The curve (sag) of a rope, cable or chain hung between two points such as the anchor rode or towing line; the deeper the curve, the more catenary.

Latitude lines.

Abbreviation for "Trailer on Flat Car." The movement of a highway trailer on a railroad flatcar. Also known as Piggyback.

Same as not under command.

To make a rope fast by turns round a pin or coil, without hitching or seizing it.

Short period oscillation in level of enclosed, or partly enclosed, area of water when not due to the action of tide-raising forces.

A movement where the load initiates at an origin rail ramp and terminates at a consignee's door.

A device designed to remove solids, such as dirt, scale, rust and other contaminants from the air system.

Reduce dew point by passing compressed air through a bundle of hollow membrane fibers; water vapor and a portion of the compressed air then permeate the membrane walls and vent to atmosphere

The strokes on the ship's bell to mark the passage of time. The passage of time in each watch is marked by the bell every half-hour.

The power which is theoretically required to compress a gas under constant temperature, in a compressor free from losses, from a given inlet pressure to a given discharge pressure.

A machine that compresses gases. Divided into two groups; process gas compressors and oil and gas field compressors.

Special vessels employed in exploration for, development of or continuous production of, subsea oil and gas.

Sailor's name for the north star, Polaris, which for all practical purposes remains fixed above the north pole, bearing north from everywhere in the northern hemisphere, making it a true aid to navigation.

For ships, a cargo handling area parallel to the shoreline where a vessel normally ties up.- For land transportation, a loading or unloading platform at an industrial location or carrier terminal.

The direction and speed of the wind as it appears to those on board, relative to the speed and direction of the boat; combination of the true wind and the wind caused by the boat's movement through the water.

The proper return port of a discharged seaman.

To retire from a life at sea and settle ashore.

(1) The mast section next above the topmast and and below the royal mast. (2) The yard supported by that mast. (3) The third lowest square sail. It is stretched between the topgallant yard and the top yard.

To make fast. To bend a sail, is to make it fast to the yard. To bend a cable, is to make it fast to the anchor. A bend, is a knot by which one rope is made fast to another.