Abstract: A method of preparation and use of lightweight, high-strength gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, acid-modified starch, and a starch cross-linking agent, having a pH of about 9 to about 11. The composition and method provide a wallboard having a lower density than conventional wallboard, and with equivalent or better strength characteristics than conventional wallboard.

Abstract: A radiographic/fluoroscopic X-ray system is disclosed employing a new and improved method and apparatus for viewing an image of a subject under examination. The system includes a flat panel display screen integrally mounted to the spotfilmer/imaging system housing. The display screen is mounted to the spotfilmer/imaging system housing to provide pivotal movement in at least one direction. Where a tiltable X-ray table is used, apparatus and circuitry is provided to maintain correct viewing orientation of the image with respect to the operator while the table is tilted throughout its range.