Water turbine like a true turbine. Fausto Veranzio in his book "Machinae Novae" (1595) described a vertical axis mill with a rotor similar to that of a Francis turbine. Johann Segner developed a reactive water turbine (Segner wheel) in the mid-18th century in Kingdom of Hungary. It had a horizontal axis and was a precursor to modern water turbines. It is a very simple machine that is still produced today for use in small hydro sites. Segner worked with Euler on some of the early mathematical theories of turbine design. In the 18th century, a Dr. Robert Barker invented a similar reaction
Gas turbine system technician Gas turbine system technician Gas turbine systems technicians (abbreviated as GS) is a United States Navy occupational rating. Gas turbine systems technicians (electrical) (GSE) operate, repair, and perform organizational and intermediate maintenance on electrical components of gas turbine engines, main propulsion machinery, auxiliary equipment, propulsion control systems, assigned electrical and electronic circuitry up to the printed circuit and alarm and warning circuitry. Gas turbine systems technicians (mechanical) (GSM) operate, repair, and perform organizational and intermediate maintenance on mechanical components of gas turbine engines, main propulsion machinery (including gears, shafts, and controllable pitch propellers), assigned auxiliary equipment and propulsion control systems.