ater or steam, acting in the reverse direction to a refrigerant, would be adapted to increase the effect of the air as an expansive motor.
Alternate expansion and contraction was the whole principle of the M. I. Brunel Gas-Engine Patent, England, 1804. Heated carbonic-acid gas is preferable to air for developing a large force in small space.
See gasengine. See also air-engine; compressed-air engine; air as A water-elevator.
In marine engines; to receive the gases which entirs communicating with the cylinder on the respective sides of the piston; the air in said reservoir being alternately heated and cooled to change its expansive force and thus reciprocate the piston.
This was the form of Brunel's engine, British, 1804; and Stirling's, British, 1827; and Peters's, 1862.
Those engines in which water or steam is mingled with the air to moisten it and keep the working parts from abrasion; in some cases being introduced in quantity to be positively co-opera
The lace-making machine for weaving the real twisted lace, like that made on the pillow, was invented by Heathcoat, 1804.
The groundwork of the invention is to extend those threads which form the warp of the lace in parallel lines, and dispes to the mile, was finished by Sir Hugh Middleton, and the water was distributed by wooden mains and leaden branches.
In 1804, cast-iron pipes were substituted for the wooden mains.
Lead-pipe is made by casting, drawing, pressing, and rolling.
The first attempts in this direction were by Alderson in England, who patented his invention in 1804, which consisted in putting an interior casing of tin pipe within the leaden one.
Dobbs, in 1820, gave a coating of res
In 1789, Mr. Greathead of South Shields invented his boat, which proved so successful that it is said that previous to 1804 nearly 300 lives had been saved through its instrumentality near the mouth of the Tynemouth Haven.
This boat was about