In bridge work it usually refers to the working chamber in a pneumatic caisson.Īir Compressor: A machine by which air is compressed into a receiver so that its expansion may be utilized as a source of power.Īir Current: The moving of air through space or through a conduit.Īir Cushion: A buffer using air to absorb impact of a moving mass and gradually to bring it to rest.Īir Cylinder: A nearly air-tight hollow cylinder having a piston moving in it.Īir Dolly: A dolly operated by compressed air. The furnace is lined with a silicious material that has no effect on the phosphorus content.Īcid Steel: Steel made without the use of lime.Īctivity of Cement: The time required for a cement to pass from its initial set to its final or hard set as determined by the Vicat Needle.Īctual Horsepower or Brake Horsepower: The actual horsepower of an engine as measured at the flywheel by a friction-brake or a dynamometer.Īdhesion: The force which holds together two bodies placed in close contact with each other.Īdiabatic Curve: A curve exhibiting the relation between the pressure and volume of a fluid upon the assumption that there is no transmission of heat during expansion or contraction.Īdjustable Eye-bar: An eye-bar that, can be lengthened or shortened after erection by means of a sleeve-nut, turn-buckle, or clevis.Īdjustable Member: A member of a bridge, the length of which can be increased or diminished at will.Īdjusting Key: A wrench in which the jaws are made adjustable.Īdministration: The direction or oversight of any office, service, or construction or the management of public affairs.Īdulterant: A substance substituted partially for another without acknowledgment.Īdulteration: The partial substitution of one substance for another without acknowledgment.Īdvancing Load Stress: A stress in a member induced by a load advancing on the structure.Īdze: A hand tool, having a curved cutting edge perpendicular to the handle, used for dressing the surfaces of timbers or stones.Īeration Jet: A jet of water through which air travels.Īggregate: The inert material such as sand, broken stone, etc., with which the cement or other adhesive material is mixed to form a concrete or mortar.Īir-blast: An air current forced upon a fire to stimulate combustion.Īir Brake: A system of braking mechanism operated by compressed air.Īir Chamber: An enclosed space containing air. The furnace is lined with a silicious material.Īcid Open-hearth Steel: A metal formed of pig iron, cast iron, and wrought iron or steel scrap, which is converted into steel by the direct action of an oxidizing flame in a regenerative gas furnace. Just before tapping, spiegeleisen or an artificial ferromanganese is added to the charge in order to destroy the oxide slag and prevent red shortness. The lining of the converter is of a silicious material that will have no effect on the phosphorus, hence that element is not eliminated.Īcid Open-hearth Furnace: A furnace used in the manufacture of Acid Open-hearth Steel.Īcid Open-hearth Process: That process of producing steel from pig and scrap iron, in which the first step is to remove most of the silicon, manganese, and carbon from the molten mass. In contra-distinction to a lap-joint where the splice is shingled.Īcceleration: The increase, in velocity which takes place in a unit of time.Īcid Bessemer Steel: A metal produced by the decarburization of crude pig iron in a converter where finely divided air currents are blown through the molten mass. A structure sustaining one end of a bridge span and at the same time supporting the embankment which carries the track or roadway.Ībutment Line: The closing line of an equilibrium polygon.Ībutment Wall: A wall in an abutment, or a wall serving the purpose of an abutment.Ībutting Joint: A square joint confined to a single plane where the parts meet.
22dd.Ībacus: The upper member of the capital of a column.Ībscissa: A term in rectangular coordinates referring to the horizontal distance of any point from the vertical axis.Ībutment: That part of a pier from which an arch springs. Glossary of bridge terminology-A University of Iowa LibrariesĪ-Truss: A four-panel truss having extended batter posts intersecting over the centre resembling somewhat the letter A.
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