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etc., shall be submitted to the Commis- been made from the gross register tonsioner for his decision, and shall be ac- nage shall be deemed the net register companied by blueprints or sketches of tonnage. the spaces in question giving all the facts

(b) In ascertaining the net tonnage bearing on same.

no space may be deducted unless it has § 2.2 Officials authorized to admeasure previously been included in the gross tonvessels.

nage and certified, showing the purpose

for which used. (a) Before any vessel shall be registered, enrolled, or licensed she shall be 8 2.7 The marine document. measured by an officer of the customs at the port or place where she may be.

The marine document of every vessel (b) A vessel is not to be measured un

shall show the date and place of build; less she is required by law to be regis

the register length, breadth, depth, and, tered, enrolled or licensed, or otherwise

in vessels of more than two decks, the specially provided for.

height of the upper deck to the hull above

the tonnage deck; the number of decks § 2.3 Purpose for which measurements and masts; build as to her stem and are taken.

stern; capacity under the tonnage deck, (a) Tonnage measurements are taken that of the between decks, and also sepafor the purpose of ascertaining the in- rately, permanently enclosed spaces on ternal capacity of measurable spaces. or above the upper deck to the hull avail

(b) All measurements are to be taken able for cargo or stores or for the accomin feet and fractions of feet, and all modation of passengers (provisionally) fractions of feet shall be expressed in or crew, and the omitted spaces, whether decimals.

open or closed in, on, above, or below the $ 2.4 Register ton.

upper deck; the gross tonnage; items of

deduction; and net tonnage. A register ton is a volume of 100 cubic feet.

$ 2.8 Application for measurement. $ 2.5 Gross register tonnage.

The builder of a new vessel required

to be admeasured, or the person having (a) The gross tonnage referred to in the following sections is the gross register

supervision of changes and/or alterations

affecting a vessel's register tonnage, is tonnage; that is, the gross tonnage ex

obliged to make application for adclusive of all permissible exempted

measurement or tonnage adjustment as spaces.

the case may be, in writing, to the collec(b) The gross register tonnage of a

tor of customs of the district in which vessel shall consist of the sum of the

the vessel is located. Such application following items:

shall be made before cargo or ballast is (c) The cubical capacity below the

taken on, and in case uf a new vessel, betonnage deck, excluding exemptible wa

fore boilers or engine is installed or comter ballast spaces within the measureable portion of the vessel;

partments partitioned off. (d) The cubical capacity of each be- § 2.9 Drawings. tween deck space above the tonnage

(a) Plans to be filed. In order to fadeck; (e) The cubical capacity of the per

cilitate admeasurement, there shall be manent closed-in spaces on the upper

furnished by the vessel's builder or owner

to the collector of customs for the district deck available for cargo or stores, or for +he accommodation of passengers and/

in which the vessel will be admeasured,

either with the application for admeasor crew; (f) All permanent closed-in spaces sit

urement or a reasonable period before

admeasurement is scheduled to comuated elsewhere available for cargo or stores, or for the accommodation of the

mence, blueprints or drawings of the

following: crew, or for the charts, except cabins or

(1) A drawing of the cross section in staterooms for passengers constructed

which is shown the construction of the entirely above the first deck which is not

double bottom, if there be one; a deck to the hull;

(2) An inboard view of the longitu(g) The excess of hatchways.

dinal section, showing the double bot& 2.6 Net register tonnage.

tom, its use or uses, if existing, otherwise (a) The tonnage of a vessel remaining the floors, the compartments for water after the authorized deductions have ballast, other than the double bottom, the decks, the superstructures, hatch- usually when the decks are laid, the hold ways, etc.;

cleared of encumbrances to admit the (3) Deck plans showing the arrange- required depths and breadths being ment and uses of different compart- properly taken; before the engine and ments and deductible spaces;

boilers are installed and accommoda(4) Drawings showing the arrange- tions are partitioned off. ment of the engine, boiler, and fuel

$ 2.11 Uniform system required. compartments; and

(5) A tonnage plan showing half (a) The following directions are given breadths of the sections at the points of showing the progressive steps to be foldivision of the tonnage length of the lowed in the process of admeasurement. vessel into a certain number of equal It is important not only that the rules parts in accordance with the rules for

be followed, but that required measurethe measurement of spaces under the

ments be taken and calculations made

in a uniform and correct manner that tonnage deck. The scale or scales of

one general system may prevail these drawings are to be indicated

throughout the service respecting this thereon.

subject. The collector of customs is to be ad

(b) Measurements taken aboard are vised of any subsequent changes in the

to be recorded in the "Memorandum of vessel and furnished copies of the cor

Dimensions” known as Form 1413. rected plans, or a statement of such changes.

