F, Iron keel ballast, important in general stability and self-righting.
Chief among these are the self-righting and self-emptying principles.
What more need be said in favour of the self-righting boats?
The whole operation of self-righting and self-emptying, from first to last, occupied only seventeen seconds!
D, End air compartments, usually called “end-boxes,” an important factor in self-righting.
The self-righting and self-emptying principles he seems not to have thought of; at all events he did not compass them.
The self-righting life-boat of 1901 was a very different boat from that of 1881.
The first life-boat which had turned end-over-end was washed ashore bottom up; her great want was the self-righting principle.
She belonged to the National Lifeboat Institution—all the boats of which are now built on the self-righting principle.
The self-emptying principle is quite equal to the self-righting in importance.