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LIGHTS AND SIGNALS  33

an aerodrome or from a recognized air route, shall display a white light placed twelve feet vertically above a red light, these lights to be visible, so far as practicable in all directions, at a distance of at least two and one-half miles. The white light shall be placed at least 16 feet and at most 32 feet below the basket or, if there is no basket, below the lowest part of the balloon or kite. From the mooring cable shall be displayed, at intervals of 1,000 feet measured from the group of two lights prescribed in this sub-paragraph, similar groups of two lights, white and red. If the lowest group of lights is obscured by clouds, one additional group shall be displayed below the cloud base; 

In addition, the position of the object to which the balloon or kite is moored on the ground shall be marked by a group of three flashing lights arranged on a horizontal plane at the apexes of a triangle approximately equilateral and measuring at least 82 feet on each side; the side of this triangle, perpendicular to the horizontal projection of the cable, shall be delimited by two red lights; the third light shall be a green light placed opposite the direction of the cable; 

(b) By day the mooring cable of a captive balloon shall have attached to it, at intervals of not more than 650 feet measured from the basket or, if there is no basket, from the lowest part of the balloon, tubular streamers not less than 16 inches in diameter and 7 feet long, and marked with alternate bands of white and red, 20 inches in width; 

(c) By day the mooring cable of a kite shall be marked in a manner prescribed in sub-paragraph (b) above for a captive balloon, or else by streamers of stout paper at intervals of 300 feet measured from the lowest part of the kite. Such streamers, which shall be at least 31 inches long and at least 12 inches wide in their widest part shall be marked with alternate bands of white and red, 4 inches in width; 

(d) By way of exception to the rules of this paragraph, captive balloons and kites used for meteorological observations, which, owing to their insufficient static lift, cannot display the lights and signals prescribed 

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