Fig. 120.—The Latta Steam Fire-Engine.
As early as 1830, Braithwaite and Ericsson, of London, England, built an engine with steam and pump cylinders of 7 and 61∕2 inches diameter, respectively, with 16 inches stroke of piston. This machine weighed 21∕2 tons, and is said to have thrown 150 gallons of water per minute to a height of between 80 and 100 feet. It was ready for work in about 20 minutes after lighting the fire. Braithwaite afterward supplied a more powerful engine to the King of Prussia, in 1832. The first attempt made in the United States to construct a steam fire-engine was probably that of Hodge, who built one in New York in 1841. It was a strong and very effective machine, but was far too heavy for rapid transportation. The late J. K. Fisher, who throughout his life persistently urged the use of steam-carriages and traction-engines, designing and building several, also planned a steam fire-engine. Two were built from his design by the Novelty Works, New York, about 1860, for Messrs. Lee & Larned. They were “self-propellers,” and one of them, built for the city of Philadelphia, was sent to that city over the highway, driven by its own engines. The other was built for and used by the New York Fire Department, and did good service for several years. These engines were heavy, but very powerful, and were found to move at good speed under steam and to manœuvre well. The Messrs. Latta, of Cincinnati, soon after succeeded in constructing comparatively light and very effective engines, and the fire department of that city was the first to adopt steam fire-engines definitely as their principal reliance. This change has now become general.
The steam fire-engine has now entirely displaced the old hand-engine in all large cities. It does its work at a fraction of the cost of the latter. It can force its water to a height of 225 feet, and to a distance of more than 300 feet horizontally, while the hand-engine can seldom throw it one-third these distances; and the “steamer” may be relied upon to work at full power many hours if necessary, while the men at the hand-engine soon become fatigued, and require frequent relief. The city of New York has 40 steam fire-engines. One engine to every 10,000 inhabitants is a proper proportion.
Fig. 121.—The Amoskeag Engine. Section.
In the standard steam fire-engine ([Fig. 120]) reciprocating engines and pumps are adopted, as seen in section in [Fig. 121], in which A is the furnace, and B the set of closely-set vertical fire-tubes in the boiler. C is the combustion-chamber, D the smoke-pipe, and R the steam-space. E is the steam-cylinder, and F the pump, which is seen to be double-acting. There are two pairs of engines and pumps, working on cranks, set at right angles, and turning a balance-wheel seen behind them. G is the feed-pump which supplies water to the boiler, H the air-chamber which equalizes the water-pressure, which reaches it through the pipe, I J. K is the feed-water tank, under the driver’s seat, L, which, with the engines and boiler, are carried on the frame, M M. The fireman stands on the platform, N. When it is necessary to move the machine, an endless chain connects the crank-shaft with the rear-wheels, and the engine, with pumps shut off, is thus made to drive the wheels at any desired speed.
A self-propelling engine by the Amoskeag Company had the following dimensions and performance: Weight, 4 tons; speed, 8 miles per hour; steam-pressure, 75 pounds per square inch; height of stream from 11∕4-inch nozzle, 225 feet; 13∕4-inch nozzle, 150 feet; distance horizontally, 11∕4-inch nozzle, 300 feet; 13∕4-inch, 250 feet—a performance which contrasts wonderfully with that of the hand-worked fire-engine which these engines have now superseded.