A set of regulations set down by the U.S. Civil Aeronautics Board to govern the operational control of aircraft on instrument flight. The abbreviation of this term is seldom used to denote the rules themselves, but is in popular use to describe the weathe ...

If Used

To make secure

Special Safeguard (In Agreement on Agriculture)

Class AA Ice Stregthening.

The addition of one or more redundant bits to information to verify its accuracy.

A cylinder installed in a body of water or an evaporation pan to hold a sensor, such as a float to measure water level or a hook gage. The stillwell is constructed so that there is free movement of water in and out of it, and it therefore provides a repre ...

A term applicable to personal pensions regarding tax rules which allow an individual to make.

Rope made of the fibers of the hemp plant and used for small stuff or less than 24 thread (1.75 inch circumference). (Rope is measured by circumference, wire by diameter.)

A colorless odorless very poisonous gas formed by the incomplete burning of carbon. Found in some ambient air conditions.

The amount by which magnetic variation changes up or down each year in a particular area. The annual increase or decrease is printed in the compass roses on each chart and may make a significant difference over a number of years.

A Customs document permitting the holder to temporarily carry or send merchandise into certain foreign countries (for display, demonstration or similar purposes) without paying duties or posting bonds. Any of various Customs documents required for crossin ...

A small, moveable graduated scale adjacent and parallel to the main scale of an instrument. It provides a means for interpolating between the graduations of the main scale.

Same as humidity strip.

A carrier giving a customer illegal preference to attract cargo. This can take the form of a money refund (rebate); using lower figures than actual for the assessment of freight charges (undercubing); misdeclaration of the commodity shipped to allow the a ...

Numbers of large pieces of floating ice that have come together and lie more or less in contact.

After a seam is caulked, to lay over it a narrow piece of canvas and then pour on hot pitch and tar .

Vessel contract where charterers take over all responsibility for the operation of the vessel and expenses for a certain period of time.

The replacement of a non-functional or ineffective lamp with a new, more efficient lamp.

A device or media that absorbs heat for storage for later use.