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(naval architecture)
The outline of a ship, either as projected onto one of three perpendicular planes or as viewed visually. Also known as ship's lines.





the contours of the outer surface of a vessel’s hull. They are depicted graphically by the lines drawing plan of the vessel. The shape of the lines affects the water resistance to the vessel’s motion, the operating conditions of the engines, the vessel’s ability to mount waves, its icebreaking performance and seaworthiness, and other service characteristics. The lines of water-displacing vessels show the shape of the bow and stern frames (U-shaped and V-shaped), and the sharpness of the lines indicates the block coefficient (the ratio of the submerged volume of the vessel’s hull to the volume of a parallelepiped having the same overall dimensions). The optimum lines are determined by model tests of a vessel in an experimental pool. Slow-speed vessels and those that are not self-propelled can have bluff lines (simplified lines formed by flat surfaces).

References in classic literature ?
[Greek] which strengthened my suspicion that this was the original ending of the second of the two lines above under consideration.
I believe this to be a hit at the writer's own countrymen who were of Phocaean descent, and the next following line to be a rejoinder to complaints made against her in bk.
{81} This line is enclosed in brackets in the received text, and is omitted (with note) by Messrs.
{82} This line exists in the text here but not in the corresponding passage xii.
The famous dactylism, therefore, of the Odyssean line was probably suggested by that of the Ileadic rather than by a desire to accommodate sound to sense.
Fully a month had passed, and we were constantly up and down the river, and down and up the bay, with no spare moments to devote to the particular fisherman who ran a Chinese line in the bight of Turner's Shipyard.
The speck of a boat grew larger and larger, till we could see Big Alec and his partner, with a turn of the sturgeon line around a cleat, resting from their labor to laugh at us.
It had been torn from the line, a section of which was dragging to it.
SOCRATES: Therefore the double line, boy, has given a space, not twice, but four times as much.
SOCRATES: What line would give you a space of eight feet, as this gives one of sixteen feet;--do you see?
SOCRATES: And the space of four feet is made from this half line?
SOCRATES: Such a space, then, will be made out of a line greater than this one, and less than that one?