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follows: Measure the internal mean distance between the aft side of the length of the space in feet, and divide sternpost and the rabbet of the sternpost it into two equal parts; measure at the at the point where the counterplank middle of its height three inside crosses it. Measure also the greatest breadths, namely, one at each end and breadth of the ship to the outside of the the other at the middle of the length; outer planking or wales at the middle then to the sum of the end breadths add perpendicular. Then, having first four times the middle breadth, and mul marked on the outside of the ship on both tiply the whole sum by one-third of the sides thereof the height of the uppermost common interval between the breadths; full-length deck at the ship's sides, girt the product will give the mean horizontal the ship at the middle perpendicular in a area of the space; then measure the direction perpendicular to the keel from mean height and multiply by it the mean the height so marked on the oustide of horizontal area; divide the product by the ship, on the one side, to the height so 100 (or by 2.83 if the measurements are marked on the other side, by passing a taken in meters) and the quotient shall chain under the keel; to half the girth be deemed to be the tonnage of the thus taken add half the main breadth; space.
square the sum, multiply the result by the
length of the ship taken as aforesaid, § 135.182 Miscellaneous provisions as to measurement of length, breadth, and
then multiply this product by the factor height.
0.17 in the case of ships built of wood,
and by the factor 0.18 in the case of ships In measuring the length, breadth, and built of iron or steel. The product will height of the general volume of the ship
give approximately the cubical contents or that of the other spaces, reduce to the of the ship, and the tonnage can be asmean thickness the parts of the ceiling
certained by dividing by 100 or by 2.83, which exceed the mean thickness.
according as the measurements are taken When the ceiling is absent, or when it is
in English feet or in meters. not permanently fixed, the length and breadth shall be reckoned from the main
§ 135.213 Measurement of permanently
covered or closed-in spaces on frames of the ship, not from the web or belt frames. The same principle is to
above upper deck. hold in the case of deck erections; that is, If there is a break, a poop, or other the breadth is to be reckoned from the permanently covered and closed-in main framing or stiffeners of the same, spaces (as defined above in $$ 135.61when ceiling is not fitted. When the 135.63) on or above the uppermost fullmain framing of the ship is curved or length deck, the tonnage of such spaces carried upward and inboard so as to per
shall be ascertained by multiplying tomit the building of topside tanks or
gether the mean inside length, breadth, compartments outboard of the main
and depth of such spaces and dividing framing, the breadth of the ship shall be
the product by 100, or 2.83, according as reckoned from the outboard framing of
the measurements are taken in English
feet or meters, and the quotient so obsuch outboard tanks, thus including
tained shall be deemed to be the tonnage these tanks in the measurement.
of the spaces, and shall be added to the RULES FOR MEASUREMENT OF GROSS other tonnage, in order to determine the TONNAGE OF LADEN VESSELS
gross tonnage or total capacity of the § 135.211 Measurement of ships having
ship. cargo or when preceding rules are
RULES FOR MEASUREMENT OF GROSS Tonunworkable.
NAGE OF OPEN VESSELS When ships have cargo on board, or
§ 135.241 Boundary line of measurewhen for any other reason their tonnage
ment; depths how taken. cannot be ascertained by means of
In escertaining the tonnage of open $ $ 135.171–135.182, proceed in the man
ships, the upper edge of the upper strake ner outlined in the following section.
of the shell plating is to form the bound§ 135.212 General rules.
ary line of measurement, and the depths Measure the length on the uppermost shall be taken from an athwartship line, full-length deck from the outside of the extended from upper edge to upper edge outer plank at the stem to the aft side of of the said starke at each division of the the sternpost, deducting therefrom the length.
Subpart C-Deductions From Gross Tonnage To Ascertain Net Tonnage DEDUCTIONS ALLOWED FOR ALL VESSELS § 135.271 Deductions allowed for all
vessels. The following spaces (enumerated in $$ 135.275-135.286) shall be deducted from the gross tonnage in order to ascertain the net tonnage of vessels not propelled by engines, and no other spaces shall be deducted. These deductions will also be allowed for vessels propelled by engines, with additional deductions for vessels propelled by engines, listed in $ $ 135.321-135.327. Unless otherwise expressly stipulated, these spaces shall be deducted whether located above or below the upper deck. § 135.272 Measurement of cubical con
tent of deducted spaces. The volume or cubical contents of deducted spaces shall be ascertained in the manner specified in $$ 135.141 or 135.142 or 135.142–135.241. The remainder, resulting from deducting from the total space included in gross tonnage the sum of the cubical contents of the spaces whose deduction from gross tonnage is permitted by this part, shall be the Panama Canal net tonnage of vessels upon which tolls and other charges based upon net tonnage shall be paid by vessels of commerce, army and navy transports, colliers, supply ships, and hospital ships (as defined in $$ 135.1-135.3) for passage through the Panama Canal. One hundred cubic feet, or 2.83 cubic meters, shall constitute one gross or net ton. 8 135.273 Spaces for use of passengers,
not deducted. Spaces for the use, or possible use, of passengers (as defined in $ $ 135.111, 135.112) shall not be deducted from the gross tonnage, except in so far as their deduction may be specifically provided for in $ $ 135.275–135.286. § 135.274 Spaces for stowage of stores
or cargo, not deducted. Spaces available for the stowage of stores (other than boatswain's stores) or cargo shall not be deducted from gross tonnage. In case of army and navy transports, colliers, supply ships, and hospital ships, as defined in $$ 135.1135.3, the term "stores (other than boatswain's stores) or cargo” shall include, in addition to goods or cargo ordinarily
carried as freight on vessels of commerce, the following articles:
(a) On transports, food, stores, luggage, accouterments, and equipment for passengers.
