A frame used to support the boom when the sail is down.

A pressure-volume diagram for a compressor or engine cylinder produced by direct measurement made by the use of a device called an indicator.

A device worn to reduce the level of noise heard by the wearer.

Propeller

The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different geographic locations, so the nearest compass rose to each location on a chart must be used.

The after section of the propeller shaft.

(FOK)A particular type of order which a client gives to his broker when buying shares.

A form of wear in which seizing or tearing of the gear or bearing surface occurs.

Port Liner Term Charges.

Dangle a man from one of the yard arms, sometimes by the neck, if the man was to be killed, and sometimes by the toes, if he was merely to be tortured. A severe punishment used aboard sailing ships long ago. Today, a reprimand.

A measurement of atmospheric conditions aloft, above the effective range of a surface weather observation. Elements evaluated include temperature, humidity, pressure, wind speed, and wind direction.

A device for measuring the height of tide. It may be simply a graduated staff in a sheltered location where visual observations can be made, or it may consist of an elaborate recording instrument (sometimes called a marigraph) making a continuous graphic ...

A recording magnetometer.

Areas on a steel fracture surface having a characteristic white crystalline appearance.

Fast Rescue Boat

Royal Mail Ship

The direction, with respect to true north, from which the wind is blowing. Distinguish from magnetic wind direction. In all standard upper-air and surface weather observations, it is true wind direction that is reported.

A unit of electricity consumption of one Watt over the period of one hour.

A generic term for any machine that enables a human being to communicate with a computer.

Relay to all others in order (a signal repeated from one ship to the next astern in column).