Constructaquote Glossary of Terms - O
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obscure glass
mainly used for decoration, diffusion, or privacy - the design is pressed into the glass during the rolling process.
ohmmeter
an instrument for measuring electrical resistance.
open cut
excavation in the open, not in tunnel.
open plan
a floor plan without subdivisions and interior walls.
outrigger
an extension of a rafter beyond a wall line, usually by means of a short piece, which laps the rafter and extends outward from the wall line.
overbreak
excavation beyond an intended limit line or surface.
overload
in structures, a weight greater than the structure is designed to carry - in electrical or mechanical terms, a load greater than the plant is designed for carrying.
overturning
tipping over - every structure, in its stability calculations, must be checked that it cannot turn over.
oxidation
the chemical combining of an element with oxygen.
oxy-acetylene flame
a flame obtained from compressed oxygen and acetylene in separate steel cylinders, used for cutting materials. Most often used by welders.