(b) On colliers, coal, coaling gear, and fuel oil not for the use of the colliers.
supply ships, stores, supplies of all kinds, distilling machinery and distilled water (other than fresh water stored in peak tanks for the vessel's own use), machines, tools and material for repair work, mines and mining materials, torpedoes, arms, and ammunition.
(d) On hospital ships, food stores for passengers, medical stores, and hospital equipment.
(e) Guns mounted on transports and supply ships, for defense of the ships, and ammunition required for use in such guns shall not be classed as cargo. § 135.275 Spaces for use of officers and
crew, deducted. The tonnage of the spaces or compartments occupied by, or appropriated to the use of, the officers and crew of the vessel shall be deducted. The term "offcers and crew" shall include the personnel inscribed on the ship's rolls, i.e., the ship's officers, engineers, doctors, apothecary, sick attendants, sailors, apprentices, firemen, mechanics, and wireless operators including clerks, pursers, stewards and other members of the personnel provided by the ship for the care of the passengers as well as armed guards on vessels of commerce. The spaces or compartments occupied by the officers and crew shall include their berthing accommodations, spaces provided for medical attention, including the medicine locker and dispensary, mess rooms, ward and dressing rooms, bath and washrooms, water closets, latrines, lavatories, or privies for their exclusive use, and passageways designed primarily for serving these spaces. Room provided for a pilot and so designated, shall be deducted, but spare rooms and linen lockers are not to be deducted. $ 135.276 Certain spaces
on hospital ships, deducted. On hospital ships the spaces or compartments occupied by doctors, apothecary, and sick attendants duly inscribed on the ship's rolls, shall form part of the deduction under $ 135.275. Spaces provided for the medical attention of the officers and crew of a hospital ship shall likewise be deducted; but spaces fitted
for the transportation, or for the medical 10 tons and in vessels from 150 to 500 attention, of other persons than those tons at not more than 2 percent of the duly listed in the ship's rolls shall not be gross tonnage; in vessels under 150 tons deducted.
at not more than 3 tons. § 135.277 Spaces for use of master, de § 135.282 Spaces used for engineer's ducted.
shops, deducted. The spaces appropriated to the use of Spaces used exclusively for engineer's the master shall be deducted.
shops shall be deducted. This deduction $ 135.278 Cook houses and other rooms
is in no case to exceed 5 percent of the when used exclusively to serve crew,
actual propelling machinery space nor be deducted.
more than 50 tons for any vessel. Cook houses, galleys, bakeries, laun
§ 135.283 Spaces used for donkey endries, and rooms for ice machines, when
gine and boiler, and for pumps other used exclusively to serve the officers and
than for handling cargo, deducted. crew, and the condenser space, and dis The space occupied by donkey engine tilling rooms, when used exclusively for and boiler shall be deducted even condensing and distilling the water for through not connected with the main the officers and crew, shall be deducted. pumps of the ship. The space occupied § 135.279 Spaces used for certain ship’s
by the pumps used exclusively for hangear and for operation and naviga
dling feed water, ballast, bunker fuel, tion, deducted.
or for freeing the ship of water shall also
be deducted, but the space occupied by Spaces used for anchor gear, including the chain locker; steering gear, capstan;
the pumps used for handling cargo shall
not be deducted. the wheel house; the dynamo; the chart room used exclusively for keeping charts,
$ 135.284 Passageways designed for signals, and other instruments of navi serving deducted spaces, deducted. gation; offices for the master, chief offi Passages and passageways designed cer, and chief engineer; lookout houses; primarily for serving deducted spaces spaces for keeping electric searchlights, shall be deducted. radio appliances, and wireless telephone
and apparatus; carpenter shop; fumigating
peak tanks for fresh water for vesand fire-fighting machinery; and other
sel's use, deducted. spaces actually used in navigation of the ship, shall be deducted Such spaces
(a) Water ballast spaces, other than upon vessels of commerce as may be de
spaces in the vessel's double bottom, shall voted to the mounting of guns and to
be deducted if they are adapted only for the storage of ammunition for the guns
water ballast, have for entrance only thus mounted shall be deducted. The
ordinary circular or oval manholes whose deduction of all spaces, enumerated in
greatest diameter does not exceed 30 this section, must be reasonable in ex
inches, and are not available for the tent and be subject to the limitations
carriage of cargo, stores, or fuel. Peak stipulated in § 135.287.
