ART. 5.  A sailing vessel under way and any vessel being towed shall carry the same lights as are prescribed by article 2 for a steam vessel under way, with the exception of the white lights mentioned therein, which they shall never carry.

ART. 6.  Whenever, as in the case of small vessels under way during bad weather, the green and red side lights can not be fixed, these lights shall be kept at hand, lighted and ready for use, and shall on the approach of or to other vessels be exhibited on their respective sides, in sufficient time to prevent collision, in such manner as to make them most visible and so that the green light shall not be seen on the port side nor the red light on the starboard side, nor, if practicable, more than 2 points abaft the beam on their respective sides.

To make the use of these portable lights more certain and easy the lanterns containing them shall each be painted outside with the color of the light they respectively contain and shall be provided with proper screens.

ART. 7.  Steam vessels of less than 40 and vessels under oars or sails of less than 20 tons gross tonnage, respectively, when under way shall not be obliged to carry the lights mentioned in article 2 (a), (b), and (c), but if they do not carry them they shall be provided with the following lights: 

  First.  Steam vessels of less than 40 tons shall carry—­

(a) In the fore part of the vessel or on or in front of the funnel, where it can best be seen, and at a height above the gunwale of not less than 9 feet, a bright white light constructed and fixed as prescribed in article 2 (a) and of such a character as to be visible at a distance of at least 2 miles.

(b) Green and red side lights constructed and fixed as prescribed in article 2 (b) and (c) and of such a character as to be visible at a distance of at least 1 mile, or a combined lantern showing a green light and a red light from right ahead to 2 points abaft the beam on their respective sides.  Such lanterns shall be carried not less than 3 feet below the white light.

Second.  Small steamboats, such as are carried by seagoing vessels, may carry the white light at a less height than 9 feet above the gunwale, but it shall be carried above the combined lantern mentioned in subdivision 1 (b).

Third.  Vessels under oars or sails of less than 20 tons shall have ready at hand a lantern with a green glass on one side and a red glass on the other, which on the approach of or to other vessels shall be exhibited, in sufficient time to prevent collision, so that the green light shall not be seen on the port side nor the red light on the starboard side.

  The vessels referred to in this article shall not be obliged to carry
  the lights prescribed by article 4 (a) and article 11, last
  paragraph.