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as compared with engines of other builds, because of its great simplicity in the valve gear, and general excellence of design and construction.

TRENTON ENGINE-CLASS C. AUTOMATIC CUT-OFF.

General Description.

Figs. 49, 50, 51.

The intention of the builders to have the general design of the different classes of engines similar, has been extended to Class C; the bed or frame corresponding to those already described. The valve gear differs from those of the other classes as follows:

The valves are two in number and are placed transversely across the bottom of the cylinder. They are of the Corliss or rotary type, improved by patent double ports.

They are rotated by an eccentric and wristplate, which opens the valves for the admission of steam to the cylinder very quickly, and retards their closing during the exhaust; both important factors in the economical distribution of steam in a cylinder.

We direct especial attention to the valves as illustrated by Fig. 51.

It will be seen that there is obtained double the amount of port opening in the earlier parts of

the stroke, than is found in any other valve of this character.

This insures the highest initial steam pressure in the cylinder, and tends towards the greatest economy of steam, and consequently of fuel.

The speed and power of this class are regulated by a centrifugal governor on the crank shaft, similar to that used for Class B engines.

These engines are designed for high speed with a varying intensity of load.

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VERTICAL LONGITUDINAL SECTION THROUGH CYLINDEK

ANI) VALVES. FULL PORT AT 27 OF STROKE.

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