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LIGHTS AND SIGNALS  35

two red lights placed vertically one below the other, 13 feet apart, the top light being 26 feet below the control car, and both visible, so far as practicable in all directions, at a distance of not less than two and one-half miles. 

In addition, it shall, if making way, but not otherwise, display the side lights described in sub-paragraphs (b) and (c) of paragraph 8 above. 

By day, it shall display two black balls or shapes, each at least 24 inches in diameter, placed vertically one below the other 13 feet apart, the upper one being 26 feet below the control car, and both visible so far as practicable in all directions. Where necessary, it comply with these conditions, these signals may be duplicated. 

10. (a) 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; 

(b) Every airship moored to the ground or the surface of the water by a cable shall display forward the white light described in sub-paragraph (a) of paragraph 8 of this Part and at the rear the white light described in sub-paragraph (d) of paragraph 8 of this Part. In addition, the airship and the mooring cable shall be lighted or marked in accordance with the requirements of paragraph 7 of this Part for a captive balloon. 

(c) An airship while picking up its mooring, although considered as being under way and not being under control, shall, however, display only the lights prescribed in paragraph 8 of this Part, until it is finally made fast. 

SECTION II

GROUND MARKINGS AND SIGNALLING

A. General

11. The meanings given to the various markings, lights and signals in this Section are reserved to them exclusively. 

The location of the ground signals and signal areas provided for in Part B of this Section, at aerodromes open to public use, should as far as possible be indicated in notices to airmen and in plans of aerodromes which are published.