Claim: The Turgo turbine is an  impulse water turbine designed in 1919 by Gilkes as a modification of the Pelton wheel, with an 87% efficiency
Evidence: The Turgo turbine is an impulse water turbine designed for medium head applications. 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. Operational Turgo Turbines achieve efficiencies of about 87%. In factory and lab tests Turgo Turbines perform with efficiencies of up to 90%.