FRANCE.

!

ENGLAND.

GERMANY.

SPACES USED IN NAVIGATION.

In the three countries the spaces deducted for navigation are:

1. Wheelhouse.

2. Lookout house.

3. Signal house.

4. Towers for running lights.

In Hamburg, towers for running lights are sometimes exempted instead of being deducted. In Hamburg, the lamp locker, if reserved for running lights only, is also deducted, it being considered a signal house.

5. Room for charts and navigation instruments (chart room). When the captain is quartered in this room, 3 tons only are deducted on account of the charts. This should not be confused with the supplementary deduction of 3 tons, allowed by the national rules, when the charts are kept in a space that is not deducted.

6. Capstan or windlass space, when it is on the upper deck. In the very rare case when the capstan or windlass is situated in a space not exclusively reserved for it deduction would in France be made only of the space occupied by the apparatus and necessary for its operation. (See ABCD, fig. 11.)

7. Steam steering-gear space (same remarks as for the capstan).

8. Auxiliary-boiler space, when this boiler is situated in an inclosed space on the upper deck and is used only to operate the capstan, windlass, or the steering gear.

NOTE. In practice the auxiliary boiler is almost always used in the operation of the derricks for handling merchandise and therefore is almost never deducted except on war vessels.

B. DEDUCTIONS FOR PROPELLING MACHINERY.

On vessels with coal bunkers with movable partitions, deduction is made according to the Danubian rule (i. e., 1.75 or 1.50 the actual machinery volume).

On vessels with fixed coal bunkers, the actual volume of the machinery and bunkers is deducted, if the owner so desires.

PRINCIPAL VOLUME.

The measurements are made in the same way as for the national tonnage. The Suez tonnage is thus indirectly benefited by the restrictions imposed on the dimensions by the rules of the different countries.

SPACES TO BE INCLUDED.

The spaces occupied by dynamos, distilling apparatus, refrigerating apparatus, machine shops, etc., are treated in the three countries as in the national tonnage rules.

VENTILATION SPACES.

In case the actual volume of the machinery and bunkers is deducted the engine-room ventilators in the 'tween decks and in inclosed superstructures are deducted at their actual value. The surplus is exempted. Nevertheless, in Germany all these spaces are, sometimes,

measured (for the gross tonnage) and then deducted instead of being exempted. As a matter of fact there is no difference. In the case of deduction according to the Danubian rule, all engine-room ventilators situated in a 'tween decks space are considered as part of the machinery space and have a right to the increment. Shelter-deck spaces and spaces under a bridge considered as closed under the national rules are, in this respect, considered as 'tween decks.

In England, in addition, and wrongly, there is included in the volume of the machinery, with right to the increment, such part of the ventilators as lie outside of the 'tween decks and are inclosed on at least three sides. in inclosed constructions.1

In a space under a bridge considered inclosed, in the national rules, the ventilators receive the same treatment as in 'tween decks.

In a space under a bridge considered open, in the Suez rules, the ventilators are simply, and rightly, entitled to exemption.

In a space under a bridge considered open under national rules, and not open under the Suez rules, the 1904 rules exempt the engine-room ventilators and also the space appertaining thereto.

In England, the exemption of engine-room ventilators at any stage entails their exemption at all stages above.

A deck space above another deck space is never treated as a 'tween-deck space.

VOLUME OF THE SHAFT TUNNEL.

In Germany, there is a tendency to consider an open space under a bridge as a 'tween deck space, and therefore to apply the Danubian increment to the ventilators therein.

In the three countries, it is treated as in the national rules. (See Appendix 8.)

1 See note 2, p. 439, for present application in England.

APPENDIX XVII.

INSTRUCTIONS AND REGULATIONS RELATING TO THE MEASUREMENT OF SHIPS OF THE UNITED

STATES NAVY FOR TONNAGE CERTIFICATES

USED IN NAVIGATION OF THE SUEZ

MARITIME CANAL.

APPENDIX XVII.

INSTRUCTIONS AND REGULATIONS RELATING TO THE MEASUREMENT OF SHIPS OF THE UNITED STATES NAVY FOR TONNAGE CERTIFICATES USED IN NAVIGATION OF THE SUEZ MARITIME CANAL.

[Compiled and prepared by the scientific and computing branch of the Bureau of Construction and Repair, Department of the Navy, 1909.]

For reference in connection with the question of tonnage, see:

(a) United States Statutes at Large, Revised Statutes United States, Nos. 4150 to 4154, pages 803 to 806.

(b) Supplement, Revised Statutes, United States, volume 1, act of August 5, 1882, page 378, chapter 398, act of June 19, 1886, page 494, chapter 421, section 5.

(c) Supplement, Revised Statutes, United States, volume 2, act of March 2, 1895, page 407, chapter 173.

(d) United States Statutes at Large, volume 35, part 1, Public Laws, act of February 6, 1909, page 613, chapter 82, section 1.

(e) Customs Regulations, 1908. (Treasury Department.)

(f) Navigation Laws, United States, 1907 (corrected). (Department of Commerce and Labor.)

(g) Instructions relating to the measurement of ships, 1907 (English).

(h) Regulations for the Navigation of the Suez Maritime Canal, 1907.

(i) Translation (Naval Intelligence). Instructions for the measurement of ships (German).

(j) Responses aux Questions de Tonnage concernant les Navires de Guerre. (C. & R. No. 6215A21 to 25.)

(k) Letter, Bureau of Navigation, Department of Commerce & Labor. (C. & R. No. 6563A7 and 8.)

(1) Letter No. 6215A19 and 20 in re rulings of the Suez Co.

(m) Report on certificate, U. S. S. New York (6215A8).

(n) Copy of Suez certificate for the U. S. S. Abarenda (25945E3).

NOTE. Inasmuch as most of the above references are corrected and reissued at certain times, and as it is most desirable that the latest issues be had, it will be the duty of those computing tonnage in the scientific and computing branch of the Bureau of Construction and Repair, to secure, from time to time, through the proper channels, such reissues and also such new references as may be found to have a bearing on the question of tonnage.

GENERAL INSTRUCTIONS.

1. Uniformity in measurements.—These instructions are compiled for use in the preparation of tonnage certificates, upon which tonnage tolls may be collected, when ships of the United States Navy have occasion to pass through the Suez Maritime Canal, and it is of great importance not only that the following laws and regulations be followed, but that all the required measurements be taken, and calculations made, in one uniform and correct manner, so that one general system may prevail throughout.