Charles Algernon Parsons, English-Irish engineer, invented the steam turbine (born 1854)

Sir Charles Algernon Parsons was an Anglo-Irish mechanical engineer and inventor who designed the modern steam turbine in 1884. His invention revolutionised marine propulsion, and he was also the founder of C. A. Parsons and Company. He worked as an engineer on dynamo and turbine design, and power generation, with great influence in the naval and electrical engineering fields. He also helped develop optical equipment for searchlights and telescopes. Parsons received the Franklin Medal in 1920, the Faraday Medal in 1923, and the Copley Medal in 1928 for his work, as well as the Engineering Heritage Awards posthumously in 1995.

A steam turbine or steam turbine engine is a machine or heat engine that extracts thermal energy from pressurized steam and uses it to do mechanical work utilising a rotating output shaft. Its modern manifestation was invented by Sir Charles Parsons in 1884. It revolutionized marine propulsion and navigation to a significant extent. Fabrication of a modern steam turbine involves advanced metalwork to form high-grade steel alloys into precision parts using technologies that first became available in the 20th century; continued advances in durability and efficiency of steam turbines remains central to the energy economics of the 21st century. The largest steam turbine ever built is the 1,770 MW Arabelle steam turbine built by Arabelle Solutions, two units of which will be installed at Hinkley Point C Nuclear Power Station, England.

February 11 is the 42nd day of the year in the Gregorian calendar; 323 days remain until the end of the year.