the above prescribed hours, and the volume and duration of the required services are uniformly such as to require, of themselves or in immediately consecu tive combination with other essential customs activities of the port, the full time of one or more customs employees, the necessary number of regular tours of duty to furnish such services on all days of the year except Sundays and national holidays may be established with the approval of the Commissioner of Customs. (g) Customs services shall be furnished private interests otherwise than as specified in this section only in accordance with the provisions of § 24.16 of this chapter. (a) The customs seal of the Uni States, consisting of the national ar within a circle according to the des furnished by the Treasury Departme sl.all be impressed upon all official do ments requiring the impress of a seal (b) The impress of the seal is necessary on documents passing with the Customs Service. The seal shall impressed on marine documents, and landing certificates, certificates weight, gauge, or measure, and simi classes of documents for outside terests. (c) The official seal shall not be us in the manner of a notary seal to in cate authority to administer oat 17 Ceiling, cargo battens, etc. 2.28 Depth of a transverse section. 2.31 Measuring the tonnage length. 2.32 Divisions of tonnage length. 2.33 Transfer of location of sections to 2.34 Transverse areas, rule for finding. 2.36 Vessels having side tanks may be Appendix to certificate of registry. Measurement of Government vessels. Table A of common intervals when tonnage depth is 16 feet or less. Table B of common intervals when ton- Definitions of enclosures on or above Definitions of items of deduction. Definitions of structural terms, etc. 2.72 Suez and Panama Canal certificates. AUTHORITY: §§ 2.0 to 2.72 issued under R. S. 161, 4153, as amended, secs. 2, 3, 23 Stat. 118, as amended, 119, as amended, sec. 4, 28 Stat. 743, as amended; 5 U. S. C. 22, 46 U.S.C. 2, 3, 77, 79. Additional authority is cited in parentheses following the sections The regulations in this part are not retroactive, i.e., they do not apply to vessels the keels of which were laid prior to the date the rules in this part become effective. The regulations in this part become effective March 1, 1940. § 2.1 Authority of Commissioner. (a) The Commissioner of Customs is charged with the supervision of the laws relating to the admeasurement of ves- sels, and on all questions of interpreta- tion growing out of the execution of the laws relating to this subject his decision (b) The Commissioner of Customs shall, in the following sections, be re- ferred to as the Commissioner. (c) Doubts arising in the minds of the admeasurers concerning decks to the hull, enclosures on or above the upper deck, shelter decks, method of procedure, etc., shall be submitted to the Commis- sioner for his decision, and shall be ac- companied by blueprints or sketches of measured by an officer of the customs at the port or place where she may be. (b) A vessel is not to be measured unless she is required by law to be registered, enrolled or licensed, or otherwise specially provided for. § 2.3 Purpose for which measurements are taken. (a) Tonnage measurements are taken for the purpose of ascertaining the internal capacity of measurable spaces. (b) All measurements are to be taken in feet and fractions of feet, and all fractions of feet shall be expressed in decimals. § 2.4 Register ton. A register ton is a volume of 100 cubic feet. § 2.5 Gross register tonnage. (a) The gross tonnage referred to in the following sections is the gross register tonnage; that is, the gross tonnage exclusive of all permissible exempted spaces. (b) The gross register tonnage of a vessel shall consist of the sum of the following items: (c) The cubical capacity below the tonnage deck, excluding exemptible water ballast spaces within the measureable portion of the vessel; (d) The cubical capacity of each between deck space above the tonnage deck; (e) The cubical capacity of the permanent closed-in spaces on the upper deck available for cargo or stores, or for the accommodation of passengers and/ or crew; (f) All permanent closed-in spaces situated elsewhere available for cargo or stores, or for the accommodation of the crew, or for the charts, except cabins or staterooms for passengers constructed entirely above the first deck which is not a deck to the hull; (g) The excess of hatchways. § 2.6 Net register tonnage. (a) The tonnage of a vessel remaining after the authorized deductions have been made from the gross register tonnage shall be deemed the net register tonnage. (b) In ascertaining the net tonnage no space may be deducted unless it has previously been included in the gross tonnage and certified, showing the purpose for which used. § 2.7 The marine document. The marine document of every ves shall show the date and place of buil the register length, breadth, depth, a in vessels of more than two decks, t height of the upper deck to the hull ab the tonnage deck; the number of dec and masts; build as to her stem a stern; capacity under the tonnage de that of the between decks, and also sep rately, permanently enclosed spaces or above the upper deck to the hull ava able for cargo or stores or for the acco modation of passengers (provisionall or crew, and the omitted spaces, wheth open or closed in, on, above, or below t upper deck; the gross tonnage; items deduction; and net