From this date forward, during several years, a number of inventors and mechanics seem to have devoted their whole time to this promising scheme. Among them, Burstall & Hill, Gurney, Ogle & Summers, Sir Charles Dance, and Walter Hancock, were most successful. Gurney, in the year 1827, built a steam-carriage, which he kept at work nearly two years in and about London, and sometimes making long journeys. On one occasion he made the journey from Meksham to Cranford Bridge, a distance of 85 miles, in 10 hours, including all stops. He used the mechanical legs previously adopted by Brunton and by Gordon, but omitted this rude device in those engines subsequently built. Gurney's engine of 1828 is of interest to the engineer as exhibiting a very excellent arrangement of machinery, and as having one of the earliest of "sectional boilers." The latter was of peculiar form, and differed greatly in design from the sectional boiler invented a quarter of a century earlier by John Stevens, in the United States. [Illustration: FIG. 48.--Gurney's Steam-Carriage.] In the sketch (Fig. 48) this boiler is seen at the right. It was composed of bent [<]-shaped tubes, _a a_, connected to two cylinders, _b b_, the upper one of which was a steam-chamber. Vertical tubes connected these two chambers, and permitted a complete and regular circulation of the water. A separate reservoir, called a separator, _d_, was connected with these chambers by pipes, as shown. From the top of this separator a steam-pipe, _e e e_, conveyed steam to the engine-cylinders at _f_. The cranks, _g_, on the rear axle were turned by the engines, and the eccentric, _h_, on the axle drove the valve-gearing and the valve, _i_. The link, _k l_, being moved by a line, _l l_, led from the driver's seat, the carriage was started, stopped, or reversed, by throwing the upper end of the link into gear with the valve-stem, by setting the link midway between its upper and lower positions, or by raising it until the lower end, coming into action on the valve-stem, produced a reverse motion of the valve. The pin on which this link vibrated is seen at the centre of its elliptical strap. The throttle-valve, _o_, by which the supply of steam to the engine was adjusted, was worked by the lever, _n_. The exhaust-pipe, _p_, led to the tank, _q_, and the uncondensed vapor passed to the chimney, _s s_, by the pipe, _r r_. The force-pump, _u_, taking feed-water from the tank, _t_, supplied it to the boiler by the pipe, _x x x_, which, _en route_, was coiled up to form a "heater" directly above the boiler. The supply was regulated by the cock, _y_. The attendant had a seat at _z_. A blast-apparatus, 1, was driven by an independent engine, 2 3, and produced a forced blast, which was led to the boiler-furnace through the air-duct, 5 5; 4 4 represents the steam-pipe to the little blowing-engine. The steering-wheel, 6, was directed by a lever, 7, and the change of direction of the perch, 8,