Page 18 - Introduction to Naval Architecture

DEFINITION AND REGULATION 7

Figure 2,2 Breadth measurements

Camber or round of beam is defined as the rise of the deck in going
from the side to the centre as shown in Figure 2.3. For ease of
construction camber may be applied only to weather decks, and
straight line camber often replaces the older parabolic curve.
The bottom of a ship, in the midships region, is usually flat but not
necessarily horizontal. If the line of bottom is extended out to intersect
the moulded breadth line (Figure 2.3) the height of this intersection
above the keel is called the rise of floor or deadrise. Many ships have a flat
keel and the extent to which this extends athwartships is termed the flat
of keel or flat of bottom.
In some ships the sides are not vertical at amidships. If the upper
deck beam is less than that at the waterline it is said to have tumble home,
the value being half the difference in beams. If the upper deck has a
greater beam the ship is said to have flare. All ships have flare at a
distance from amidships.

Figure 2.3 Section measurements