STATIONARY ENGINES.

*93

same size; it is usual to make the ‘pumps’ or rising main the samesize as the plunger. The adit is 31 fathoms below the surface, and

Sectimstkrc’ Zine D £

Fig. 123.—Pumps for Direct-acting Engine.a, Forcing set. bb, Lifting sets. c, Stand pipe with air vessel.

conducts the water delivered from the pumps into the adjoiningvalley. Of course it is an advantage to have the adit as deep aspossible, that the engine may have the minimum amount of work

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