516

NICHOLAS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

loading may be computed. The procedure is to consult the cargo plan
and ascertain the height of the centre of gravity above the keel (K G)
of each superimposed block of cargo and also its weight. The position
of the centre of gravity (V.C.G.) will be approximately near the middle
line of the block of cargo when it -is of equal density throughout. A
simple example will perhaps indicate the principle.

Ft

2.4'

14-

Tons

1000

Tons

I2OO 3OOO

Fig. 34.

Example.—A vessel's light displacement is 1200 tons and initial
centre of gravity 10 feet above the keel (K G). She loads 3000 tons of
coal in her lower holds, the estimated centre of gravity being 14 feet; and
1000 tons in her 'tween decks, the centre of gravity being 24 feet. If
her metacentre at load draught is 17 feet above ke*el (KM), required
her G M when loaded.

Moment (foot-tons)
42,000
24,000
12,000

Tons
V.C.G.

Coal
3000
14ft.

»
1000
24ft.

Ship
1200
10

5200

78,000