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Term Definition
Angle Blasting. Blast cleaning at angles less than 90 degrees.  
Angle Block. A square of tile specially made for changing direction of the trim.  
Angle Brick. Any brick shaped to an oblique angle to fit a salient corner.  
Angle Divider. A toolused by tilesetters to determine the degree of an angle to cut; used for fitting trim, moldings, and floors into corners; a corner angle is measured by adjusting the divider to fit the corner.  
Angle Float. A concrete or plastering finishing tool having a surface bent to form a right angle; used to finish re-entrant angles.  
Angle Iron. A rolled steel structural member with an L-shaped section; used to support brickwork over doors and windows and is sometimes used as main runners in lieu of channels to support plaster.  
Angle of Degree. On an airless spray cap, the orifice angle; controls width of spray and pattern angle.  
Angle of Incidence. The angle that a line or light ray striking a surface makes with the perpendicular at that point, the point of incidence.  
Angle of Reflection. The angle that a reflected ray makes with the perpendicular to a surface at the point of incidence.  
Angle of Repose. 1. The natural angle that a pile of a material, such as earth, sand, or gravel will assume. 2. The angle at which a body will slide down an inclined plane impelled only by gravity.  
Angle Steel. An L-shaped steel member.  
Angle Stop. A water valve that occurs where there is a 90 degree change in direction of the piping, as under a lavatory or sink.  
Angle, Shelf. A structural angle which is fastened to the structure of a building to support a wall or other component.  
Angle. 1. The difference in direction of two lines which meet or tend to meet, usually measured in degrees. 2. An inside corner. 3. A structural section of steel which resembles an L in cross section. 4. In masonry, a portion of a whole brick which is used to close the bond or brickwork at corners.  
Anhydrite. The mineral consisting primarily of anhydrous calcium sulfate, CaSO4  
Anhydrous Calcined Gypsum. Keenes Cement.  
Anhydrous Calcium Sulphate. A stable form of gypsum from which practically all of the water of crystallization has been removed; also called dead-burned gypsum; dry chemical made of calcium, sulphur and oxygen, CaSO4.  
Anhydrous. Dry; free from moisture or water in any form.  
Aniline Colors. Coal-tar derivatives precipitated on a colorless base.  
Anisotropic. Exhibiting different properties when measured along different axes; in general, fibrous materials such as wood are anisotropic; not isotropic.  
Annealed Glass. Glass whose surface has been heated to melting and then cooled to provide a toughened surface; also called heat strengthened glass.  
Annealed. Cooled under controlled conditions to minimize internal stresses.  
Annealing. Process of heat treating metal to get desired properties of softness and ductility.  
Annex. A wing or an addition to a building.  
Annual Growth Ring. The layer of wood growth put on a tree during a single growing season, comprised of springwood and summerwood.  
Annuity. An investment of money entitling the investor to receive a series of equal monthly or yearly payments.  
Annular Ring Nail. A nail that has grooves around the shank which prevent easy withdrawal; also called a ring shank nail.  
Annunciator Panel. A panel mounted on a surface which indicates by lights which circuits have been activated.  
Annunciator. A electromagnetic device used to show which of several circuits are activated.  
Anode. 1. The positive electrode in an electrolytic cell. 2. The negative terminal of a primary cell such as a battery.  

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