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Robert Stirling

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Reverend Dr Robert Stirling (1790-1878) was a Scottish clergyman, and co-inventor of a highly efficient heat engine. Nearly all closed-cycle regenerative gas engines are Stirling Engines (also see Ericsson cycle).

Robert's brother James Stirling (1800-1876), also an engineer, built a large air engine at his Dundee Foundry Co.

1790 October 25th. Born at Cloag Farm near Methven, Perthshire in Scotland, the third of eight children of Peter Stirling, a farmer at Cloag. Michael Stirling, Robert's grandfather, was the inventor of a threshing machine

He inherited his father's interest in engineering

1805-06 He studied divinity at the University of Edinburgh

1816 He became a minister of the Church of Scotland.

He soon became concerned about the danger the workers in his parish faced from steam engines, which frequently exploded because of the poor quality of the iron boilerplate available at the time, and decided to improve the design of an existing air engine in the hope that it would provide a safer alternative. Within a year he invented a regenerator, which he called the Heat Economiser, a device for improving the efficiency of an air engine.

1817 He obtained a patent for the economiser, and an air engine incorporating it. Stirling's engine could not explode, because it worked at a lower pressure, and could not cause steam burns.

1816 Specification of Stirling's Patent No. 4081 [1]

1818 Built the first practical version of his engine, used to pump water from a quarry.

1819 Stirling married Jean Rankin. They had seven children.

1820 June 29th. Birth of son Patrick Stirling

Later, in Kilmarnock, he collaborated with another inventor, Thomas Morton, who provided workshop facilities for Stirling's research. Both men were interested in astronomy, and having learnt from Morton how to grind lenses, Stirling invented several optical instruments.

c.1830 Birth of son William Stirling

1835 October 2nd. Birth of son James Stirling

1851 Living at Galston Manse: Robert Sterling (sic) (age 60 born Methven, Perthshire), Minister of Galston. With his wife Jane (age 50 born Kilmarnock) and their children Jane (age 29 born Kilmarnock), James (age 15 born Galston), and Agnes (age 12 born Galston). Two servants.[2]

1861 Living at Galston: Robert Sterling (sic) (age 70 born Methven, Perthshire), Minister of Parish Church Galston. With his wife Jane (age 60 born Kilmarnock, Ayrshire) and their children Jane (age 39 born Kilmarnock) and James (age 25 born Galston), Engine Smith. Two servants.[3]

1871 Living at Galston: Robert Sterling (sic) DD (age 80 born Methven, Perthshire), Minister of the Parish. With his wife Jane (age 70 born Kilmarnock) and their daughter Jane (age 48 born Kilmarnock). Two servants.[4]

In a letter of 1876, Robert Stirling acknowledged the importance of Henry Bessemer's new invention – the Bessemer process for the manufacture of steel – which made steam engines safer and threatened to make the air engine obsolete. However, he also expressed a hope that the new steel would improve the performance of air engines.

1878 June 6th. Stirling died in Galston, East Ayrshire. The theoretical basis of Stirling's engine, the Stirling cycle, would not be fully understood until the work of Sadi Carnot (1796–1832). Carnot produced (and published in 1825) a general theory of heat engines, the Carnot cycle, of which the Stirling cycle is a particular case.

1878 Obituary [5]

DR. STIRLING.- The Rev. Dr. Stirling, the inventor of the hot-air engine, died in June, in his 88th year, having been born in the year 1790, near Methven, in Perthshire. Educated at St. Andrews, he was licensed to preach by the Presbytery of Dumbarton in the year 1815; and in the following year he received a presentation from the Commissioner of the Duke of Portland to the Kilmarnock second charge.

In the year 1824 he was translated to the neighbouring parish of Galston, where the living was in the gift of the same patron; and there he lived And laboured during the remainder of his long ministerial career, which in all extended over a period of sixty-three years.

The honorary degree of D.D. was conferred upon Mr. Stirling in the year 1840 by the University of St. Andrews, in recognition of his scholarly and scientific attainments, which were of an unusually high order.

Dr. Stirling was decidedly of a mechanical turn of mind, and indeed there seems to have been a special bent in that direction in the family. His brother, Mr. James Stirling, was a very accomplished engineer; and of his sons no fewer than three have inherited his taste for mechanical pursuits, and have become well known in railway engineering, their honourable positions being due alike to their professional abilities, and to the possession of much resolute and independent spirit, such as specially distinguished their father's character.

The eldest son, Mr. Patrick Stirling, was for a long time the locomotive superintendent on the Glasgow and South-Western Railway, with headquarters at Kilmarnock, and is now well known on this side of the Border as the locomotive superintendent of the Great Northern Railway.

The youngest son, Mr. James Stirling, succeeded Patrick in the service of the Glasgow and South-Western Railway Company, and has recently been appointed to a similar position on the South-Eastern Railway.

Another son, William, was engineer to the Lima and Callao, and is still in South America.

Like his brother James, the late Dr. Stirling early developed a remarkable taste for mathematics and mechanics, and, as already indicated, so early as the year 1816, when he was about twenty-six years of age, he invented and patented his air engine, which was afterwards improved somewhat by his brother James, and re-patented in 1827, and again in 1840.

In its best form Stirling's air engine was constructed at the Dundee Foundry in the year 1842, for the purpose of driving the machinery there; it had a working cylinder of 16 in. in diameter, with a stroke of 4 ft. The engine drove the machinery at the Dundee Foundry for several years at a very small cost for maintenance, there being little tear and wear of parts.

During his whole life mechanics formed the favourite pursuit of Dr. Stirling, and he constructed, with great neatness and dexterity, many optical and other scientific instruments. He also discharged the duties of his pastorate with great fidelity, and his upright, straightforward character won for him the esteem, not only of his own people, but also of the whole community who enjoyed the benefits of his public spirit and active benevolence.

1878 Obituary [6]

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