Abstract: The arrangement comprises a turbine wheel having semicircular buckets milled into the periphery thereof and a steam or gas-discharging nozzle operatively associated therewith, according to prior art practices, in which an improved, efficiency-enhancing ratio of bucket radius to nozzle width is set forth, defined and depicted.

Abstract: The system comprises a zirconium sensor interposed in the exhaust conduit of a gas-fueled engine for sensing both oxygen content and temperature of the exhaust gases, and for emitting electrical analog signals thereof to a comparator/controller. In turn, the latter transmits a complementary, derivative electrical signal to a current-to-pressure transducer. The transducer is supplied with gas under pressure, from the engine fuel (gas) supply line, and the pressure of this transducer-supplied gas is modulated by the aforesaid derivative signal. The modulated gas pressure is communicated with a gas cylinder, having a translating piston rod, which is operatively engaged with an otherwise standard gas engine regulator for trimming control of the flow of fuel (gas) through the regulator.