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Term Definition
Butlers Pantry. A service room between kitchen and dining room  
Butt Hinge. A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame, consisting of two plates with a removable connecting pin; also called a Butt.  
Butt Joint. 1. A plain square joint between two members. 2. In wallpaper, a joint made by trimming both selvedges and butting the edges together; this is used in highest type of work. 3. The cut ends of gypsum board placed adjacent to one another. 4. The joint between two bricks placed end to end in the same course; also called Cross Joint, Head Joint, or Vertical Joint.  
Butt Weld. A weld in a butt joint between two members lying approximately in the same plane.  
Butt Welded Pipe. Pipe that is joined by welding.  
Butt, Pile. See Pile Butt.  
Butt. 1. The larger of the two ends of a log. 2. See Butt Hinge. 3. Pile Butt.  
Butterflies. Color imperfections on a lime putty finish wall which smear out under pressure of the trowel; caused by lime lumps not put through a screen and insufficient mixing of the gauging.  
Butterfly Reinforcement. Strips of metal reinforcement placed diagonally over the plaster base at the corners of openings before plastering.  
Butterfly Roof. A roof shape that is like an inverted gable, the rain gutter being in the middle instead of the ridge.  
Butterfly Tie. See TIES.  
Butterfly Valve. A valve constructed with a disc that rotates 90 degrees within the valve body.  
Buttering Trowel. The blade of the buttering trowel is approximately 4-1/2" wide and 7" long; used in buttering rich mortar to masonry, a method commonly used in the eastern states.  
Buttering. 1. Spreading mortar on a masonry unit before it is laid. 2. The spreading of a bond coat to the backs of ceramic tile just before the tile is placed. 3. See Surfacing.  
Buttonback Tile. Tile that have round or square projections on the bondable side.  
Buttress. 1. A projecting structure of masonry or wood for supporting or giving stability to a wall or building wall and to react against horizontal outward forces. 2. The broadened base of a tree trunk or a thickened vertical part of it.  
Butt-Welded Space. A reinforcing bar splice made by welding the butted ends.  
Butyl Acetate. A lacquer solvent made from butyl alcohol by reaction with acetic acid.  
Butyl Alcohol. An alcohol of higher boiling range than wood alcohol or grain alcohol; obtained from corn by fermentation.  
Butyl Caulk. Caulking that is made from various synthetic rubbers derived from butanes.  
Butyl Membrane. Pliable thin sheets or layers made from synthetic rubber.  
Butylene Plastics. Plastics based on resins made by the polymerization of butene or copolymerization of butene with one or more unsaturated compounds, the butene being in greatest amount by weight.  
Buzzer. An electric signaling device that produces a buzzing sound.  
BX Cable. A type of indoor wiring consisting of two or more insulated wires protected by a wound, galvanized steel strip cover, the metal winding forming a flexible tube offering protection similar to rigid conduit.  
BX Clamp. A clamping device to hold BX cable firmly in place against a wooden or metal member.  
Bypass. 1. Passage at one side of, or around, a regular passage. 2. A secondary pipe or bridging of any plumbing fixture allowing this fixture to be disconnected and circulation maintained.  
By-Product. A substance obtained during the manufacture of another substance; a secondary result, sometimes unexpected or unintended, of some process.  
Byte. In computing, a group of eight binary digits.  

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