SPACES AVAILABLE FOR PASSENGERS NOT TO BE EXEMPTED

§ 27.33 Spaces for use of passengers not exempted.

Spaces for the use or possible use of passengers shall not be exempted from measurement except as stated in § 27.26(a).

§ 27.34 "Passengers" defined in case of army and navy auxiliary ships.

In case of army and navy transports, colliers, supply ships, and hospital ships, as defined in §§ 27.17-27.19, the term "passengers" shall include all officers, enlisted men, and other persons who are not assigned to duty and who are not duly inscribed on the ship's rolls.

SYSTEM FOR MEASUREMENT OF CUBICAL CONTENTS OF SPACES INCLUDED IN GROSS TONNAGE

§ 27.35 Use of Moorsom system as applied in any country in measuring vessels for national registry.

The cubical contents of the spaces included, by § 27.17-27.95, in gross tonnage may, in any country where the Moorsom system of measurement has been adopted, be ascertained under that system as applied in measuring vessels for national registry, provided that system is substantially similar to Moorsom system of measurement as set forth in S$ 27.36-27.52.

§ 27.36 Use of Moorsom system as set forth in §§ 27.17-27.95.

In countries that have not adopted the Moorsom system of measuring spaces within vessels, the cubical contents of any of the spaces included in gross tonnage shall be ascertained according to the Moorsom system as set forth in the following sections: §§ 27.37-27.48 for the measurement of empty vessels; §§ 27.4927.51 for laden vessels; § 27.52 for open vessels.

RULES FOR MEASUREMENT OF GROSS TONNAGE OF EMPTY VESSELS

§ 27.37 Length taken on tonnage deck. The length for the admeasurement 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. § 27.38 Measurement of length, in general.

Measure the length of 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 midship 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 the deck and what is due to the rake of the stern timber in the thickness of the

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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 following table, according to the class in such table to which the ship belongs:

(a) Class 1. Ships of which the tonnage deck is, according to the above measurement, 50 feet long or under, into four equal parts.

(b) 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.

(c) 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.

(d) Class 4. Ships of which the tonnage deck is, according to the above measurement, above 180 feet long and not exceeding 225 feet, into 10 equal parts.

(e) Class 5. Ships of which the tonnage deck is, according to the above measurement, above 225 feet long, into 12 equal parts.

NOTE: A greater number of divisions is permissible provided there be an even number of divisions.

§ 27.39

Measurement of length in case

of break in double bottom.

In the case of a break or breaks in a double bottom, the length of the vessel is to be taken in parts according to the number of breaks, and each part divided into a number of equal parts according to the class in the above table to which such length belongs.

§ 27.40 Finding of transverse area of ship at each point of division of length.

Then the hold being first sufficiently cleared to admit of the required depths and breadths being properly taken, find the transverse area of the ship at each point of division of the length or each point of division of the parts of the length, as the case may require 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 the tonnage deck, or, in the case of a break, below a line stretched in continuation thereof, to the upper side of the floor timber (upper side of the inner plating of the double bottom) at the

inside of the limber strake, after deducting the average thickness of the ceiling which is between the bilge planks and the limber strake.

§ 27.41 Finding of transverse area of ship at each point of division of length; manner of taking depths in certain cases.

In the case of a vessel contructed with longitudinal framing, the depths are to be taken to the upper edge or inner surface of the longitudinal frames, where no double bottoms exist. In the case of a ship constructed with a double bottom, the depth shall be taken to the upper side of the inner plating of the double bottom, and that upper side shall, for the purposes of measurement, be deemed to represent the floor timber of the vessel. This rule for measuring the depth of the hold applies to double-bottom ships having top of double bottom not horizontal. Subject to the provisions of § 27.29 regarding the exemption of double-bottom spaces, if any tank or compartment between the inner and outer plating of the double bottom is used or fitted for the carrying of cargo, the tonnage of the whole of such tank or compartment shall be determined and included in the gross tonnage of the vessel.

§ 27.42 Finding of transverse area of ship at each point of division of length.

If the depth at the midship division of the length does not exceed 16 feet, divide each depth into five equal parts; then measure the inside horizontal breadth at each of the four points of division, and also at the upper point of the depth, extending each measurement to the average thickness in that part of the ceiling which is between the points of measurement. Number these breadths from above (i. e., numbering the upper breadth 1, and so on down to the fifth breadth); mutiply the second and fourth by 4, and the third by 2; add these products together, and to the sum add the first breadth and the fifth. Multiply the quantity thus obtained by one-third of the common interval between the breadths, and the product shall be deemed the transverse area of the upper part of the section; then find the area between the fifth and lower point of the depth by dividing the depth between such points into four equal parts, and measure the horizontal breadths at the three points of division and also at the upper and lower points, and proceed as before,