exempted from measurement. All other spaces shall be considered as closed in and shall be included in gross tonnage. SPACES CONSIDERED PERMANENTLY COVERED AND CLOSED IN

§ 135.61 Spaces considered permanently covered and closed in, in general. By permanently covered and closed-in spaces on or above the upper deck are to be understood all those which are separated off by decks or coverings, or fixed partitions, and which, therefore, represent an increase of capacity that is or may be used for the stowage of cargo, or for the berthing and accommodation of the passengers, the officers, or the crew. No break in a deck, nor any opening or openings in a deck or the covering of a space or in the partitions or walls of a space, nor the absence of a partition shall prevent a space from being measured and comprised in gross tonnage if means are provided for closing such a break, opening or openings, so that the spaces thus closed in be thereby better fitted for the transport of goods or passengers. The upper deck is the uppermost full length deck extending from stem to stern.

§ 135.62 Vessels having a "trunk" or "turret".

In the case of a vessel having a "trunk" or "turret", the deck forming the covering of the trunk or turret shall be considered the upper deck, and all spaces below that deck within the trunk or turret shall be considered as covered and closed in. The space within the turret or trunk shall be measured as are other between-deck spaces.

§ 135.63 Determination solely by this part.

Spaces considered as "permanently closed in" and spaces permitted to be exempted from measurement shall be determined solely by the provisions contained in this part, and not by any definitions or provisions contained in the measurement rules or regulations of any country.

SPACES EXEMPTED FROM MEASUREMENT AND GROSS TONNAGE

§ 135.81 Following spaces, only, exempted.

The following spaces shall be exempted from measurement and shall not be included in the gross tonnage, and no other space shall be exempted.

§ 135.82 Spaces on or above upper deck

not permanently covered or closed in. Spaces on or above the upper deck not permanently covered or closed in, or which may not be readily covered or closed in. In the application of this rule it will be understood that:

(a) Certain spaces under decks or coverings but permanently exposed. Spaces under decks or coverings having no other connection with the body of the ship than the stanchions necessary for their support are not spaces separated off, but are spaces permanently exposed to the weather and the sea and are not to be included in the gross tonnage.

(b) Certain spaces within a poop, forecastle, bridge house or other "permanently covered and closed in" superstructure or erection. A space within a poop, forecastle, bridge house, or other "permanently covered and closed-in" superstructure or erection may be considered as not permanently covered or closed in, and may consequently be excluded from tonnage, if the space is opposite an end opening which is not provided with means of closing, and which opening has a breadth equal to or greater than half the breadth of the deck at the line of the opening, and if the space opposite the opening cannot be used to shelter other merchandise than cargo or stores that do not require protection from the sea. If the opening is fitted with a coaming, the space within it is to be included in the gross tonnage if the coaming is more than 2 feet in height. This provision shall be so applied as to exempt from measurement only the space between the actual end opening and a line drawn parallel to the line or face of the opening at a distance from the opening equal to one-half the width of the deck at the line of the opening, provided that any closed-in space between the open face and the line drawn parallel to it shall be measured. The remainder of the space within a poop, forecastle, bridge house, or other superstructure or erection shall be considered as available for the accommodation of cargo or stores, of passengers or of the ship's personnel, and shall be measured and included in the gross tonnage. (See figs. 1, 2, and 3, following § 135.86.)

(1) Should the open space within a poop, forecastle, bridge house, superstructure, or erection between the end opening and a parallel line distant from the opening by half the breadth of the deck become, because of any arrange

ment, except by convergence of fore and aft bulkheads, of less width than half the breadth of the deck, then only the space between the line of the end opening and a parallel line drawn through the point where the athwartship width of the open space within the poop, forecastle, bridge house, superstructure, or erection becomes equal to, or less than, half the breadth of the deck chall be exempted from measurement.

(See figs. 4, 5, 6, and 7 following § 135.86.) The remainder of the space within the poop, forecastle, bridge house, superstructure, or erection is to be included in the gross tonnage.

extending

(2) When two erections from side to side of the ship are separated by an interval the fore-and-aft length of which is less than the least half breadth of the deck in way of such interval, then whatever be the breadth of the permanent end openings of the erections the entire erections, less the interval separating them, shall be measured and included in the gross tonnage. (See fig. 8 following § 135.86.)

