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The arm of a crankshaft attached to a connecting rod and piston.

Related Terms

DAVIT

A crane arm for handling lifeboats, stores, etc.

INDEX MIRROR

The mirror attached to the index arm of a marine sextant

GOVERNOR SAFETY STOP

On throttling-type governors, the safety stop is a weighted arm that needs the support of a governor belt. If the belt breaks, the idler arm drops and shuts the steam supply valve to the engine. On Corliss units, the flyballs fall to the lowest position and knock off the safety cams; the cams disengage the catch blocks on the steam intake valves so that no steam is admitted to the engine.

BILL

The extremity of the arm of an anchor; the point of or beyond the fluke.

ASTROLABE

An instrument which measures altitudes of celestial bodies, used for determining an accurate astronomical position, usually while ashore in survey work. Originally, the astrolabe consisted of a disk with an arm pivoted at the center, the whole instrument being hung by a ring at the top to establish the vertical.

ARM

To place tallow or other substance in the recess at the lower end of a sounding lead for obtaining a sample of the bottom.

CENTERING ERROR

Error in an instrument due to inaccurate pivoting of a moving part, as the index arm of a marine sextant. Also called ECCENTRIC ERROR

CLINOMETER

An instrument for indicating the degree of the angle of heel, roll, or pitch of a vessel; may be of the pivot arm or bubble type, usually indicating in whole degrees.

COAST AND GEODETIC SURVEY

Mapping, charting, and surveying arm of the National Ocean Service (NOS), a component of the National Oceanic and Atmospheric Administration (NOAA). The organiza- tion was known as: The Survey of the Coast from its founding in 1807 to 1836, Coast Survey from 1836 to 1878, and Coast and Geodetic Survey from 1878 to 1970, when it became the Office of Charting and Geodetic Services under the newly formed NOAA. In 1991 the name Coast and Geodetic Survey was reinstated.

LOCH

1. A lake. 2. An arm of the sea, especially when nearly landlocked.
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