$ 2.13 Measuring instruments. If there are no blueprints or drawings (a) The measurements should be available and if the collector is satisfied made with a waterproof tape, graduated that it is impracticable to require such into feet and tenths of a foot, and as plans to be prepared and made available, nearly inelastic as possible. considering the size and nature of the (b) Sliding rods which are of three vessel as well as the cost and time in- sizes: One 3 feet long for taking depths volved, the vessel shall be measured with- from 3 to 5.8 feet; another 6 feet long out requiring their production.

for taking depths from 6 to 11 feet, or, (b) Sketches. When blueprints or with the extension piece attached, to 16 drawings are not produced, necessary feet; and a third one 11 feet long for rough sketches may be made during the taking depths from 11 to 21 feet, or, course of admeasurement showing the with the extension piece attached, to 26 inboard profile, the midship cross-sec- feet. The movable or index rod in each tion, the hull and deck arrangements,

has an arrow index traversing a decimal and related matters, recording any nec

scale on the fixed rod. Greater depths essary dimensions and showing details

may be taken by inserting into the ends of important features such as the depth

of the index rods, an extension piece, of side and bottom frames or floor

provided with sockets for this purpose timbers; the dimensions, location, and

one or more joints of lift rods described

below: use of structures and hull spaces; and the thickness of the inner and outer skin. The fixed rod is graduated in feet (in Such rough sketches shall be retained

red) and tenths and half-tenths (in black);

and when the ends of the rods are well and filed with the other admeasurement

together the arrow on the index rod points papers. The rough sketches made shall

to the figure indicating the constant length not be redrawn to scale unless the ad- of the fixed rod, and as the index rod is measurer is satisfied that such action is moved up the arrow indicates the lengt' necessary to insure that accurate dimen

from the upper end thereof to the low

end of the fixed rod. Bear in mind, howsions have been lifted, to avoid the neces

ever, that when you use any of the attachsity for readmeasurement, or to insure ments referred to above you must add to against a claim of error which may

the reading on the fixed rod the net length reasonably be expected to be made in a

of the attachment used; e. g., if the 6-foot

rod is extended to its limit, 11 feet, which particular case by the owner or agent. is reached when the arrow on the index

rod is fair with the upper end of the fixed $ 2.10 Measurements to be taken at an

rod, and the extension piece is attached, early stage.

which is done by slipping the bands on the Admeasurement should begin as soon

lower end of it over the upper end of the

Index rod until the upper edge of the as the vessel is sufficiently advanced in

upper band is fair with the upper end of construction to permit its being done, the index rod, and by fastening (on the

groove side of the index rod) with set screws in the said bands, the length will not be 11 feet, as shown by the reading, but 16 feet, the reading plus the increment due to the attachment (11 feet +5 feet). This increment may be further increased by inserting into the end of the extension piece one or more joints of lift rods, each of which is about 3.95 feet when adjusted.

At the station of the area to be measured in single-deck vessels the rod is to be placed on the ceiling, or floor beam or timber when no ceiling is present, alongside the keelson or line of the keel, perpendicular or square thereto, and also parallel to the middle longitudinal plane of the ship, and forced up firmly under the deck and fixed in such position by the set screws; from the depths thus found take one-third of the round or one-half of the pitch of beam to get the depth of the area.

The depth of an area taken as above is to be divided into the required number of equal parts. (See § 2.29 (d). With the rod fixed in position as above, set off on it from its lower end one of these equal parts, or common interval between the breadths, using white or other colored chalk or material that will make a visible mark, which gives the position of the first breadth above the bottom breadth, and from this when the rod is taken down the positions of the remaining breadths are to be set off at the said common interval.

The positions of all the breadths being thus severally marked on the rod, it is then to be set up again and firmly fixed or held in position, and the breadths may be readily and correctly measured by means of the tape held at right angles across the rod at each of the positions marked thereon.

In measuring vessels with more than one deck, where the second deck from the bottom is the tonnage deck, it will be necessary to use two of these rods in combination, one directly over the other, one in the hold under the first deck, as directed for single-deck vessels, and the other in the space between this deck and the tonnage deck. In this combination the tonnage depth is found by adding together the two depths and the thickness of the deck between the rods and deducting from this combined depth onethird of the round or one-half pitch of beam; then proceed as before directed.

(c) A 2-foot rule with a hinge is required for taking the rake of the bow and stern and for other purposes.

(d) A carpenter's square will be found useful for setting the sliding rod perpendicular to the keelson.

