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Twelve o’clock zone time, or the instant the mean sun is over the upper branch of the zone meridian. Standard noon is 12 o’clock standard time.
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Related Terms |
PLUG CUTTER
A device for boring out short dowels or plugs from wood that exactly match standard drill sizes.
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PIPE BIT
A bit designed for attachment to standard coupled pipe for use in socketing the pipe in bedrock.
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PERFORMANCE INDEX
The ratio of standard hours to the hours of work actually used; a ratio exceeding 1.00 (or 100) indicates subsoil and rocks in which the contained water is permanently frozen.
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PENTANE LAMP
A pentane-burning lamp formerly used as a standard for photometry.
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PENETROMETER
1. An instrument that measures the penetrating power of a beam of xrays or other penetrating radiation. 2. An instrument used to determine the consistency of a material by measurement of the depth to which a standard needle penetrates into it under standard conditions.
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PENETRATION NUMBER
The consistency of greases, waxes, petrolatum, and asphalt or other bituminous materials expressed as the distance that a standard needle penetrates the sample under specified American Society for Testing and Materials test.
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OPERATOR PRODUCTIVITY
The ratio of standard hours to actual hours for a given task.
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OCTANE NUMBER
A rating that indicates the tendency to knock when a fuel is used in a standard internal combustion engine under standard conditions; n-heptane is 0, isooctane is 100; different test methods yield other values variously known as research octane, motor octane, and road octane.
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N ROD BIT
A Canadian standard noncoring bit having a set diameter of 2.940 inches (74.676 millimeters).
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NARROW GAGE
A railway gage narrower than the standard gage of 4 feet 81/2 inches (143.51 centimeters).
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