STATIONARY ENGINES.

277

The air pump is worked by means of a crosshead with connecting

rods from the side levers; theplug rod for the valve me-chanism is a continuation ofthe air pump rod, guided atthe top with a bracket fitted tothe nozzle ehest. It is essen-tial for this dass of engine tohave a travelling crane fittedoverhead, so as to lift the pis-tons, &c., for inspection orrepair.

VERTICAL BLOWING ENGINES.

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Another example is thevertical direct-acting high-pressure engine, which dififersmaterially from the foregoingin having no side levers orbeams. The blowing cylin-ders are placed on the groundfloor, four strong cast-ironpillars are securely fitted, oneat each corner, and carried upto the top of the house, withcross girders for carrying thesteam cylinder and fly-wheelshaft. The blowing cylinderis 10 8% inches in diameter,and the steam cylinder, placedoverhead, is 47% inches indiameter; the stroke of eachis 6 feet 6y^ inches. The fly-wheel shaft is 25 feet 10 inchesabove the floor of the engine,and the total height from thebase to the cen.tre of the crankshaft is about 44 feet 3 inches.

The crank is connected by a rod to

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185.—Vertical Blowing Engine at the Creuzot IronWorks, dep. Saöne-et-Loire , France .

A, Blowing cylinder. b, Steam cylinder. c, Crank shaft.d, Fly wheel. e, Bottom of air cylinder. f f, Pillars.

crosshead working in guides,