# BODY PLAN

A drawing showing the forms of the various cross sections, the curvature of the deck lines at the side, and the projections, as straight lines of the waterlines, the buttock lines, transverse elevations and the diagonal lines

## Related Terms

### FREEBOARD DECK

Deck to which freeboard is measured

### HARMONIC MOTION

The projection of circular motion on a diameter of the circle of such motion. Simple harmonic motion is produced if the circular motion is of constant speed. The combination of two or more simple harmonic motions results in compound harmonic motion.

### TWEEN DECK

The space between any two adjacent decks

### HORIZON

The great circle of the celestial sphere midway between the zenith and nadir, or a line resembling or approximating such a circle. The line where earth and sky appear to meet, and the projection of this line upon the celestial sphere, is called the visible or apparent horizon. A line resembling the visible horizon but above or below it is called a false horizon. The circle of the celestial sphere-formed by the intersection of the celestial sphere and a plane perpendicular to the zenith-nadir line is called sensible horizon if the plane is through any point, such as the eye of an observer; geoidal horizon if through any sea-level point; and celestial or rational horizon if through the center of the earth. The geometrical horizon was originally considered identi- cal with the celestial horizon, but the expression is now more commonly used to refer to the intersection of the celestial

### FLUSH DECK

The upper deck of a vessel that extends unbroken from stem to stern.

### FUTTOCK

A piece of timber that make up a large transverse frame.

A transverse beam placed over the transom with fairleads for mooring warps.

### BEAR

Large squared off stone used with sand for scraping clean wooden decks.

### BELOW DECKS

In or into any of the spaces below the main deck of a vessel.

### FLIGHT DECK

The flat deck used for the launch and recovery of aircraft.