Abstract: A power-producing system in which a turbine and generator are hermetically sealed in a housing which can be pressurized to regulate at optimum evaporation conditions of a low-boiling fluid which is circulated through the turbine in a closed cycle including the heat exchanger for vaporizing the fluid and utilizing low thermal power such as solar power, waste heat and terrestrial heat. The cycle also includes, where necessary, a pump which may be received in the hermetically sealed housing and a further heat exchanger acting as a condenser.

Abstract: A method of controlling electrical discharge machining in which a machining discharge is initiated and the particular geometric characteristic of the site of the discharge is ascertained by detecting at least one of the gap variables over a predetermined checking period of the discharge and evaluated with respect to a reference value. A parameter of the discharge, e.g. duration and/or current magnitude is established at a particular value preset to correspond to a particular geometric characteristic and the discharge is terminated in accordance with the regulated parameter.