Abstract: A portable stoop ball striker comprising a generally A-shaped framework, which may be either a rigid or folding embodiment having a rearward tilted front panel and a forward tilted rear panel. The framework can sit upon a horizontal playing field. The front panel has a striking face divided into a flat slopped upper surface, a horizontal edge and a curved lower surface. A person can throw a ball against the striking face to rebound the ball at different angles and speeds into the playing field, depending on the skill and strength of the person throwing the ball.

Abstract: A system of four cryogenic fractional distillation columns interlinked with two equilibrators for separating a DT and hydrogen feed stream into four product streams, consisting of a stream of high purity D.sub.2, DT, T.sub.2, and a tritium-free stream of HD for waste disposal.