Unformatted text preview: when the ships
are being docked 2/ tow barges by pulling them
with a cable in the ocean 3/
Tumble Home ----An inboard slant of a ship's
side above the bilge. The amount the top of the
side shell slopes back toward the centerline
between the point of widest breadth and the deck
at side (see Fig. 3) Tow Knees.
Tractor propulsion ----A system of vertical
blades used to propel a vessel in the water. Used
on some harbor tugs and ferries. Made by
Volith. Sometimes called a cyclonic system in E6002 – Ship Terms & Definitions p. 21 © C.G.Daley U
Ullage Hatch ---- A small hinged opening on a
tank for gauging or sampling cargo. The ullage
is the distance from the top of this hatch to the
top of the cargo. It is the 'opposite' of innage. Ullage
hatch used for gauging the ullage or innage of a
Uptake ----Connection between boilers and
Vapor Header ----A pipeline connected to the
top of a cargo tank that channels the displaced
tank vapors to a shoreside control system.
Vertical Keel ----A row of vertical plates
extending along the center of the flat plate keel.
It sometimes is called the center keelson.
Voice Tube ----A large speaking tube that goes
from one operating station to another. Very
Void Tank ----A watertight space that does not
carry ballast or cargo. For floatation. W
Water Line ----Any one of certain lines of a
ship parallel with (and at various heights above)
the base line. In half-breadth plans the
waterlines are smooth curves showing the shape of the ship; in profile plans they a re projected as
The intersection of the moulded surface with a
horizontal plane at a given height above the base
line. The six foot water line is exactly six feet
higher than the base line.
These intersections are shown in the half breadth
plan in the lines drawing. They should not be
confused with the "load line" marked on the
outside of a ship when built. Ship fitters use a
waterline merely as a height above the base line
and in this sense waterlines are marked on
bulkheads, frames, and other members, for the
purpose of properly setting and aligning the
Watertight ----So riveted, caulked, or welded as
to prevent the passage of water.
Waterway ----A narrow passage along the edge
of a deck for drainage. A gutter.
Ways ----Timbers, etc., on which a ship is built
or launched. (See Launching.)
Weather Deck ----A deck exposed to the
Web ----The vertical portion of a beam, the
athwartship portion of a frame, etc.
Web Frame ----A frame with a deep web.
Welding ----Fusing together two or more
members with electric arc or by other means.
Well ---- A cofferdam or a sump in the double
Wheel ----Nickname for propeller; steering gear
Winch ----A small hoisting device; used in
pulling lines or cables in handling cargo. Can be
hand, air motor, electric, steam, engine, etc...
Windlass ----A machine used to hoist the
anchors by winding in the anchor chain.
Wind Scoop ----A device used to divert air into
a compartment of a ship. E6002 – Ship Terms & Definitions
© C.G.Daley Z
Zee-bar ----A structural shape with a cross
section resembling the letter Z. Reference: http://www.purgit.com/shippart.html
Disclaimer on web site: “Hank Hilliard did not author
this article, nor did he draw the illustrations. He does
not know who did. There was no name on the pages
to identify the author or when it was written. The
pages were old and somewhat yellowed, indicating a
document that has been around for sometime. My
theory is that it is in the public domain. The concepts
seem to be current enough. It is presented here for the
purpose of education. I have added to the definitions
where I believe I have some authority. Please contact
me if you can add to this document.” p. 22...
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- Winter '14
- Nautical terms, Ship construction, stern, Keel, Rudder Stock