(c) Certain spaces within a poop, forecastle, bridge house or other "permanently covered and closed in" superstructure or erection. In a poop, forecastle, side-to-side bridge house, or other "permanently covered and closed-in" superstructure or side-to-side erection the space directly in way of opposite openings, the height of which is at least 3 feet, in the side wall of the ship not provided with means of closing and corresponding to each other in the opposite walls of the ship shall be exempted. (See figs. 9 and 10 following § 135.86.) Passages running fore-and-aft abreast the engine-room casing and open at both ends shall not be exempted. The deck erection including same shall be considered a side-to-side erection provided its outboard sides are flush with the hull of the vessel.

actly in way of opposite openings at least 3 feet in height in the side walls of the ship not provided with means of closing and corresponding to each other in the opposite walls of the ship shall be exempted; and the remaining spaces under such a deck shall be measured and included in gross tonnage. In case the openings in the side walls of the ship are provided with means of closing no portion of the space under such a deck shall be exempted. (See fig. 11 following § 135.86.)

§ 135.84 Certain spaces framed in around funnels and spaces required for admission of light and air into engine rooms.

The spaces framed in around the funnels and the spaces required for the admission of light and air into the engine rooms shall be exempted from measurement to the extent that such spaces are above the deck or covering of the first or lowest tier of side-to-side erections, if any, on the upper deck as defined in §§ 135.61-135.63. A deck with one or more deck openings (usually designated as tonnage openings) that may be so closed as to permit cargo or stores to be carried in the space under the deck or portions thereof would be considered as the upper deck. There shall, however, be measured and included within gross tonnage the spaces situated within closed-in side-to-side erections on the upper deck, spaces framed in around the funnels and those required for the admission of light and air to the extent that such light and air and funnel spaces are below the deck or covering of the first or lowest tier of such side-to-side erections on the upper deck. There shall be exempted from the measurement of any superstructure or erection situated above the first or lowest tier of side-to-side erections on the upper deck such portion or portions thereof as are occupied by the spaces framed in around the funnels or by the spaces required for the admission of light and air into the engine rooms. Such exempted spaces must not be used for any other than their designated purpose and must be reasonable in extent. § 135.85 Certain spaces between inner and outer plating of double bottom. Space or spaces between the inner and outer plating of the double bottom of a vessel shall be exempted from measurement, except when used, designated or intended for carrying cargo; but the tonnage of such spaces within the double

bottom as are or may be used for carrying cargo, shall be determined and inIcluded in the gross tonnage. The tonnage of double bottom tanks available for cargo may be obtained by multiplying the liquid-capacity weight by the proper conversion factor to get tons of 100 cubic feet.

§ 135.86 Portion of aggregate tonnage of hatchways.

The cubical contents of hatchways shall be obtained by multiplying the length and breadth together and the product by the mean depth taken from the top of beam to the underside of the hatch cover. From the aggregate tonnage of the hatchways there shall be deducted one-half of 1 percent of the vessel's gross tonnage, exclusive of hatchways, and only the remainder shall be added to the gross tonnage of the ship, exclusive of the tonnage of the hatchways.

FIGURE 1.-Poop.

1⁄2a a

bb'>1⁄2 aa'. cc'<1⁄2 aa'.

E=space exempted. M-space measured.

Domes, skylights, and airshafts shall be exempt from measurement. When there is an opening in the floor of a superstructure immediately below a skylight, the exemption shall include the space between the skylight and the opening in the floor of the superstructure immediately under the skylight. The remainder of the superstructure shall be included in the measurement. The space, in addition to the skylight, that may be exempted by this section is that indicated by A, B, C, D in Figure 12, which follows.

FIGURE 12.-Open spaces between skylight and opening. Skylights

Rooms receiving light from Skylights

SPACES AVAILABLE FOR PASSENGERS NOT TO BE EXEMPTED

§ 135.111 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 § 135.82

(a).

§ 135.112 “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 §§ 135.1-135.3, 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

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

The cubical contents of the spaces included, by this part, 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 88 135.142-135.241.

in

forth in this part.

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: §§ 135.171-135.182 for the measurement of empty vessels; §§ 135.211-135.213 for laden vessels; § 135.241 for open vessels.

RULES FOR MEASUREMENT OF GROSS TONNAGE OF EMPTY VESSELS § 135.171 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. § 135.172 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 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