A tall buoy used as a navigational aid.

The radio operator.

Specific Power Consumption.

To communicate with a vessel in sight.

The shaft input per unit of compressor capacity.

The ratio of fuel consumption to compressor capacity.

This property is the ratio of the specific weight of air or gas to that of dry air at the same pressure and temperature.

The quantity of heat required to raise the temperature of a unit weight of a substance by one degree.

A measure of air compressor efficiency, usually in the form of bhp/100 acfm or acfm/bhp

Is the volume of a given weight of gas, usually expressed as cu ft/lb as SPT conditions.

This property of a gas is the weight of air or gas per unit volume. Unless specified, it refers in compressor practice to the weight per unit volume at conditions of total temperature, total pressure and composition which prevail at the compressor intake.

The number of revolutions per minute of the compressor shaft.

A ball shaped buoy marking a navigational hazard.

An outrigger used to hold a block clear of a mast or of the ship's side.

Small hole bored in cask or barrel to allow air to enter when emptying.

To spill the sails is to take the wind out of the sails, either by heading up into the wind, or by easing the sheets to the point where the sails can hold no wind.

To empty the wind out of a sail.

The rod connecting the disc to the lever on a valve.

A tall cone shaped navigational buoy.

Finely-divided water swept from crest of waves by strong winds.