1. An announcement made aboard a naval warship to signal the crew to prepare for battle, imminent damage, or a damage emergency (such as a fire). 2. Specific positions in a naval warship to which one or more crew are assigned when battle stations is called.

Related Terms

WATCHSTANDING

The allocation of crew or staff to a watch.

HARMONIC

1. A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related. 2. A signal having a frequency which is an integral multiple of the fundamental frequency.

BRINELLING

Permanent deformation of the bearing surfaces where the rollers (or balls) contact the races. Brinelling results from excessive load or impact on stationary bearings. It is a form of mechanical damage in which metal is displaced or upset without attrition.

HOP

Travel of a radio wave to the ionosphere and back to earth. The number of hops a radio signal has experienced is usually designated by the expression one-hop, two-hop, multihop, etc

HOMING

Navigation toward a point by following a signal from that point. Radiobeacons are commonly used for homing.

TURBINE RELIEF VALVE

The turbine casing is fitted with spring-loaded relief valves to prevent damage by excessive steam pressure at the low-pressure end if the exhaust valve is closed accidentally. Some casings on smaller turbines are fitted with a sentinel valve, which serves only to warn the operator of over-pressure of the exhaust end. A spring-loaded relic valve is needed to relieve high pressure.

INTERNATIONAL CALL SIGN

An alpha-numeric symbol assigned in accordance with the provisions of the International Telecommunications Union to identify a radio station. The nationality or the radio station is identified by the first three characters; also referred to as call letters or signal letters.

BEAT TO QUARTERS

Prepare for battle (beat = beat the drum to signal the need for battle preparation)

CHAIN-SHOT

Cannon balls linked with chain used to damage rigging and masts.

INTERROGATING SIGNAL

The signal emitted by interrogator to trigger a transponder

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