tanks shall also be deducted when
adapted only for carrying fresh water $ 135.280 Space used for storage of for the vessel's own use, can be entered sails, deducted.
only as above stated, and are not availIn case of a ship propelled wholly by able for the carriage of cargo or fuel. sails, any space, not exceeding 242 per If used to carry oil or other fuel these cent of the gross tonnage, used exclu spaces shall be regarded as part of the sively for storage of sails shall be de vessel's fuel space and shall not be subducted.
ject to separate deduction. $ 135.281 Spaces used for boatswain's
(b) Tonnage of tanks may be obtained stores, deducted,
by using liquid capacity times the con
version factor with one-sixth off for Spaces used exclusively for boatswain's stores, including paint and lamp rooms,
frames in case of peak tanks and oneshall be deducted. The deduction is not,
twelfth off in case of wings or deep tanks however, to exceed 1 percent of the gross
when they cannot be readily measured. tonnage in ships of 1,000 tons gross and § 135.286 Spaces appropriated to use of upwards, no more than 75 tons in any passengers as public rooms, deducted. ship however large. In vessels from 500 Spaces appropriated to the use of the to 1,000 tons gross the limit is fixed at passengers solely as public rooms shall
be deducted. These shall include such included in gross tonnage to ascertain spaces as social halls, smoking rooms, net tonnage in the case of vessels promusic rooms, libraries, lounges, dining pelled by engines as in the case of vessels saloons, gymnasiums, children's play not propelled by engines. rooms, elevators, foyers, promenades,
$ 135.323 Spaces occupied by engines, veranda cafes, barrooms, barber shops,
boilers, coal bunkers, etc., deducted. novelty shops, and passageways designed primarily for serving such spaces. Wa
The space occupied by the engines, terclosets, toilets, lavatories and wash boilers, coal bunkers, fuel oil tanks, inrooms designed primarily to serve public
cluding settling tanks, lubricating oil spaces will be considered as part of the
tanks, and shaft trunks of vessels with public spaces and be deducted accord screw propellers; spaces within a closedingly. Waterclosets, toilets, lavatories,
in side-to-side erection that are framed baths and washrooms designed primarily
in around the funnels or that are reto serve nearby staterooms in the same quired for the introduction of light and tier will be considered as part of the
air to the engine room to the extent that staterooms they serve and not subject to
the framed-in spaces around the funnels deduction.
and the light and air casings are located
below the deck or covering of the first or § 135.287 Marking and use of deducted
lowest tier of such erections, if any, on spaces.
the upper deck, as defined in $$ 135.61Each of the spaces enumerated in
135.63, and are contained in closed-in $$ 135.275–135.286, unless otherwise spe side-to-side erections; spaces necessary cifically stated, shall be subject to such
for the proper working of the engines, conditions and requirements as to mark
and spaces occupied by the donkey ening or designation and use or purpose as gine and boiler when situated within the are contained in the navigation or reg boundary of the engine room or within istry laws of the several countries, but the light and air casing above the engine no space, other than fuel spaces deducted
room and when used in connection with under $$ 135.351-135.354, shall be de the main machinery for propelling the ducted unless the use to which it is to
vessel, shall be deducted. When the be exclusively devoted has been appro shaft of screw propellers pass through priately designated by official marking.
open spaces not inclosed within tunnels, In no case, however, shall an arbitrary
the spaces allowed in lieu of the tunnels maximum limit be fixed to the aggregate must be of reasonable dimensions suitdeduction made under 88 135.271 able for the vessel in question. When 135.286.
any portion of the engine or boiler rooms ADDITIONAL DEDUCTIONS ALLOWED FOR is occupied by a tank for fresh water, the VESSELS PROPELLED BY ENGINES spaces thus taken up shall not be
deducted. $ 135.321 Determination of Panama Canal net tonnage of vessels pro § 135.324 Donkey-engine
and boiler pelled by engines.
