Abstract: System and method for producing metal or alloy powder are described which comprises a housing defining a cylindrical chamber having an inlet and an outlet and a plurality of passageways in the form of fluid nozzles defined through the housing wall along axes oriented at preselected angle to the chamber wall, the passageways being operatively connected to a pressurized source of fluid so that fluid is injected into the chamber as fluid jets of preselected flow rate and is swirled in controllable helical fashion generally toward the chamber outlet, and a molten source of metal or alloy operatively connected through a molten metal nozzle and atomization die to the inlet of the chamber for directing molten particles into contact with the fluid jets for solidification and cooling along downward helical paths within the chamber. A plurality of concentric annular bins may be disposed near the outlet of the chamber for collecting powder formed within the chamber.

Abstract: A system for protecting the cockpit of an aircraft from airborne contamination is described which comprises a generally tubular curtain of size corresponding to that of the canopy and cockpit and being pleated and collapsible along its length between an extended condition and a folded condition; a tray, attachable to and co-extensive with the canopy sill of the aircraft, the tray having a floor and inner and outer walls defining a circumferential recess for receiving the curtain in the folded condition; a lid for covering the tray with the bottom surface thereof in substantial contact with the inner and outer walls of the tray; a circumferential crimpable lip on each the floor of the tray and on the bottom surface of the lid for engaging respective ends of the curtain and providing peripheral hermetic seals between curtain and tray and between curtain and lid; inflatable circumferential seals in the sill and canopy for releasably attaching the tray to the sill and the lid to the canopy for providing hermetic