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A long, thin ice crystal whose cross-section is typically hexagonal. The expression ICE NEEDLE should not be confused with NEEDLE ICE

Related Terms

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.

NEEDLE BLOW

A blow-molding technique in which air is injected into the plastic article through a hollow needle inserted in the parison.

NEEDLE

1. A device made of steel pointed at one end with a hole at the other; used for sewing. 2. A device made of steel with a hook at one end; used for knitting. 3. A piece of copper or brass about 1/2 inch (13 millimeters) in diameter and 3 or 4 feet (90 or 120 centimeters) long, pointed at one end, thrust into a charge of blasting powder in a borehole and then withdrawn, leaving a hole for the priming, fuse, or squib. Also known as pricker. 4. A thin pointed indicator on an instrument dial.

HOTCHKISS SUPERDIP

A sensitive dip needle consisting of a freely rotating magnetic needle about a horizontal axis and a nonmagnetic bar with a counterweight at the end which is attached to the pivot point of the needle.

HUNTING

Fluctuation about a mid-point due to instability, as oscillations of the needle of an instrument about the zero point.

HEELING ADJUSTER

A dip needle with a sliding weight that can be moved along one of its arms to balance magnetic force, used to determine the correct position of a heeling magnet.

NEEDLE BEARING

A rolling type of bearing containing rolling elements that are relatively long compared to their diameter.

ADF REVERSAL

The swinging of the needle on the direction indicator of an automatic direction finder throug

MAGNETIC COMPASS

A compass depending for its directive force upon the attraction of the horizontal component of the earth’s magnetic field for a magnetized needle or sensing element free to turn in a horizon- tal direction.

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