3258
THE NEW ZEALAND GAZETTE.
[No. 77

Appliances for Closing Access Openings in Bulkheads at Ends of Detached Superstructures.

Rule XLIII.—Class 1 Closing Appliances.

These appliances are of iron and steel, are in all cases permanently and strongly attached to the bulkhead, are framed, stiffened, and fitted so that the whole structure is of equivalent strength, to the unpierced bulkhead, and are weathertight when closed. The means for securing these appliances are permanently attached to the bulkhead or to the appliances, and the latter are so arranged that they can be closed and secured from both sides of the bulkhead or from the deck above. The sills of the access openings are at least 15 inches above the deck.

Rule XLIV.—Class 2 Closing Appliances.

These appliances are (a) strongly framed hard wood hinged doors, which are not more than 30 inches wide nor less than 2 inches thick; or (b) shifting boards fitted for the full height of the opening in channels riveted to the bulkhead, the shifting boards being at least 2 inches thick where the width of opening is 30 inches or less, and increased in thickness at the rate of 1 inch for each additional 15 inches of width; or (c) portable plates of equal efficiency.

Temporary Appliances for Closing Openings in Superstructure Decks.

Rule XLV.

Temporary closing appliances for middle line openings in the deck of an enclosed superstructure consist of—
(a) A steel coaming not less than 9 inches in height efficiently riveted to the deck;
(b) Hatchway covers as required by Rule X, secured by hemp lashings; and
(c) Hatchway supports as required by Rules XI and XII and Table 1 or 2.

Effective Length of Detached Superstructures.

Rule XLVI.—General.

Where exposed bulkheads at the ends of poops, bridges, and forecastles are not of efficient construction (see Rule XLII) they are considered as non-existent.

Where in the side plating of a superstructure there is an opening not provided with permanent means of closing, the part of the superstructure in way of the opening is regarded as having no effective length.

Where the height of a superstructure is less than the standard its length is reduced in the ratio of the actual to the standard height. Where the height exceeds the standard, no increase is made in the length of the superstructure.

Rule XLVII.—Poop.

Where there is an efficient bulkhead and the access openings are fitted with Class 1 closing appliances, the length to the bulkhead is effective. Where the access openings in an efficient bulkhead are fitted with Class 2 closing appliances and the length to the bulkhead is 0·5 L or less, 100 per cent. of that length is effective; where the length is 0·7 L or more, 90 per cent of that length is effective; where the length is between 0·5 L and 0·7 L, an intermediate percentage of that length is effective; where an allowance is given for an efficient adjacent trunk (see Rule LI), 90 per cent. of the length to the bulkhead is to be taken as effective. 50 per cent. of the length of an open poop or of an open extension beyond an efficient bulkhead is effective.

Rule XLVIII.—Raised Quarter Deck.

Where there is an efficient intact bulkhead, the length to the bulkhead is effective. Where the bulkhead is not intact, the superstructure is considered as a poop of less than standard height.