Arch bar to Area drain
structure supported at the sides or ends only, used to span openings I
or spaces. '.
Arch bar. (Arch..) A flat bar or strip of iron used as a support for a flat arch. .
Arch bricks. (Arch.) Wedge-shaped bricks made to conform to the radius of an arch.
Arch buttress. (Arch.) Same as flying butteress, an arch s`pringing from a buttress or pier.
Archimedean principle. A body wholly or partly immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced.
Architect. (Arch.) One skilled in meth-ods of construction and in designing and planning buildings. Also one skilled in the supervision of their construction.
Architecture. The art and science relating to building.
Architrave. (Arch.) The lowest member of an entablature; also a door molding.
Architrave cornice. (Arch.) An entablature of two members only, an architrave and a cornice, the frieze being omitted.
Archives. A repository for the preservation of documents or records.
Archivolt. (Arc1t An ornamented or adorned band or frame running over the face of the arch stones of an arch, and bearing upon imposts; also a collection of members forming the inner contour of an arch.
Archway. (Arch.) The space or passage under an arch.
'Argand diagram. A Cartesian coordinate system for graphing complex numbers, the real part being plotted against the horizontal axis and the imaginary part being.plotted along the vertical axis.
Arcing. (Elec.) Forming an are, as at the brushes of a dynamo or in a broken circuit.
Arc Lamp. A lamp in which a bright spark is made across a gap between two conductors" when electric current runs through them.
Arclamp carbon. (Elec.) One of the carbon rods between which the arc' occurs in an arc lamp.
Arc of contact. (Mech.) In tooth gearing, the space included between those two points where the contact of a single pair of wheel teeth begins and ends.
Arc weiding. The piece to be welded is usually. made the positive terminal. Direct current is used. The welding rod is the negative. The work is touched with the rod and withdrawn slightly causing an arc.
Area. (Arch.) An open space or court; an ~ncovered space. (Math.) The measured content of a surface.
Area drain. (Plumb.) A drain placed in the floor of a basement areaway,a depressed or basement entry way, a loading platform, or a cemented driveway which cannot otherwise be drained. Such a drain is usually made in 4-in. or larger cast-iron pipe. leading into a running trap with clean out and into the house drain.
Arena. (Arch.) The oval central space in a Roman amphitheater. The name frequently applied to any scene of athletic contest.
Argon. (Chern.) A colourless, inert gas resembling nitrogen; present in oridnary air to the extent of 0.9 per cent. Obtained by fractional distill-ation of liquid air, and used for filling electric incandescent lamps.
ARI. Automatic Road Information Traffic control system used in Europe which is multiplexed onto FM music programme. (see 'Multiplex)
Arm. Commonly, tonearm. Often applied to whole tonearm assembly though strictly excludes cartridge.
Armature. (Elec.) The revolving
member of a dynamo.
Armature coil. (ELec.) That portion of an armature winding passed over, in following the course of the winding from the commutator segment to anther. Or, a section of armature winding prepared on a form to the exact shape iequired to fit into the slots of the armature core.
Armature core. (Elec.) A core of metal surrounded by a coil of wire or the like, rotating near the poles of a magnet.
Armature current. (Elec.) See Cur
rent.
Armature of a magnet. (Elec.) or
"keeper." A bar of iron or steel placed across the poles of a horseshoe magnet for the preservation of magnetization, or the movable iron or steel piece controlled by an electromagnet, as the armature of
a bell. .
Armature reaction. (Elec.) Certain reactions against the magnetie circuit of a dynamo which are established by the rotation of the armature.
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