Matthew Henry Phineas Riall Sankey

Matthew Henry Phineas Riall Sankey (November 9, 1853 - October 3, 1926) was an Irish engineer and captain of the British Army, known as creator of the Sankey diagram

Biography
Sankey was born in County Tipperary in 1853 as son of General W. Sankey, C.B. He received his first education in Switzerland and back in Ireland at the Mr. Rippon’s School at Woolwich. Here from 1871 to 1873 he attended the Royal Military Academy, and from 1874 to 1876 the School of Military Engineering in Chatham.

In the last years of his studies Sankey started as research-assistant of the Royal Commission on Railway Accidents making calculations and experiments on railway-brakes and trails. After graduation he started at the British Army, first on the War Office on architectural design, then leading a drawing office of 16 draughtsman in Manchester. In Gibraltar he was superintended at the construction of barracks for a Military Telegraphs station. From 1879 to 1882 he was instructor at the Royal Military College, Kingston, Canada, and from 1882 to 1889 back in England working for the Ordnance Survey Establishment at Southampton.

From 1889 to 1904 he was board member of Willans and Robinson Ltd. engineers, become the lead engineer and steam engine designer in 1892 after Mr. Willans died. Later he designed the new plant Victoria Works at Rugby. From 1904 to 1909 he was a consulting engineer at steam and internal-combustion engineering industry. And from 1909 until his death in 1926 he was board member at Marconi’s Wireless Telegraph Company, Ltd, and in the board of some other companies.

In World War I Sankey volunteered serving as staff officer at the department of the Director of Fortifications and Works. He was decorated with the Order of the Bath (CB) and the Order of the British Empire (CBE) for his service in World War I.

He was also President of the Institution of Mechanical Engineers.

Sankey diagram
In an 1898 article about the energy efficiency of a steam engine in the Minutes of Proceedings of The Institution of Civil Engineers Sankey introduced the first energy flow diagram: a visualisation to be christened Sankey diagram. Sankey gave the following explanation how to read the image:


 * "No portion of a steam plant is perfect, and each is the seat of losses more or less serious. If therefore it is desired to improve the steam plant as a whole, it is first of all necessary to ascertain separately the nature of the losses due to its various portions; and in this connection the diagrams in Plate 5 have been prepared, which it is hoped may assist to a clearer understanding of the nature and extent of the various losses. The boiler; the engine; the condenser and air-pump; the feedpump and the economiser, are indicated  by rectangles upon the diagram. The flow of heat is shown as a stream, the width of which gives the amount of heat entering and leaving each part of the plant per unit of time; the losses are shown by the many waste branches of the stream. Special attention is called to the one (unfortunately small) branch which represents the work done upon the pistons of the engine."

This presentation made an impression. Just four years later in 1902 Robert Henry Thurston among others acknowledged, that the heat distribution of the then modern steam engine was best shown by the use of the so-called "Sankey Diagram".

Patents
Sankey received at least four patents for an expansion-gear for engines (1894), a turbine (1905), a reversible turbine (1907), and a steam-turbine (1907).

Publications
Books:
 * 1879. Elementary theory and calculation of iron bridges and roofs. English translation of August Ritter's German book of 1863.
 * 1898. Temperature Entropy Or [theta Phi] Chart for 1 Lb. of H2O: Giving Also Volumes, Absolute Pressures and Dryness Fractions, Internal Energy, Water Heat, and Total Heat in British Thermal Units. Frost & Sons
 * 1911. Gas engines. with William Johnstone Marshall
 * 1907. The Energy Chart: Practical Applications to Reciprocating Steam-engines. E. & F.N. Spon

Articles, a selection:
 * 1888. "The Maps of the Ordnance Survey: a mid-Victorian view". in: Engineering, a weekly illustrated journal. Charles Close Society London. Republished in 1995.
 * 1896. "The Thermal Efficiency of Steam-Engines". In: Minutes of Proceedings of the Institution of Civil Engineers 125, 1896, S. 182–242.
 * 1898. "Introductory Note on the Thermal Efficiency of Steam-Engines". in: Minutes of Proceedings of the Institution of Civil Engineers. Vol. 134, p. 278–283