tonnage. § 2.8 Application for measurement. The builder of a new vessel requir to be admeasured, or the person havi supervision of changes and/or alteratio affecting a vessel's register tonnage, obliged to make application for a measurement or tonnage adjustment the case may be, in writing, to the colle tor of customs of the district in whic the vessel is located. Such applicatio shall be made before cargo or ballast taken on, and in case of a new vessel, b fore boilers or engine is installed or con partments partitioned off. § 2.9 Drawings. (a) Plans to be filed. In order to fa cilitate admeasurement, there shall furnished by the vessel's builder or own to the collector of customs for the distri in which the vessel will be admeasure either with the application for admea urement or a reasonable period befo admeasurement is scheduled to con mence, blueprints or drawings of th following: (1) A drawing of the cross section which is shown the construction of th double bottom, if there be one; (2) An inboard view of the longit dinal section, showing the double bo tom, its use or uses, if existing, otherwis the floors, the compartments for wat ballast, other than the double botton the decks, the superstructures, hatch ways, etc.; (3) Deck plans showing the arrange ment and uses of different compart ments and deductible spaces; (4) Drawings showing the arrange ment of the engine, boiler, and fu compartments; and (5) A tonnage plan showing half breadths of the sections at the points of division of the tonnage length of the vessel into a certain number of equal parts in accordance with the rules for the measurement of spaces under the tonnage deck. The scale or scales of these drawings are to be indicated thereon. The collector of customs is to be advised of any subsequent changes in the vessel and furnished copies of the corrected plans, or a statement of such changes. If there are no blueprints or drawings › available and if the collector is satisfied that it is impracticable to require such plans to be prepared and made available, considering the size and nature of the vessel as well as the cost and time involved, the vessel shall be measured with· out requiring their production. (b) Sketches. When blueprints or drawings are not produced, necessary rough sketches may be made during the course of admeasurement showing the inboard profile, the midship cross-section, the hull and deck arrangements, and related matters, recording any necessary dimensions and showing details of important features such as the depth of side and bottom frames or floor timbers; the dimensions, location, and use of structures and hull spaces; and the thickness of the inner and outer skin. Such rough sketches shall be retained and filed with the other admeasurement papers. The rough sketches made shall not be redrawn to scale unless the admeasurer is satisfied that such action is necessary to insure that accurate dimensions have been lifted, to avoid the necessity for readmeasurement, or to insure Eagainst a claim of error which may reasonably be expected to be made in a particular case by the owner or agent. (a) The following directions are given showing the progressive steps to be followed in the process of admeasurement. It is important not only that the rules be followed, but that required measurements be taken and calculations made in a uniform and correct manner that one general system may prevail throughout the service respecting this subject. (b) Measurements taken aboard are to be recorded in the "Memorandum of Dimensions" known as Form 1413. § 2.13 Measuring instruments. (a) The measurements should be made with a waterproof tape, graduated into feet and tenths of a foot, and as nearly inelastic as possible. (b) Sliding rods which are of three sizes: One 3 feet long for taking depths from 3 to 5.8 feet; another 6 feet long for taking depths from 6 to 11 feet, or, with the extension piece attached, to 16 feet; and a third one 11 feet long for taking depths from 11 to 21 feet, or, with the extension piece attached, to 26 feet. The movable or index rod in each has an arrow index traversing a decimal scale on the fixed rod. Greater depths may be taken by inserting into the ends of the index rods, an extension piece, provided with sockets for this purpose one or more joints of lift rods described below: The fixed rod is graduated in feet (in red) and tenths and half-tenths (in black). and when the ends of the rods are well together the arrow on the index rod points to the figure indicating the constant length of the fixed rod, and as the index rod is moved up the arrow indicates the length from the upper end thereof to the lower end of the fixed rod. Bear in mind, however, that when you use any of the attachments referred to above you must add to the reading on the fixed rod the net length of the attachment used; e. g., if the 6-foot rod is extended to its limit, 11 feet, which is reached when the arrow on the index rod is fair with the upper end of the fixed rod, and the extension piece is attached, which is done by slipping the bands on the lower end of it over the upper end of the index rod until the upper edge of the upper band is fair with the upper end of 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 position 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 trans 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 fitted on the frames in addition to the "false ceiling," take the breadths to the |