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A rafter which extends from the plate of the roof to the ridge board at right angles to both members, and to which roofing is attached.

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The plates forming the outer side and bottom skin of the hull


A single wide plate that is butt-connected to two narrow plates, usually near the ends of a ship.


A chemical compound whose molecules exhibit electrically positive characteristics at one extremity and negative characteristics at the other. Polar compounds are used as additives in many petroleum products. Polarity gives certain molecules a strong affinity for solid surfaces; as lubricant additives (oiliness agents), such molecules plate out to form a tenacious, friction- reducing film. Some polar molecules are oil-soluble at one end and water-soluble at the other end; in lubricants, they act as emulsifiers, helping to form stable oil-water emulsions. Such lubricants are said to have good metal-wetting properties. Polar compounds with a strong attraction for solid contaminants act as detergents in engine oils by keeping contaminants finely dispersed.


Plate or cap which encloses compression end of compressor cylinder or combustion chamber of engine.


A board or plate lowered through the hull of a dinghy on the centerline to resist leeway.


A vertical plate or board for steering a boat.


1. A positive electrode; the plate of a vacuum tube; the electrode of an electron tube through which a principal stream of electrons leaves the inter-electrode space. 2. The positive electrode of an electrochemical device, such as a primary or secondary cell, toward which the negative ions are drawn.


Fore-and-aft structural shape or plate members attached to the underside of decks, flats, or to the inner bottom, or on the inboard side of the shell plating.


A triangular plate bracket joining port and starboard side stringers at the stem.


A fore-and-aft reference line at the upper surface of the flat plate keel at the centerline for flush shell plated vessels. Vertical dimensions are measured from a horizontal plane through the baseline, often called the molded baseline.
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