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.


Related Terms

PLUG CUTTER

A device for boring out short dowels or plugs from wood that exactly match standard drill sizes.

PIPE BIT

A bit designed for attachment to standard coupled pipe for use in socketing the pipe in bedrock.

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.

PENTANE LAMP

A pentane-burning lamp formerly used as a standard for photometry.

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.

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.

OPERATOR PRODUCTIVITY

The ratio of standard hours to actual hours for a given task.

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.

N ROD BIT

A Canadian standard noncoring bit having a set diameter of 2.940 inches (74.676 millimeters).

NARROW GAGE

A railway gage narrower than the standard gage of 4 feet 81/2 inches (143.51 centimeters).

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