Abstract: A surgical structure for preventing skin irritation occasioned by confinement of a body part within a plaster cast featuring the provision intermediate the cast and body part of a loosely compacted fibrous layer communicating through a passage in the cast with a source of conditioned air controlled as to pressure, temperature and humidity and providing an air flow path adjacent the skin of the body part so that drying thereof is substantially avoided. A barrier layer is desirably located proximate the fibrous layer to prevent movement thereinto of cast material during the molding thereof. Connector means are provided from the air source through socket means embedded in the plaster cast and communicating with the loosely compacted fibrous layer.

Abstract: Apparatus for removing ionic impurities from an electro-plating bath and similar electrolyte solutions by electrodialysis of the solution comprises a special electrolytic cell having a generally tubular anode, a generally tubular cathode and a generally tubular permselective membrane that are disposed concentrically with respect to each other, the generally tubular permselective membrane being positioned between the tubular anode and the tubular cathode. Additionally, the cell is provided with longitudinally movable scraper means for removing precipitated particulate matter from the surface of one of the generally tubular electrodes (that is, from the surface of the anode or the cathode) facing the permselective membrane.