Page:Popular Science Monthly Volume 18.djvu/504

488 stopping, no attention whatever being given to it in that time. It is said to have gone quite largely into use in France, but it has not yet made its appearance in the American market.

In the engine as shown in the engraving, the cylinder is placed upright, and it and the base-plate are cast in one piece. A number of

ribs upon the former increase the radiating surface to such an extent that a water-jacket is unnecessary. The motor can therefore be readily moved from one place to another, an advantage of considerable value in the uses for which it is intended. The mixture of gas and air is admitted and discharged at the lower end of the cylinder through an opening, alternately placed in communication with the gas-supply and exhaust by a sliding valve. The firing of the gaseous charge is done by means of two gas-jets, shown on the right side of the engine. The lower one remains permanently lit, and serves to relight the upper one, which is extinguished at each ignition in the cylinder. This latter is placed directly opposite a small opening in the cylinder at about