Abstract: An interconnected double hull construction for the basement of a building. The double hull construction includes a plurality of interior wall boards attached to the interior face of the foundation walls in a manner adapted to provide communication between air passageways located behind the wall boards and the ambient air within the basement. A plurality of secondary floor slabs are placed over the primary floor slab. A plurality of spacer members located between the primary floor slab and the secondary floor slabs are adapted to provide a plurality of interconnecting passageways. An air exhaust system is adapted to draw ambient air from within the basement through the air passageways and/or through the plurality of interconnecting passageways and exhaust the air from the structure. Sump pump means are provided for gathering water from within the basement and exhausting the water from the building.

Abstract: An improved process for forming high quality ferrite magnets utilizes relatively coarsely ground magnetic materials. The process includes pre-milling a blended and calcined magnetic material to about 0.7-1.2 microns, pressing the blend into a preform shape in the presence of an orienting magnetic field, granulating the preformed material, pre-sintering the granules short of complete sintering, milling the granules to a coarse size of about 1-2 microns, forming the milled blend into desired forms in the presence of an orienting magnetic field, sintering the pressed material, and optionally machining the sintered material.