18& NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
when towing more than one vessel shall carry AN ADDITIONAL
HEIGHT WHITE LIGHT 6 feet above or below such lights, if the length
of the tow, measuring from the stern of the towing vessel to the
stern of the last vessel towed, exceeds 600 feet. Each of these
lights shall be of the same construction and character and shall be
carried in the same position as the white light mentioned in Article 2
(a), except the additional light, which may be carried at a height
of not less than 14 feet above the hull.
Such steam vessel may carry A SMALL WHITE LIGHT abaft the
funnel or aftermast for the vessel towed to steer by, but such light
shall not be visible forward of the beam.
Vessels not under Command and Cable Ships.
AST. 4.—(a) A VESSEL which from any accident is NOT UNDER
COMMAND shall carry at the same height as the white light men-
tioned in Article 2 (a), where tjiey can best be seen, and, if a steam
vessel, in lieu of that light, TWO RED LIGHTS, in a vertical line one
over the other, not less than 6 feet apart, and of such a character as
to be visible all round the horizon at a distance of at least 2 miles ;
and shall BY DAY carry in a vertical line one over the othet. not less
than 6 feet apart, where they can best be seen, TWO BLACK BAULS OB
SHAPES, each 2 feet in diameter.
(b) A vessel employed in laying or in picking up a telegraph
cable shall carry in the same position as the white light mentioned
in Article 2 (a), and, if a steam vessel, in lieu of that light, THREE
LIGHTS in a vertical line one over the other, not less than 6 feet
apart. The highest and lowest of these lights shall be red, and
the middle light shall be white, and they shall be of such a character
as to be visible all round the horizon, at a distance of at least 2
miles. BY DAY she shall carry in a vertical line one over the other,
not less than 6 feet apart, where they can best be seen, THREE SHAPES
not less than 2 feet in diameter, of which the HIGHEST AND LOWEST
shall be GLOBULAR in shape and RED in colour, and the MIDDLE ONE
DIAMOND in shape and WHJLTK.
(o) The vessels referred to in this Article, when not making
way through the water, shall not carry the side-lights, but when
making way shall carry them.
(d) The lights and shapes required to be shown by this Article
are to be taken by other vessels as signals that the vessel showing