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Posted by on Aug 23, 2017 in Tell Me Why |

Who Was Thomas Newcomen?

Who Was Thomas Newcomen?

Thomas Newcomen (1664-1729) was the English inventor of the only practical steam engine in use from the early to late 18th century. He was the predecessor of the much more famous James Watt (1736-1819), whose improvements created the modern steam engine. Newcomen, who was born at the port of Dartmouth, Devon, England, became an ironmonger and Baptist preacher.

Thomas Newcomen was a lay preacher and a teaching elder in the local Baptist church. After 1710 he became the pastor of a local group of Baptists. His father had been one of a group who brought the well-known Puritan John Flavelto Dartmouth. Later one of Newcomen’s business contacts in London, Edward Wallin, was another Baptist minister who had connections with the well-known Doctor John Gill of Horsleydown, Southwark. Newcomen’s connection with the Baptist church at Bromsgrove materially aided the spread of his steam engine, as the engineers Jonathan Hornblower (both father and son) were involved in the same church.

He developed a keen interest in steam engines, especially in a machine made by Thomas Savery, an English naval captain, in 1698. Savery had incorporated some of the ideas of Denis Papin, a French Huguenot inventor, into a water-raising engine in which the steam acted directly on the water to be raised. It was Savery’s machine that led Newcomen to complete his own engine. Newcomen sprayed cold water onto a steam-filled cylinder to create a vacuum so that atmospheric pressure forced the piston down and the water up. Although fairly effective, the pumps were wasteful of coal. They also needed constant attention, for the valves had to be opened and closed by hand.

Nevertheless his invention was used for a good many years from 1712, especially for pumping water out of mines. One steam engine was even sent to Russia in 1775 to pump out the dry docks at Kronstadt. In those days flooding in coal and tin mines was a major problem, and Newcomen was soon engaged in trying to improve ways to pump out the water from such mines. His ironmonger’s business specialised in designing, manufacturing and selling tools for the mining industry.

Newcomen’s great achievement was his steam engine, developed around 1712; combining the ideas of Thomas Savery and Denis Papin, he created a steam engine for the purpose of lifting water out of a tin mine. It is likely that Newcomen was already acquainted with Savery, whose forebears were merchants in south Devon. Savery also had a post with the Commissioners for Sick and Hurt Seamen, which took him to Dartmouth. Savery had devised a “fire engine”, a kind of thermic syphon, in which steam was admitted to an empty container and then condensed. The vacuum thus created was used to suck water from the sump at the bottom of the mine. The “fire engine” was not very effective and could not work beyond a limited depth of around thirty feet.

Newcomen replaced the receiving vessel (where the steam was condensed) with a cylinder containing a piston based on Papin’s design. Instead of the vacuum drawing in water, it drew down the piston. This was used to work a beam engine, in which a large wooden beam rocked upon a central fulcrum. On the other side of the beam was a chain attached to a pump at the base of the mine. As the steam cylinder was refilled with steam, readying it for the next power stroke, water was drawn into the pump cylinder and expelled into a pipe to the surface by the weight of the machinery. Newcomen and his partner John Calley built the first successful engine of this type at the Conygree Coalworks near Dudley in the West Midlands. A working replica of this engine can be seen at the Black Country Living Museum nearby.

newcomen's later life

Comparatively little is known of Newcomen’s later life. After 1715 the engine affairs were conducted through an unincorporated company, the ‘Proprietors of the Invention for Raising Water by Fire’. Its secretary and treasurer was John Meres, clerk to the Society of Apothecaries in London. That society formed a company which had a monopoly on supplying medicines to the Navy providing a close link with Savery, whose will he witnessed. The Committee of the Proprietors also included Edward Wallin, a Baptist of Swedish descent; and pastor of a church at Maze Pond, Southwark. Newcomen died at Wallin’s house in 1729, and was buried at Bunhill Fields burial ground on the outskirts of the City of London: the exact site of his grave is unknown.

By 1733 about 125 Newcomen engines, operating under Savery’s patent (extended by statute so that it did not expire until 1733), had been installed by Newcomen and others in most of the important mining districts of Britain and on the Continent of Europe: draining coal mines in the Black Country, Warwickshire and near Newcastle upon Tyne; at tin and copper mines in Cornwall; and in lead mines in Flintshire and Derbyshire, amongst other places.

Content for this question contributed by Abraham Pearce, resident of Santa Cruz, Santa Cruz County, California, USA