Page 256 - Rules of Navigation2020

tonnage deck shall be severally ascertained in manner above described, and shall be
added to the tonnage of the ship ascertained as aforesaid.

(Art.7) If there be a break, a poop, or any other permanent closed-in space on the upper deck,

available for cargo or stores, or for the berthing or accommodation of passengers of
crew, the tonnage of such space shall be ascertained as follows :
Measure the internal mean length of such space in feet, and divide it into two equal

parts; measure at the middle of its height three inside breadths, namely, one at each
end and the other at the middle of the length; then to the sum of the end breadths add

four times the middle breadth, and multiply the whole sum by one-third of the
common interval between the breadths; the product will give the mean horizontal area

of such space; then measure the mean height, and multiply by it the mean horizontal
area; divide the product by 100, or by 2.83 if the measurements are taken in meters,

in order to obtain the tonnage of such space.

(Art.8) In measuring the length, breadth, and height of the general volume of the ship or that

of the other spaces, reduce to the mean thickness the parts of the ceiling which exceed
it.

When the ceiling is wanting, or when it is not permanently fixed, the length and
breadth are reckoned from the frame of the ship.

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