184

MODERN STEAM PRACTICE.

shut off, and the piston nearly at the end of the up stroke; theremaining exhaust steam in the top blows the water and Condensed

Fig. 116.—Overhead-beam Pumping Engine. Side Elevation.

steam out of the blow-through valves at the bottom of the condenserinto the overflow cistern, from which it is led into a drain. Inworking, the water in the condenser rises to nearly the level of the