WELCOME TO OUR Building dictionary : Ogee to open circuit PROJECT
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Summary: Building dictionary to explain building jargon and terminology from A - Z.
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Building dictionary for the letter O - Page 2
Ogee
(1) A double curve much like the letter "S." (2) The union of concave and convex lines.
Ogee moulding
Cornice moulding (may be multiple mouldings) utilizing ogee and/or reverse ogee curves to provide definition.
Ohm
A unit of electrical resistance in a conductor that produces a decrease in voltage of 1 volt with a constant current of 1 ampere.
Ohm's law
Defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere
Ohmmeter
An instrument for measuring the electrical resistance in a conductor or appliance in ohms.
Oil burner
A fuel-oil burning unit installed in a furnace or boiler.
Oil paint
A paint with drying oil as a base, as opposed to a water base or other base.
Oil preservative
See oilborne preservative
Oil separator
In a refrigeration system, a device for purging the refrigerant of oil and oil vapor.
Oil stain
A stain, with an oil base containing dye or pigment, used to penetrate and permanently color wood or other porous materials.
Oilstone
A stone with a fine-grained, oil-lubricated surface used to sharpen the cutting edge of tools.
One-hour rating
A measure of fire resistance, indicating that an object can be exposed to flame for an hour without losing structural integrity or transmitting excessive heat.
One-pipe system
(1) In drainage systems, two vertical pipes, with waste and soil water flowing down the same pipe, and all the branches connected to the same anti-siphon pipe. (2) A heating circuit in which all the flow and return connections to the radiators come from the same pipe. The radiator at the far end is therefore much cooler than the radiator which is nearest the heat source.
One-way joist construction
A concrete floor or a roof framing system with monolithic parallel joists cast with the slab. The joists are supported on girders, which in turn are supported by columns.
One-way slab
A slab panel, bound on its two long sides by beams and on its two short sides by girders. The dead and live loads acting on the slab area may be considered to be entirely supported in the short or transverse direction by the beams; hence, the term one-way.
One-way system
The arrangement of steel reinforcement within a slab that is designed to bend in only one direction.
Opacity
In painting, the ability of a paint to cover or hide the original background.
Open system
A piping system for water or fuels in which the conduits that circulate the liquid are attached to an elevated tank or tower, with open vents to facilitate storage, access, and inspection.
Open cell
A cell that interconnects with other cells in foam rubber, cellular plastics, and similar materials.
Open circuit
The absence of a direct connection between two points in an electrical network.
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