to the gross tonnage and also to the propelling machinery space of a mechanically propelled vessel to entitle her to 32 percent of her gross tonnage for propelling-power deduction when granted by the collector upon request of her owner or owners:

Find 13.1 percent of the gross tonnage inclusive of excess hatchways. Find the difference between this percent and the tonnage of the propelling machinery space below the upper deck to the hull. Increase this difference by 15 percent of itself, which gives approximately the amount of light and air space or spaces to be added to the gross tonnage defined above, and also to the propelling machinery space below said upper deck. The gross register tonnage in such a case is the gross tonnage as defined above, plus light and air addition, less one-half of 1 percent of said light and air addition, which one-half percent is additional allowance for excess hatchways due to addition of light and air to gross tonnage. EXAMPLE

Gross tonnage, exclusive of light and air and hatchways----Excess of hatchways (based on the above)

5,675.95

67.87

§ 2.60 Verification of calculations, diagram of areas, and certification of results.

(a) Calculations to be verified and diagram of areas made. Calculations must be verified at least twice and a diagram of half breadths for areas made. (See Figures 52 and 53 (§ 2.65).)

(b) Certification of results. The deductions having been made from the gross tonnage and the remainder or net tonnage having been properly marked on the main beam, the surveyor or measuring officer will certify the result to the collector on Form 1322.

§ 2.60a Marking net tonnage and official number on vessel.

(a) The official number of a vessel, preceded by the abbreviation "NO.", and the net tonnage, preceded by the word "NET", shall be marked in a conspicuous place on her main beam at the expense of the owner or master, in Arabic numerals of the block type at least three inches in height, when the size of the main beam will permit. If the main beam is of wood, it shall be carved or branded in figures not less than threeeighths of an inch in depth. If the main beam is of iron or other metal, the offcial number and net tonnage shall be outlined by punch marks and painted over with oil paint in a light color on a dark background or a dark color on a light background.

(1) In the case of a vessel which is assigned two net tonnages under the provisions of § 2.87 (b), both net tonnages shall be marked on the vessel. Immediately following the lower net tonnage there shall be marked a copy of the tonnage mark and the triangle which may be scaled to the size of the numerals.

(2) In the case of a vessel which is assigned a single net tonnage under the provisions of § 2.87(c), a copy of the tonnage mark and the triangle shall be similarly marked after the net tonnage as provided by subparagraph (1) of this paragraph.

(b) The beam at the forward end of the largest hatch on the weather deck which is generally located forward of amidships shall be considered the main beam for the purposes of these regulations. In the case of a vessel which does

not have a hatch on the weather deck, any structural member which is integral to the hull may be considered the main beam.

(c) The official number awarded to a vessel shall pertain only to that vessel. If a vessel, having once received an official number, is rebuilt or redocumented, the number originally awarded shall be retained.

[28 F.R. 14553, Dec. 31, 1963, as amended by T.D. 66-57, 31 F.R. 4295, Mar. 11, 1966]

§ 2.61 Appendix to certificate of reg istry.

(a) When a vessel of the United States carries passengers to a foreign port or ports the collector of customs will issue to each such vessel admeasured in his district a "Special Appendix to Certificate of Registry of American Passenger Vessels" (Form 1265-A), showing the tonnage of passenger spaces on a deck not a deck to the hull and exempted from inclusion in tonnage by the regulations in this part.

(b) The same requirement applies to vessels operating from his district not previously furnished such an appendix.

(c) At the end of each quarter, the collector must report to this Bureau the official number and name of every vessel in his district to which such appendix has been issued during that period.

§ 2.62 Measurement of Government vessels.

When the tonnage of Government colliers, transports, supply ships, repair ships, etc., is requested this tonnage shall be ascertained in accordance with the rules in this part, but the following requirements will be waived: The marking of the vessel's name and home port, official number (none required), and net tonnage; the requirements as to size and conditions of crew space, and the certifications of deducted spaces on the beam over the doorway. The plate over the door designating its use is sufficient for such certifications.

§ 2.63 Foreign vessels.

A mode of measurement for the tonnage of vessels substantially similar to that of the United States having been adopted by Belgium, Cambodia, Central African Republic, Denmark, Federal Re

public of Germany, Finland, France, Gabon Republic, Great Britain, Greece, Iceland, Israel, Italy, Japan, Liberia, Malagasy Republic, the Netherlands, Norway, Pakistan, Panama, Polish People's Republic, Portugal, Republic of Senegal, Spain, Sweden, Union of Soviet Socialist Republics, Venezuela, and Yugoslavia, and the like courtesy having been extended to vessels of the United States, it is directed that merchant vessels of these countries, the registers of which indicate their gross and net tonnages under their present laws, shall be taken in ports of the United States to be of the tonnages so expressed in their documents. Vessels of foreign countries other than the aforesaid are to be measured according to the laws of the United States.

(R.S. 4154; 46 U.S.C. 81) [28 F.R. 14553, Dec. 31, 1963, as amended by T.D. 66-273, 31 F.R. 15349, Dec. 8, 1966]

§ 2.64 Adjustment and correction of

tonnage.

(a) If there has been a change of structure or use of space that affects tonnage, or, if the owner or his agent claims that either the admeasurement procedure or the officially assigned tonnages are in error, an application for adjustment of tonnage shall be made as provided in § 2.8. The application shall be accompanied by appropriate drawings as outlined in § 2.9 and by a precise statement of the alterations, changes in use of spaces, or assignments of error.

(b) The collector shall not readmeasure unaltered spaces or spaces for which no error is claimed, but shall use the figures shown on the latest record of tonnage admeasurement (Customs Form 1410 or 1410-A), unless there is an obvious error therein. If the vessel was previously admeasured at a port other than the port at which application for adjustment of tonnage is made, the record of tonnage admeasurement or a copy thereof shall be forwarded to the collector at the latter port upon his request.

(c) The collector shall determine the proper tonnage of the vessel. If the tonnage is found to be different from that shown in the vessel's outstanding document, he shall prepare a new record of admeasurement.