(e) For taking the breadths in the hold which are beyond the reach of the measuring officers two lift rods will be needed, each about 8 feet long (made by joining two sections), one having a pulley at the end over which the tape may be drawn when the rods are held in po

sition and the other an attachment for holding the ring at the end of the tape.

(f) For transferring the location of the stations or ordinates of the transverse sections from the deck to the keelson, and sometimes, for finding registered breadth, a plumb line and bob are needed.

(g) For measuring laden vessels for Panama or Suez Canal tonnage certificates, a girting galvanized chain of an approved make is required. 8 2.14 Stem.

A vessel's stem is to be described according to its contour; i.e., straight, raked, curved or square. § 2.15 Stern.

Describe the stern according to its shape at the after end below the upper deck or line of same, as round, elliptical, square or sharp. § 2.16 Masts.

In addition to what are commonly known as masts, spars set up at the center line of the bridging at the top of king-posts of certain vessels for signals and wireless antennae, etc., are to be considered as masts. The number of king-posts and derrick posts, etc., independent of the supported masts are to be separately stated after the number of said masts; e. g., “Two masts and eight king-posts,” or as the case may be. $ 2.17 Ceiling, cargo battens, etc.

(a) Ceiling. Ceiling hereafter referred to is considered the permanent planking fitted directly on the inboard side of the frames, or floors, or the top of the double bottom. The maximum allowance for ceiling is 3 inches on the bottom and 3 inches on each side. When ceiling is found to be less than 3 inches thick, allow the actual thickness thereof; that is, take dimensions to the face of the ceiling so found. Depths and breadths shall not be decreased due to grounds supporting ceiling nor shall allowance be made for ceiling on the under side of deck beams.

(b) False ceiling. In small vessels with "false ceiling" in a portion of their cabins, in their holds, or forming a part of their seats or lockers, etc., therein, and which stands off from their framesthat is, not fitted to them as ordinary ceiling-take the breadths through the said “false ceiling” to the inner faces of the vessel's frames, deducting therefrom the thickness of the "false ceiling" on

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each side. If, however, there is a ceiling fitted on the frames in addition to the “false ceiling," take the breadths to the ceiling on the frames, making no allowance for the "false ceiling.”

(c) Cargo battens, insulation. Paragraph (a) of this section applies to cargo battens (spar ceiling) and refrigeration insulation. § 2.18 Register length.

(a) The length measured on the tonnage deck, from the fore part of the outer planking (where it is rabbeted) on the side of the stem of wooden vessels, or fore end of lap of outer plating of steel or iron vessels, to the after side of the main sternpost, shall be accounted the vessel's register length. (See Figures 2 and 3 ($ 2.65).)

(b) In the case of screw vessels with no sternpost, take the length to the forward side of the rudder-stock or line of same extended through the deck.

(c) The register length of scows and barges, with a square bow and stern sloping up from the bottom to the deck, and with neither stem nor sternpost, is to be taken on the deck from the extreme point of the hull at the bow to the extreme point of the hull at the stern; that is, the over-all length of the hull, not including guards or rubbing strakes, is to be considered the register length of such vessel. $ 2.19 Register breadth.

(a) A measure from the outboard face of the outer skin on one side to the same point opposite, taken at or below the upper deck and at the widest part of the hull is the register breadth. (See Figure 4 ($ 2.65).)

(b) A practical method for finding the register breadth is, to add twice the sum of the depth of the vessel's side frames and thickness of outer skin, plus an allowance for thickness of ceiling, insulation or cargo battens if fitted, to the greatest tonnage breadth. § 2.20 Register depth.

(a) The register pth is taken at the middle of the tonnage length from the under side of the tonnage deck, or line of same, down to the top of the floors at the side of the keelson; or to the ordinary floor timbers or plates when fitted; or to the inner bottom plating (tank top) of a cellular double bottom; as the case may be, in a direction perpendicular to the keel.

(b) Should ceiling be fitted on the above mentioned bottom members, the register depth shall be measured to the top of same and to this dimension shall be added the height of grounds, battens or other type of support for the ceiling. (See Figures 4 and 5 ($ 2.65).)

(c) If the vessel is measured in parts, as explained later, the register depth is taken at one-half the tonnage length of the vessel. § 2.21 Upper deck to the hull.

The uppermost complete deck, which extends from stem to stern and from side to side at all points of its length and below which there are no openings through the hull as required in shelter deck spaces and also having its hatchways or other openings provided with means for closing them against the action of the sea and weather upon the space below enclosed by the sides of the vessel, making the said space a fit place for the stowage of general cargo, is to be considered the upper deck to the hull. § 2.22 Enumerating the decks.

