350 tfflOHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

Example. — Required the capacity in gallons and tons of fresh
water of a tank measuring 16 ft. X 6 ft. XlO ft.

Volume=16x6xlO=960 cubic ft.
Capacity in galls =960x61=6000 galls.
Capacity in tons=960~36=26f tons

Example. — How many Ibs. of mixed black paint would be required
to give one coat to a funnel 50 ft. long and 20 ft. in diameter, if 1 Ib of
mixed paint covers 70 square ft.

Area of funnel=circumference X length

_ 2 22 10 50
~ I x 7 x i x i
„ =3143 sq. ft.
3143
Weight of paint =—— = 44 9 Ibs.
Example. — A topside trimming tank is uniformly triangular in shape
throughout its length. The end measures 12 ft. XlO ft. Xl4 ft. and
the tank is 30 ft. long; find its capacity in ton% of salt water.
Volume =area of end X length
„ =<\/s (5— ») (s—b) (s—c)Xl
„ =<v/18x6x8x4 X 30
„ = 58-8x30
„ = 1764 cub. ft.
1764
Capacity =— — =504 tons
35
Example. — Find the reserve buoyancy in salt watei of a barrel 4 ft.
1 in. long, end diameter 20 in., bilge diameter 28 in. ar»d weighing 50 Ibs.
Volume =TC r2 I
22 12 X 12 49 rt 0
„ =— X - ~ - X —=12-83 cub. ft.
An equal volume of water supports 12-83 X64- • = 821 Ibs.
Weight of barrel ..... « 50 ,,»
...— . ^
Reserve buoyancy - • - * - = 771 „