On gaff-rigged sailing vessels the luff of the mainsail is secured to the mast by wooden hoops, which slide up or down the mast as the sail is raised or lowered.

A heavy longitudinal timber that angles upward from the stern to support the underside of the fantail.

A sail attached to the boom at the tack and clew, but not along the foot, or a fore-and-aft sail which is set without a boom.

When rope comes aboard a vessel and is put to use, it is called line, although some still call it rope if it is over one inch in diameter.

The bottom of a wave, the valley between the crests.

A stationary element that may be adjustable and which directs the flow medium to the inlet of an impeller.

The actual work required to compress and deliver a given gas quantity, including all thermodynamic, leakage and fluid friction losses. It does not include mechanical losses.

Costs that do not vary with the level of activity. Some fixed costs continue even if no cargo is carried. Terminal leases, rent and property taxes are fixed costs.

A valve which connects the high pressure side of a compressed air system to the suction side and is adjusted so as to maintain a specific pressure on the suction side by controlled bleeding of hot gas to the suction side.

Pre-Cooling of intake air for compressors and Blowers.

Polytetrafluorethylene.

The act of the U.S. Congress (1916) that created the U.S. Shipping Board to develop water transportation, operate the merchant ships owned by the government, and regulate the water carriers engaged in commerce under the flag of the United States. As of Ju ...

Wind-bound. When a vessel is kept in port by a head wind.

To subject petroleum oil to heat for breaking down into lighter products.

An indication on a draft that the documents attached are to be released to the drawee only on payment.

Location where cargo enters the care and custody of carrier.

Running ashore (hitting the bot-tom).

When an anchored vessel is forced, by wind or current, to swing across her anchor so as to risk fouling it with her own cable, she is said to break sheer.

Back pressure.

The rules concerning which vessel has the right of way if there is a possibility of collision between two or more boats; written to prevent accidents and collisions; includes right of way, lights, pennants, and whistle signals