spaces, when deducted. The Panama Canal net tonnage upon Donkey-engine and boiler spaces, when which tolls and other charges based upon deducted according to $$ 135.381-135.383, tonnage shall be paid by vessels of com shall not be made a separate deduction. merce, army and navy transports, colliers, supply ships, and hospital ships, as
§ 135.325 Certain portion of framed-in defined in $$ 135.1–135.3, propelled by
spaces around funnels and light and
air casings, exempted and not deengines, for passage through the Panama
ducted. Canal, shall be the tonnage remaining after the following deductions have been
The portion of the framed-in spaces made from the gross tonnage. One hun
around the funnels and of the light and dred cubic feet, or 2.83 cubic meters, shall air casings that extend above the deck constitute one gross or net ton. Vessels or covering of the first or lowest tier of propelled partly by sails and partly by
side-to-side erections, if any, on the upengines shall be classed as “vessels per deck, as defined in § 135.84, and surpropelled by engines.”
rounding the said space or spaces are ex
empted from measurement and form no § 135.322 Spaces specified in 88 135.
part of the space or spaces are exempted 271-135.286, deducted.
from measurement and form no part of The spaces specified in 88 135.271 the space deducted under $8 135.323, 135.286, shall be deducted from the space 135.324.
$ 135.326 Limitation propelling deck or a portion thereof, and donkey
power deductions; marking and use engine and boiler spaces when the of deducted spaces.
donkey engine and boiler are situated The deductions made for propelling
within the boundary of the main engine power, including all those provided for in
room, or of the light and air casing above $ $ 135.323–135.325, shall in no case ex
it and when they are used in connection ceed 50 percent of the gross tonnage. In
with the main machinery for propelling other respects the spaces enumerated in
the vessel. When the shafts of screw said 88 135.323–135.325 shall, except as
propellers pass through open spaces not otherwise specifically stated be subject
enclosed within tunnels, the spaces alto the requirements as to designation or
lowed in lieu of tunnels must be of reamarking and use or purpose contained in
sonable dimensions suitable for the vessel the navigation or registry laws of the
in question. When a portion of the space several countries.
within the boundary of the engine or
labor rooms is occupied by a tank or § 135.327 Propelling power deductions, tanks for the storage of fuel oil, lubricathow made.
ing oil, or fresh water, the space conThe deductions made for propelling sidered to be within the engine room shall power provided for in $$ 135.323–135.325 be reduced by the space taken up by the shall be made according to the provisions tank or tanks for fuel oil, lubricating oil, of $$ 135.351-135.353, as the owner of the or fresh water. Note that fuel-oil setvessel may elect.
tling tanks are not to be included in the PROPELLING POWER DEDUCTION FOR VES
propelling-power space, no matter where
situated. Storerooms, dynamos, ice maSELS WITH BUNKERS HAVING MOVABLE
chine, etc., situated in the confines of the PARTITIONS, OR HAVING FUEL-OIL COM
engine room and not bulkheaded off, may PARTMENTS THAT MAY BE USED TO Stow
be included in engine room space. If CARGO OR STORES
bulkheaded off, they shall not be included $ 135.351 Space occupied by engine in engine room space but be given sepa
rooms plus percentage thereof, de rate deductions when they qualify under ducted.
$ $ 135.271-135.286 and then listed under In ships that do not have fixed bunk item 5 on page 2 of the Panama Canal ers, but transverse bunkers with movable certificate. partitions, with or without lateral bunk
§ 135.353 Manner of ascertaining cubiers, and in ships with fuel tanks which
cal content of spaces occupied by may be used to stow cargo or stores, engine room. measure the space occupied by the en
The cubical contents of the abovegine rooms, and add to it for vessels with screw propellers 75 percent and for ves
named spaces occupied by the engine sels with paddle wheels 50 percent of
room shall be ascertained in the folsuch space.
lowing manner: Measure the mean & 135.352 What understood by space oc
depth of the space occupied by the cupied by engine rooms.
engines and boilers from its crown to the
ceiling at the limber strake; measure By the space occupied by the engine rooms is to be understood that occupied
also three, or, if necessary more than by the engine room itself and the boiler
three, breadths of the space at the middle room, together with the spaces strictly
of its depth, taking one of such measurerequired for the working of the engines
ments at each end and another at the and boilers, with the addition of the middle of the length; take the mean of spaces taken up by the shaft trunks in such breadths; measure also the mean vessels with screw propellers, the spaces length of the space between the foremost which enclose the funnels and the cas and aftermost bulkheads or limits of its ings necessary for the admission of light length, excluding such parts, if any, as and air into the engine room to the ex are not actually occupied by, or required tent that such spaces are located below for, the proper working of the engines the upper deck (as defined in $$ 135.61 and boilers. Multiply together these 135.63) or below a deck with openings, three dimensions of length, breadth, and usually designated as tonnage openings, depth, and the product will be the cubical which may be so closed as to permit the contents of the space below the crown. carriage of cargo or stores under the Then, by multiplying together the length,