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. Special lights. ART. 4. (_a_) A vessel which from any accident is not under command shall carry at the same height as a white light mentioned in article two (_a_), where they 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 six feet apart, and of such a character as to be visible all around the horizon at a distance of at least two miles; and shall by day carry in a vertical line one over the other, not less than six feet apart, where they can best be seen, two black balls or shapes, each two 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 two (_a_), and if a steam vessel in lieu of that light three lights in a vertical line one over the other not less than six 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 around the horizon, at a distance of at least two miles. By day she shall carry in a vertical line, one over the other, not less than six feet apart, where they can best be seen, three shapes not less than two feet in diameter, of which the highest and lowest shall be globular in shape and red in color, and the middle one diamond in shape and white. (_c_) 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 them is not under command and can not therefore get out of the way. These signals are not signals of vessels in distress and requiring assistance. Such signals are contained in article thirty-one. Lights for sailing vessels and vessels in tow. ART. 5. A sailing vessel under way and any vessel being towed shall carry the same lights as are prescribed by article two for a steam vessel under way, with the exception of the white lights mentioned therein, which they shall never carry. Lights for small vessels.