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bb'> aa'. od < 1 aa'. c'd' < 1 aa'. if< ee'. E = space exempted. E' - light and air and funnel space in lowest tier of

erections, measured under Art. IV, Sec. 3. M = space measured. M' – closed house, measured.

Fig. 8.—Poop and Bridge with interval less than ; the least half breadth of the Deck in way of interval.

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b

ME

M b

f (aa') (bb') (cc') (dd') (ee') (ff') = side openings. E = spaces exempted opposite side openings below continuous deck. M spaces measured. E' - light and air and funnel space, measured under Art. IV, Sec. 3.

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(c) 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 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. (See Figs. 9 and 10.)

SEC. 2. Spaces in way of opposite side openings at least 3 feet in height not provided with means of closing shall be exempted. In the case of a continuous 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 under portions thereof, only the spaces under such a deck that are exactly 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 exeñpted. (Fig. 11.)

Sec. 3. The spaces framed in round 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. 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 is to be considered as the upper deck, provided that no space beneath it abreast side openings is exempted under the provisions of section 2. 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 round 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 sideto-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 round 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.

Sec. 4. Space or spaces between the inner and outer plating of the double bottom of a vessel that are so inclosed and that have such openings as to make them usable only for water ballast shall be exempted from measurement; but such spaces

within the double bottom as are or may be used for carrying cargo, stores, feed water, coal, or other fuel shall be measured and included in the gross tonnage.

SEC. 5. 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. From the aggregate tonnage of the hatchways there shall be deducted one-half of 1 per cent 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.

Sec. 6. Companionways and companion houses shall be exempted when used solely as companionways or companion houses. When used as smoking rooms or for any other purposes than companionways or companion houses, the parts so used shall be measured and included in gross tonnage.

Sec. 7. Domes and skylights 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 rule is that indicated by A, B, C, D in the following drawing:

Skylight
A

B

D
Room receiving light

from Skylight.

Fig. 12.--Open space under skylight.

Exempted spaces, if used, must be added to gross tonnage.

Spaces available for

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Tonnage upon which charges are

Art. V. Should a vessel at any time stow cargo of any kind, bunker coal or other fuel, or stores of any description in any portion whatever of any exempted space, except spaces exempted under Art. IV, Sec. 1, Par. (b) and spaces on open decks not permanently covered, or upon decks as defined in Art. IV, Sec. 1, Par. (a), of these rules, the whole of that space shall be measured and added to the gross tonnage, and the space shall not thereafter be exempted from measurement.

Art. VI. Spaces for the use or possible use of passengers shall not be
passengers not to be
exempted.

exempted from measurement except as stated in Article IV, section 1, para-
graph (a).

In case of Army and Navy transports, colliers, supply ships, and hospital
ships as defined in Article I, 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. payable

Art. VII. If any ship carries stores, timber, cattle, or other cargo in any space occupied by cargo space upon an open deck not permanently covered or in spaces exempted carried upon deck in under Art. IV, Sec. 1, Pars. (a) and (b) of these rules, all tolls and other covered and closed in. charges payable on the vessel's net tonnage shall be payable upon the vessel's

net tonnage (as defined below in Articles X and XII) increased by the tonnage
of the space occupied (at the time at which the tolls or other charges become
payable) by the goods carried upon deck and not permanently covered or
closed-in. The deck space occupied by the goods thus carried shall be deter-
mined at the time of the application of the vessel for passage through the
canal and shall be deemed to be the space limited by the area occupied by the
goods and by straight lines inclosing a rectangular space sufficient to include
the goods. The tonnage of the space occupied by the goods shall be ascertained
in the manner prescribed below by Article IX, Rule I, for the measurement of
poops or other closed-in spaces.

Nothing in this article shall in any manner affect the provisions of Articles
II, III, and IV.

ART. VIII. The cubical contents of the spaces included, by these rules, in spaces may be by the gross tonnage may, in any country where the Moorsom system of measurement country, or by the Moor has been adopted, be ascertained under that system as applied in measuring scribed in these rules. vessels for national registry, provided that system is substantially similar to

the Moorsom system of measurement as set forth in Article IX of these rules.

Measurement of the cubical contents of

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