[meaning]

J2B Radio transmission designator>br>Telegraphy (automatic reception of), single-sideband (suppressed carrier) with a single channel containing quantized or digital information with the use of a modulating sub-carrier. (ALRS)

J2DEN Radio transmission designatorSingle-sideband suppressed carrier with a single channel containing quantized or digital information with the use of a modulating sub-carrier. Data transmission with a multi-condition code in which each condition repre ...

J3E Radio transmission designatorTelephony using amplitude modualtion; single-sideband, suppressed carrier. (ALRS)

The national flag flown on a jackstaff on the bow of naval ships while anchored.

The flag similar to the union of the national flag.

A hand held rock drill worked by compressed air.

Safety lines, usually of flat webbing, that run along the deck between bow and stern used to attach a tether from a safety harness.

Nickname for an unpopular seaman.

Nickname for a British naval seaman.

Sailors were once called by their first names only, and Jack was their generic name. Tar came from seamen's custom of waterproofing clothing using tar.

Used by some seamen to describe St. Elmo's Fire.

see Monkey Jacket.

Four-masted sailing ship square-rigged on the two foremost masts and fore-and-aft rigged on the two after masts.

A wood or fiber cover placed around such containers as cans and bottles.

The enclosure on a water heater, furnace, or boiler.

A pneumatic hand held percussive drill designed as a boring tool.

A short vertically erected pole at the bow on which the national flag is hoisted on naval ships while at anchor.

A line or cable secured between two points and used as a support for various purposes.

A deck with legs that can be jacked up or down. During operations, the legs rest on the sea-bed. When the rig is moved, the legs are retracted, leaving the rig floating. A jackup has normally no propulsion machinery of its own.