SHIPS' LIGHTS  AND   REGULATIONS	Jgg
above the hull of not less than 20 feet, and if the breadth
of the vessel exceeds 20 feet, then at a height above the
hull not less than such breadth, so, however, that the
light need not be carried at a greater height above the
hull than 40 feet, a bbight white light so constructed
as to show an unbroken light over an arc of the horizon
of 20 points of the compass, so fixed as to throw the light
10 points on each side of the vessel, viz., from right ahead
to 2 points abaft the beam on either side, and of such a
character as to be visible at a distance of at least 5 miles.
 (b)	On the starboard side a green light so  constructed
as to show an unbroken light over an arc of the horizon
of 10 points of the compass, so fixed as to throw the light
from right ahead to 2 points abaft the beam on the star-
board side, and of such a character as to be visible at a
distance of at least 2 miles.
 (c)	On the port side a bed light, so constructed as to show
an unbroken light over an arc of the horizon of 10 points
of the compass, so fixed as to throw the light from right
ahead to 2 points abaft the beam on the port side, and of
such a character as to be visible at a distance of at least
2 miles.
 (d)	The said green and red side-lights shall be fitted with
inboabd scbeens projecting at least 3 feet forward from
the light, so as to prevent these lights from being seen
across the bow.
 (e)	A steam vessel when under way may carry an additional
\vhite light similar in construction to the light men-
tioned in sub-division (a).    These two lights shall be so
placed in line with the keel that one shall be at least
15 feet higher than the other, and in such a position with
reference to each other that the lower light shall be forward
of the upper one.    The vertical distance between these
lights shall be less than the horizontal distance,
Steam Vessels When Towing.
abt. 3.—A steam vessel when towing another vessel shall, in
addition to her side-lights, c&rry two bright wumfi lights in a
vertical line one over the other, not less than 6 feet apart, and