The following diagram presents an outline of an arrangement for avoiding this, and producing a double action, a a are the vapour vessels; b is the piston cylinder; c the piston working horizontally. The arrangement of the lamps, injecting tubes, etc. is upon the same principle as before. The vapour is alternately generated with the two vessels a a, and withdrawn from them, and acts upon the piston through the medium of the oil or other fluid, upon which, or upon the thin copper floats d d, the small quantity of fluid to be evaporated is injected, as before described. The patentee states that aether or essential oils might be substituted for alcohol, although he considers the latter preferable upon the whole, as it is more readily and effectually condensed. We have seen an alcoholic engine, intended for a 24-horse power, in occasional operation at the Iron Works at Rotherhithe, where the patentee perseveringly continues his experimental efforts on the great scale.

Fig. 1.

Fig. 2.