I beam: A rolled iron or steel joist having an I section, with short flanges.
I-head cylinder: The internal combustion engine construction having both inlet and exhaust valves located in the cylinder head.
Imhoff cone: A graduated glass vessel for measuring settled solids in testing the composition of sewage.
Imhoff tank: A sewage treatment tank in which digestion and settlement take place in separate compartments, one below the other.
incidental element: NULL
incinerator: A furnace or other container in which materials are burned.
inclined cableway: A monocable arrangement in which the track cable has a slope sufficiently steep to allow the carrier to run down under its own weight.
inclined drilling: The drilling of blastholes at an angle with the vertical.
inclined plane: A plane surface at an angle to some force or reference line.
inclined-tube manometer: A glass-tube manometer with the leg inclined from the vertical to extend the scale for more minute readings.
incompetent rock: Soft or fragmented rock in which an opening, such as a borehole or an underground working place, cannot be maintained unless artificially supported by casing, cementing, or timbering.
incomplete lubrication: Lubrication that takes place when the load on the rubbing surfaces is carried partly by a fluid viscous film and partly by areas of boundary lubrication, friction is intermediate between that of fluid and boundary lubrication.
incompressibility: Quality of a substance which maintains its original volume under increased pressure.