572 MOLESWORTH S POCKET-BOOK
Tonnage O. M. or Builders’ Tonnage—continued.
Breadth of Beam. Length to be Multiplied by Constant, Subtract. Breadth of Beam. Length to be Multiplied by Constant, Subtract.
feet. 81 3-4’89893 1696-1 feet. 91 44-0478T 2405-1
82 35-76596 1759-7 92 45-02128 2485’2
83 36-64362 1S24-8 93 46-00532 2567-2
84 37-53191 1891-6 94 47'00000 2650’8
85 38-430S5 1960-0 95 48-00532 2736-3
86 39-34043 2030-0 96 49-02128 2823’6
87 40-2G0B4 2101-6 97 50-04787 2912-8
88 41-19149 2174-9 98 51-08511 3003-8
89 42-13298 2219-9 99 52•13298 3096-7
90 43-08511 2326'6 100 53-19149 3191-5
This Table shows, in the second column, the tonnage per
foot length of ship, according to the ordinary rule. Thus,
14 feet beam gives 1 ton per foot of length, 20 feet beam gives
2 tons per foot of length, 28 feet beam gives 4 tons, 31 feet
5 tons, 34 feet 6 tons, and so on for each foot in length; but
this number is merely approximate, and wants correction,
The third column supplies the correction, which is in tons, to
be deducted. For example: Required the tonnage of a vessel
whose length = 210 feet, breadth of beam = 39 feet
8-09043 X 210 = 1698'99
189-4
1509-59 = Tonnage.
The Table has been computed from the following formula—
Tonnage B. O. M. =
(Å - |B) X B X i B _ i AB2 — T3ff B3 _ 1 ß2 __________3_
94 94 188 9-40
A being the length between perpendiculars expressed in feet,
and B the extreme breadth in feet. The' tonnage of a vessel of
any dimensions, not given in the Table, may easily be calcu-
lated from either of the above expressions, with the help of a
table of squares and cubes.
N.B. — = 0-00531 91489 36,
188
' 3
---= 0-00319 14893 62.
040