Designed as a backing for plaster, this gypsum wallboard usually has holes or perforations through which plaster can seep to form keys but can have either a solid or perforated face.
Gypsum partition blocks
Two to six inch thick blocks used as the core for solid gypsum partitions.
Gypsum planks
Roofing members of two-inch thick, tongue and groove edged, steel reinforced gypsum, with galvanized wire matting in the planks.
Gypsum plaster
Normally known as plaster of paris, this gypsum powder is used as a base coat plaster.
Gypsum sheathing
Water repellent gypsum wallboard used as a base for finish exterior siding.
Gypsum wallboard
A wall finish consisting of a manufactured panel made out of gypsum plaster and encased in a thin cardboard. Usually 1/2" thick and 4' x 8' or 4' x 12' in size. The panels are nailed or screwed onto the framing and the joints are taped and covered with a 'joint compound'. 'Green board' type drywall has a greater resistance to moisture than regular (white) plasterboard.
Gyroscope
A wheel mounted in a ring so that its axis is free to turn in any direction; when spun rapidly, it will keep its original plane of rotation no matter which way the ring is turned, maintaining equilibrium.
