Pennsylvania Opera Theater di San Domingo" (1982), Weil's "The Threepenny Opera" (1984), Britten's "The Turn of the Screw" (1987), Henry Purcell's "The Fairy-Queen" (1988), and Robert Ward's "The Crucible" (1989). The company's final performance was of Mozart's "Così fan tutte" on May 14, 1993 at the Merriam Theater with Jennifer Jones as Fiordiligi, Janine Hawley as Dorabella, Matthew Lau as Guglielmo, Robert Baker as Ferrando, Sara Seglem as Despina, and Robert Holden as Don Alfonso. Pennsylvania Opera Theater The Pennsylvania Opera Theater (TPOT) was an American opera company located in Philadelphia, Pennsylvania. Founded in 1975 by Barbara Silverstein, the company presented an annual
Screw turbine Screw turbine The screw turbine is a water turbine which uses the principle of the Archimedean screw to convert the potential energy of water on an upstream level into work. It may be compared to the water wheel. The turbine consists of a rotor in the shape of an Archimedean screw which rotates in a semicircular trough. Water flows into the turbine and its weight presses down onto the blades of the turbine, which in turn forces the turbine to turn. Water flows freely off the end of the turbine into the river. The upper end of the screw is