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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 these drawings are to be indicated
general system may prevail
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 use of structures and hull spaces; and
below: 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 length necessary to insure that accurate dimen
from the upper end thereof to the lower
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., 1f 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 $ 2.10 Measurements to be taken at an
rod is fair with the upper end of the fixed
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 bet 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 +6 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 8.96 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 door 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 irmly 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 cbalk 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 certiicates, a girting galvanized chain of an approved make is required. $ 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, dcducting therefrom the thickness of the "false ceiling" on
each side. If, however, there is a ceiling (b) Should ceiling be fitted on the fitted on the frames in addition to the above mentioned bottom members, the "false ceiling," take the breadths to the register depth shall be measured to the ceiling on the frames, making no allow- top of same and to this dimension shall ance for the "false ceiling."
be added the height of grounds, battens (c) Cargo battens, insulation. Para- or other type of support for the ceiling. graph (a) of this section applies to cargo (See Figures 4 and 5 ($ 2.65).) battens (spar ceiling) and refrigeration (c) If the vessel is measured in parts, insulation,
as explained later, the register depth is
taken at one-half the tonnage length of $ 2.18 Register length.
the vessel. (a) The length measured on the ton
§ 2.21 Upper deck to the hull. nage deck, from the fore part of the outer planking (where it is rabbeted) on The uppermost complete deck, which the side of the stem of wooden vessels, or extends from stem to stern and from side fore end of lap of outer plating of steel or to side at all points of its length and beiron vessels, to the after side of the main low which there are no openings through sternpost, shall be accounted the ves- the hull as required in shelter deck sel's register length. (See Figures 2 and spaces and also having its hatchways or 3 (2.65).)
other openings provided with means for (b) In the case of screw vessels with closing them against the action of the no sternpost, take the length to the for- sea and weather upon the space below ward side of the rudder-stock or line of enclosed by the sides of the vessel, maksame extended through the deck.
ing the said space a fit place for the (c) The register length of scows and
stowage of general cargo, is to be conbarges, with a square bow and stern slop
sidered the upper deck to the hull. ing up from the bottom to the deck, and with neither stem nor sternpost, is to be & 2.22 Enumerating the decks. taken on the deck from the extreme point of the hull at the bow to the ex
In enumerating the number of decks, treme point of the hull at the stern;
only those which are without such openthat is, the over-all length of the hull,
ings as exempt the spaces beneath from not including guards or rubbing strakes,
being included in the tonnage under the is to be considered the register length of upper deck are to be considered. Other such vessel.
decks, if any, containing such openings
as exempt the spaces beneath from in$ 2.19 Register breadth.
clusion in tonnage should be separately (a) A measure from the outboard face described after the number of decks of the outer skin on one side to the same proper; e. g., "Two decks and shelter point opposite, taken at or below the
deck," or as the case may be. Partial upper deck and at the widest part of the
decks, forward or aft, such as orlop hull is the register breadth. (See Fig
decks, are not considered as decks. ure 4 ($ 2.65).)
§ 2.23 Register height. (b) A practical method for finding the register breadth is, to add twice the sum If the vessel has three or more decks to of the depth of the vessel's side frames the hull, then the height from the top of and thickness of outer skin, plus an the tonnage deck planking and/or platallowance for thickness of ceiling, insu
ing to the under side of the planking lation or cargo battens if fitted, to the
and/or plating of the uppermost deck greatest tonnage breadth.
shall be deemed the register height of $ 2.20 Register depth.
the uppermost deck above the tonnage
deck. (a) The register depth is taken at the middle of the tonnage length from the § 2.24 Round of beam. under side of the tonnage deck, or line of same, down to the top of the floors at the
(a) The round of beam (camber) is side of the keelson; or to the ordinary
the perpendicular distance down from koor timbers or plates when fitted; or to the crown of the under side of the tonthe inner bottom plating (tank top) of a nage-deck plank or plating at the center cellular double bottom; as the case may to a line stretched athwart the vessel be , in a direction perpendicular to the 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 measurement. (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 flat 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 tonnage 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 à distance below the tonnage deck equal to onethird 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 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
1 which, in way of tonnage sections, has a missible thickness of ceiling, if any,
straight fall from the center line to the thereunder. Fi wings the tonnage depth of each section Referring to Figure 16 (§ 2.65), obme will terminate at one-half height of fall. serve that after the deck is laid the See Figure i3 ($ 2.65).)
