This is an excellent example of this kind of engine as constructed at the present time. The strongly-built boiler, with its heater, the jacketed cylinder, and light, strong frame of the engine, the steel running-gear, the carefully-covered surfaces of cylinder and boiler, and excellent proportions of details, are illustrations of good modern engineering, and are in curious contrast with the first of the class, built a century earlier by Smeaton. Steam-carriages for passengers are now rarely built. Fig. 118 represents that designed by Fisher about 1870 or earlier. It was only worked experimentally. [Illustration: FIG. 119.--Road and Farm Locomotive.] The above is an engraving of a road and farm locomotive as built by one of the most successful among several British firms engaged in this work. The capacity of these engines has been determined by experiment by the author in the United States, and abroad by several distinguished engineers. The author made a trial of one of these engines at South Orange, N. J., to determine its power, speed, and convenience of working and man[oe]uvring. The following were the principal dimensions: Weight of engine, complete, 5 tons 4 cwt. 11,648 pounds. Steam-cylinder--diameter 7-3/4 inches. Stroke of piston 10 inches. Revolution of crank to one of driving-wheels 17 Driving-wheels--diameter 60 inches. " breadth of tire 10 inches. " weight, each 450 pounds. Boiler--length over all 8 feet. " diameter of shell 30 feet. " thickness of shell 7/16 inch. " fire-box sheets, outside, thickness 1/2 inch. Load on driving-wheels, 4 tons 10 cwt. 10,080 pounds. The boiler was of the ordinary locomotive type, and the engine was mounted upon it, as is usual with portable engines. The steam-cylinder was steam-jacketed, in accordance with the most advanced practice here and abroad. The crank-shaft and other wrought-iron parts subjected to heavy strains were strong and plainly finished. The gearing was of malleableized cast-iron, and all bearings, from crank-shaft to driving-wheel, on each side, were carried by a single sheet of half-inch plate, which also formed the sides of the fire-box exterior.