NATHAN READ
Read planned a steam-car to be run with his tubular boiler, and it is said that this vehicle, when laden with fifty tons weight, could make five miles per hour. The model which was completed in 1790 had four wheels, the front pair being pivoted at the center and controlled by a horizontal sheave and rope. The sheave was located back near the boiler, and in guiding the machine it was operated by a hand-wheel placed above the platform, within easy reach of the engineer. A square boiler with Read’s multi-tubular system, overhung at the rear of the carriage. Two driving-wheels were forward of the boiler, and in front of these were two horizontal cylinders on each side of the engine. On the inside of each wheel were ratched teeth that fitted into corresponding teeth on horizontal racks above and below the hub. The piston, moving back and forth from the cylinder, engaged these teeth and caused a revolution of the wheel. There were two steam valves and two exhaust valves to each cylinder, the exhaust being into the atmosphere. Although this was the first conception of propulsion by steam on land in America, Read went no further in creating this model, inasmuch as he received no encouragement from financial sources.
In 1796, Read established at Salem, Mass., the Salem Iron Foundry, where he manufactured anchors, chain cables, and other machinery. In January, 1798, he invented a machine to cut and head nails at one operation. He also invented a method of equalizing the action of windmills by accumulating the force of the wind through winding up a weight; and a plan for harnessing the force of the tides by means of reservoirs which, by being alternately filled up and emptied, created a constant stream of water. Among his other inventions were a pumping engine and a threshing machine.
Richard Trevithick
Born in Illogan, in the west of Cornwall, England, April 13, 1771. Died in Dartford, Kent, April 22, 1833.
Richard Trevithick had meager educational advantages. His father was manager of the Dolcoath and other mines, and shortly after the birth of his son moved to Penponds, near Camborne, where the boy was sent to school to learn reading, writing and arithmetic, which were the limits of his attainments. Early in life he showed the dawning of remarkable inventive genius, was quick at figures and clever in drawing. He developed into a young man of notable physique, being six feet two inches high, and having the frame and the strength of an athlete. He was one of the most powerful wrestlers in the west country, and it is related of him that he could easily lift a thousand-weight mandril.
At the age of eighteen young Trevithick began to assist his father as mine manager, and at once proceeded to put his inventive faculty to practical test. His initial success, in 1795, was an improvement upon an engine at the Wheal Treasury mine, which accomplished a great saving in fuel and in power, and won for him his first royalty. Before his father died, in 1797, he had attained to the position of engineer at the Ding Dong mine, near Penzance, and had already set up at the Herland mine the engine built by William Bull, with improvements of his own. His earliest invention of importance was in 1797, when he made an improved plunger pump, which, in the following year, he developed into a double-acting water-pressure engine. One of these engines, set up in 1804, at the Alport mine, in Derbyshire, was run until 1850.
