keeping the lifting rod in a verticalline, a plain cast-iron guide is at times adopted, having a slidingblock for taking the lifting pin, and the reversing levers, similar to

Fig\ 60.—Link Motion and Starting Gear for Marine Engines.

the foregoing example, fitted with a short link for connecting thereversing arm and sliding block; the lifting rod being attached tothe pin on block and main link, doing away with the top arm, as inthe previous example. In some designs the link is not suspendedfor the forward movement, but simply rests on the slide block.When the link is full down, the lifting pin on the arm passingthrough a short slotted hole in the rod, the pin being free to move inthe slot to suit the Vibration of the link, there is neither upward nordownward movement in the link, as it is always resting on the slide-block for the forward movement, the pin in the elongated holeaccommodating itself to the versed sine of the lifting rod. Anothermode of lifting the link is by means of a screwed rod placed verti-cally (Fig. 61), having bevel-gear overhead in connection with thestarting-wheel. On the screwed part of the vertical shaft at thebottom is fitted a nut, having two pins, for taking the short links thatare fitted to the lifting arm, the lifting rod for the main link beingjointed thereto; the pin is placed between the end and the centre ofVibration of the lifting arm. The shaft for the lifting arm passesacross the engine, having merely a plain lever and rod at the otherend for actuating the main link.

A variety of other examples suited for the slotted link as well

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