A metal air-tight tank built into a boat to insure flotation even when the boat is swamped.

The principal sail that is set on the main mast.

A track or groove in the back of the mast to which the sail is attached by means of lugs or the bolt rope.

Is a technique for predicting whether water will tend to dissolve or precipitate calcium carbonate. If the water precipitates calcium carbonate, scale forming may result. If the water dissolves calcium carbonate, it has a corrosive tendency.

A sprocket wheel on the windlass for taking links of the chain cable.

A condition where the particles (dust) becomes embedded in the fabric filter over time and are not removed by the bag cleaning process.

In the days of tall ships the barometer was a glass vessel with a thin stem. The fluid in the glass (in most cases water) would move up and down the stem as the pressure of the surrounding atmosphere changed. These movements were used to predict changes i ...

A small rail on tables and counters used to keep objects from sliding off when the vessel rolls and pitches.

An offer to sell goods at a stated price and under stated terms.

After mast on a schooner or sailing ship carrying a spanker; usually the fourth mast of a five or six masted schooner.

(Delivered Ex Quay, [Duty Paid]) (...Named Port of Destination):A Term of Sale which means the DDU term has been fulfilled when the goods have been available to the buyer on the quay (wharf) at the named port of destination, cleared for importation. The s ...

A day for general ship cleaning.

Annual publication of astronomical data for the use of navigators.

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

A suitable beach, being steep and sandy, where ships could be careened for cleaning or repair.

An electrical depth sounder or fish finder that uses sound echoes to locate the depth of objects in water. It does so by timing the sound pulses.

Indirect heat exchanger designed to transfer heat from combustion gas to the air stream added to the combustion zone.

A compartment having a watertight bulkhead at each end.

The behavior of perfect gases, or mixtures thereof, follows a set of laws. Boyle' law, Charle's law, Amonton's law, Dalton's law, Amagat's law, Avogadro's law, Poisson's law.

An order meaning sufficient (enough).