In enumerating the number of decks, only those which are without such openings as exempt the spaces beneath from being included in the tonnage under the upper deck are to be considered. Other decks, if any, containing such openings as exempt the spaces beneath from inclusion in tonnage should be separately described after the number of decks proper; e. g., "Two decks and shelter deck," or as the case may be. Partial decks, forward or aft, such as orlop decks, are not considered as decks. § 2.23 Register height.

If the vessel has three or more decks to the hull, then the height from the top of the tonnage deck planking and/or plating to the under side of the planking and/or plating of the uppermost deck shall be deemed the register height of the uppermost deck above the tonnage deck. $ 2.24 Round of beam.

(a) The round of beam (camber) is the perpendicular distance down from the crown of the under side of the tonnage-deck plank or plating at the center to a line stretched athwart the vessel from end to end of the top of the beam and is to be ascertained at every place where it is to be used in the measurebent. (See Figures 6 and 16 ($ 2.65).)

(b) The round of beam of the tonnage-deck, which must be known before taking the tonnage length, as well as before measuring the depths of the tonnage sections, may be taken either at the under side of the deck by stretching a small line tightly from end to end at the top of the beam, which will show the round or camber of the beam at the center; or it may be taken, if more convenient, at the upper side of the deck by stretching a line tightly across, held at equal heights from the deck at each side of the vessel, so as just to touch the crown of the deck at the middle line; then the distance from the deck to the line at the vessel's sides gives the round of beam. (See Figure 6 ($ 2.65).) It is necessary to take the round of beam at each point of division of the length except when the vessel has a fiat deck or one practically so. In lieu of the above methods, it may be ascertained on the basis of one-fourth of an inch to the foot of beam at each section in iron or steel vessels of the usual camber of beam. This method is more accurate and easier of application than the others.

(c) When the round of beam is 0.15 foot or less, it may be ignored. § 2.25 Pitch of beam.

(a) In vessels whose tonnage deck has a pitch instead of a round from its side at the shell plating to its center, find the height of the pitch of the beam at each tonnage section. It may be done in any practical manner.

(b) The height of the pitch of the beam is the perpendicular distance from the apex at the under side of the tonnage deck plank or plating at the center of the deck down to a straight line from end to end of the top of the beam. (See Figure 7 ($ 2.65).) § 2.26 Tonnage deck.

(a) The tonnage deck is the upper deck to the hull in vessels having not more than two decks, and the second deck from the keel in vessels having more than two decks.

(b) If the tonnage deck consists of several partial decks extending with breaks from stem to stern, and if the partial decks are at different heights, the line of the lowest deck will be taken as the tonnage deck, and the headroom

above such line under the higher deck or decks will be measured as a break.

(c) Engine and boiler casings, peak tanks and cofferdams are not considered as breaking the continuity of a deck. (See Figures 8 and 9 ($ 2.65).) § 2.27 Tonnage length.

The tonnagc length is the longitudinal distance on the under side of the tonnage deck, or line of same from a point where the line of the inboard faces of the side frames, or ceiling thereon if any, intersects the side of the stem, to a point aft on the inboard face of the stern timber or cant frame, or ceiling if fitted thereon. (See Figures 10 and 11 ($ 2.65).) § 2.28 Depth of a transverse section.

(a) Depth. The depth of a tonnage section is a measurement taken at its proper point of division of the tonnage= length, from a point at a distance below the tonnage deck equal to one third of the round or one-half of the pitch of the beam, down to the upper side of the floor timbers or floor plates; or bottom floors alongside the keelson; or longitudinals; or the tank top of a cellular double bottom, as the case may be.

(b) Ceiling. If ceiling is fitted on the bottom floor members, depths of transverse sections terminate on the upper face of the ceiling of average thickness. (See Figure 4 ($ 2.65).) For tonnage depths where ceiling is fitted on tank top, see Figure 5 ($ 2.65).

(c) Raised platform. In vessels with a raised platform in the bottom and no ceiling fitted on the bottom frame members, the depths are to be taken down through the platform to the upper side of the floor timbers or floor plates as described above, deducting therefrom the thickness of the ceiling of the platform in question.

(d) Depths in way of interruptions to tonnage deck. Should depths of transverse sections fall where the tonnage deck is interrupted, due to a break, hatches, etc., then depths are taken from the line of continuation of the tonnage deck.

(e) Rise of double bottom. In vessels having a double bottom the tank top of which, in way of tonnage sections, rises to from the center line to the wings, the tonnage depth of each section will terminate at one-half height of the dead rise. (See Figure 12 (§ 2.65).)

(f) Fall of double bottom. In vessels having a double bottom the tank top of

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