THE HONG KONG GOVERNMENT GAZETTE,MAR CH 3, 1933.
Airships.
11. (1) Except as provided in the next following paragraph an airship when under way shall display the, following lights :-
(a) forward, a white light fixed so as to show forward an unbroken light visible at a distance of at least 5 miles in a dihedral angle of 220° formed by two vertical planes and bisected by the plane of symmetry;
(b) on the right side, a green light fixed so as to show an unbroken light visible at a distance of at least 5 miles in a dihedral angle of 110° formed by two vertical planes, of which one is parallel to the plane of symmetry and directed dead ahead, and the other is directed to the right;
(c) on the left side, a red light fixed so as to show an unbroken light visible at a distance of at least 5 miles in a dihedral angle of 110° formed by two vertical planes, of which one is parallel to the plane of symmetry and directed dead ahead, and the other is directed to the left;
(d) at the rear, a white light fixed so as to show astern an unbroken light visible at a distance of at least 3 miles in a dihedral angle of 140° formed by two vertical planes and bisected by the plane of symmetry.
(2) In a case where, in order to comply with the foregoing provisions of this paragraph, a single light has to be replaced by several lights, the field of visibility of each of those lights shall be so limited that only one can be seen at a time.
12.-(1) An airship which is under way and which is not under control. or which has voluntarily stopped its engines, or which is being towed, shall display the following lights :---
(a) the forward and rear lights required by sub- paragraphs (1) (a) and (1) (d) of the last foregoing paragraph;
(b) in addition, below the airship, two red lights, one placed vertically below the other 12 feet apart, the upper light being 25 feet below the control car, and both being visible so far as practicable in all directions at a distance of not less than two miles;
(c) in addition, if making way but not otherwise, the side lights required by sub-paragraphs (1) (b) and (1) (c) of the last foregoing paragraph
(2) By day, an airship in the circumstances mentioned in sub-paragraph (1) of this paragraph shall display two black balls or shapes, each at least 2 feet in diameter, one placed vertically below the other 12 feet apart, and both being visible so far as practicable in all directions.
Where necessary in order to comply with the foregoing provisions of this sub-paragraph, the said group of two black balls or shapes may be duplicated.
13.-(1) An airship when moored to a mooring mast shall display at or near the rear a white light visible, so far as practicable, in all directions at a distance of at least 3 miles.
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