Claim: The Turgo turbine(designed in 1919 by Gilkes) is an impulse water turbine with an 87% efficiency that operates at higher flow rates than the Pelton turbine.
Evidence: Designed in 1919 by Gilkes as a modification of the Pelton wheel, the Turgo has some advantages over Francis and Pelton designs for certain applications. The Turgo turbine is an impulse water turbine designed for medium head applications. Operational Turgo Turbines achieve efficiencies of about 87%. Third, it has higher specific speed and can handle a greater flow than the same diameter Pelton wheel, leading to reduced generator and installation cost.