Page 253 - Rules of Navigation2020

Rule 1 - For Ballast Vessels

(Art.1) The length for the admeasurements of ships having one or more decks is taken on the
tonnage deck, which is:

a) The upper deck for vessels having one or two decks.
b) The second deck from below for vessels having more than two decks.

Measure the length of the ship in a straight line along the upper side of the tonnage
deck from the inside of the inner plank (average thickness) at the side of the stem to

the inside of the mid ship stern timber or plank there, as the case may be ( average
thickness ), deducting from this length what is due to the rake of the bow in the

thickness of deck, and what is due to the rake of the stern timber in the thickness of
the deck, and also what is due to the rake of the stern timber in one-third of the round

of the beam; divide the length so taken into the number of equal parts required by the
(1)
following Table , according to the class in such Table to which the ship belongs.
(Art.2) Class 1: Ships of which the tonnage deck is, according to the above measurement,

50 feet long or under, into four equal parts.
Class 2: Ships of which the tonnage deck is, according to the above measurement,

above 50 feet long and not exceeding 120 feet, into six equal parts.
Class 3: Ships of which the tonnage deck is, according to the above measurement,
above 120 feet long and not exceeding 180 feet, into eight equal parts.

Class 4: Ships of which the tonnage deck is, according to the above measurement,
above 180 feet long and not exceeding 225 feet, into ten equal parts.

Class 5: Ships of which the tonnage deck is, according to the above measurement,
(1)
above 225 feet long, into twelve equal parts.

(Art.3) Then, the hold being first sufficiently cleared to admit of the required depths and

breadths being properly taken, find the transverse area of such ship to each point of
division of the length as follows:
Measure the depth at each point of division, from a point at a distance of one-third of

the round of the beam below such deck, or, in case of a break, below a line stretched
in continuation thereof, to the upper side of the floor timber, at the inside of the limber

1 ) Refer the Constantinople in 1873.

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