LIFE-SAVING APPLIANCES ' 109

The number of sets of davits depends upon the length of the vessel.
Subject to various modifications, a few examples are given below:—
Registered length of ship in feet. Minimum number of sets of davits.
100 and under 160 2

160 190 3

190 „ 220 4

300 „ 330 8

370 „ 410 10

460 „ 520 14

640 „ 700 20

960 „ 1030 30

Provided that no ship shall be required to have a number of sets of
davits greater than the number of boats required to accommodate the
total number of persons which is carried, or which the ship is certified to
carry, whichever number is the greater.

23. How would you find approximately the cubic capacity of an open

life-boat'

* Measure the length and breadth outside and the depth inside, in
feet. Multiply them together and by -6; the product may be
assumed to be the capacity of the boat in cubic feet.

The formula would be written down, Zx#xZ)X'6=capacity;
where £==length, B=breadth, D=depth (all in feet).

24. Find the cubic capacity of an open life-boat which has measure
ments of 24 feet by 7 feet 6 inches by 3 feet.

Length 24 feet
Breadth 7*5 feet

120
168

180-0

•3 depth

524-00 cubic feet