512

NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

For example, the displacement given
at 17 feet is 8320 tons

• at 18 „ 8900 „

Difference in 12 ins. 580 „ DifL for 1 in. is 48*3 T.P.I

add for

6 ins. 290 „
17 ft. 0 „ 8320 „

Displacement at 17 6 8610 „

„ 80 3600 „ From Displacement Scale.

Deadweight in S.W.

5010 tons, at a draught of 17 ft. 6 ins.

CURVE OF STABILITY

A curve of suability is one which shows graphically the relative
leverages exerted by the ship to restore herself to a position of equili-
brium when she has been forcibly inclined by the wind or sea. The
reading of this curve calls for a general understanding of the principles
of stability as^ already explained.

Fig. 32.

The figures of the inclined ship show a vessel at different angles of
heel and in each case' G represents the centre of gravity of the ship