upper breadth (represented by the line
U B) passes through the deck on each $ 2.29 Tonnage depths.
side. Hence, it is impossible to take it (a) The tonnage depth. The depth at its true position. In such cases take i generally referred to as "the tonnage it on the deck, allowing within the ex
depth" is located at the middle point of tended line of frames the thickness of e division of the tonnage length and is the ceiling if any on the frames under
found in a manner similar to the other deck, as shown by line T B in the figure. e depths of transverse sections.
Owing to deck-beam shelves or other (bi Tonnage depth in a vessel meas- obstructions, it can be more convenbere ured in parts. Should a vessel be re- iently and accurately taken here than
quired to be measured in parts, and each under the deck, and, besides it will be part measured as a separate unit; then only a few inches from its true position. & tonnage depth shall be found for each
In vessels which have upright sides the part or unit at one-half its tonnage sai breadth so taken will be correct, length. (See Figure 14 ($ 2.65).)
but in the case of vessels with inclining (C) Tonnage depth is the first depth
sides the necessary allowance must be measured. The tonnage depth governs made for the deviation of the sides from the number of parts into which it and all
the upright in the few inches above the the remaining depths of the part in
true position of the said breadth. which said depth is located, is divided.
(c) Bottom breadths. Bottom (d) Divisions of tonnage depth. If
breadths are taken only so far as the the tonnage depth at the middle of the
fiat of the floor extends. (See B B, Figtonnage length of the vessel or part of same does not exceed 16 feet, divide each
ures 4 and 5; Figure 15; and B B, Fig
ures 17 and 18 ($ 2.65).) depth into 4 equal parts; but if the depth
When bottom frames rise immediately at the middle of said length exceeds 16 feet, divide each depth into 6 equal
from the keelson, or combined keel and parts.
keelson, and bona fide floor timbers or
are le) Intervals. The common intervals
floor plates not fitted, bottom between the points of division of depths,
breadths are equal to the breadth of also one-third common intervals are to
keelson, or combined keel and keelson as s be carried to the nearest hundredth of a the case may be. (See B B, Figure 19 foot.
($ 2.65).) (f) Purpose for dividing tonnage The bottom breadths of transverse depths. Depths are divided to indicate sections of vessels of longitudinal conpoints at which tonnage breadths are to struction falling in the hold where there be measured.
is no double bottom and where there is
a dead rise of the bottom out to the * $ 2.30 Tonnage breadths.
sides of the vessel may be considered to (a) Breadths. An inside horizontal be equal to that part of the bottom platbreadth is to be measured at each point ing not affected by dead rise. of division of the depth marked on the (d) Bottom breadths in case of rise sliding rods placed in position as directed or fall of double bottom. Bottom in $2.13(b) and also at the upper and breadths falling in way of a double bot
lower points of the depth. Extend each tom the top of which rises or falls from E measurement to the inboard face of the the midship longitudinal plane to the I ordinary frames, or line of same, or wings are measured from and to the ine inboard face of ceiling, or battens, or board end of the frame brackets (or insulation of average thickness if fitted. ceiling thereon if fitted), connecting the See Figure 15 ($ 2.65).) Care must be double bottom with the frames. (See B taken that the sections shall be parallel B, Figures 12 and 13 ($ 2.65).) 3 each other and at right angles to the
8 2.31 Measuring the tonnage length. axis of the vessel.
(b) Upper breadth. In finding the (a) The cubic capacity of the space upper breadth of each transverse section below the tonnage deck is determined make no allowance for the excess of the by use of the tonnage length todeck-beam shelves, etc., over the per- gether with the areas of a prescribed