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mile. Such light shall be carried as nearly as practicable on the same level as the side lights.
ART. 11. A vessel under one hundred and fifty feet in length when at anchor shall carry forward, where it can best be seen, but at a height not exceeding twenty feet above the hull, a white light, in a lantern so constructed as to show a clear, uniform, and unbroken light visible all around the horizon at a distance of at least one mile.
A vessel of one hundred and fifty feet or upwards in length when at anchor shall carry in the forward part of the vessel, at a height of not less than twenty and not exceeding forty feet above the hull, one such light, and at or near the stern of the vessel, and at such a height that it shall be not less than fifteen feet lower than the forward light, another such light.
The length of a vessel shall be deemed to be the length appearing in her certificate of registry.
A vessel aground in or near a fairway shall carry the above light or lights and the two red lights prescribed by article four
SPECIAL SIGNALS. ART. 12. Every vessel may, if necessary in order to attract attention, in addition to the lights which she is by these rules required to carry, show a flare-up light or use any detonating signal that can not be mistaken for a distress signal.
NAVAL LIGHTS AND RECOGNITION SIGNALS. ART. 13. Nothing in these rules shall interfere with the operation of any special rules made by the Government of any nation with respect to additional station and signal lights for two or more ships of war or for vessels sailing under convoy, or with the exhibition of recognition signals adopted by ship-owners, which have been authorized by their respective Governments, and duly registered and published.
STEAM VESSEL UNDER SAIL BY DAY.
ART. 14. A steam vessel proceeding under sail only, but having her funnel up, shall carry in daytime, forward, where it can best be seen, one black ball or shape two feet in diameter.
III.-SOUND SIGNALS FOR FOG, AND SO FORTH.
ART. 15. All signals prescribed by this article for vessels under way shall be given:
First. By "steam vessels" on the whistle or siren.
Second. By “sailing vessels” and “vessels towed” on the fog horn.
The words "prolonged blast” used in this article shall mean a blast of from four to six seconds duration.
A steam vessel shall be provided with an efficient whistle or siren, sounded by steam or by some substitute for steam, so placed that the sound may not be intercepted by any obstruction, and with an efficient fog horn, to be sounded by mechanical means, and also with an efficient bell. In all cases where the rules require a bell to be used a drum may be substituted on board Turkish vessels, or a gong where such articles are used on board small seagoing vessels. A sailing vessel of twenty tons gross tonnage or upward shall be provided with a similar fog-horn and bell.
In fog, mist, falling snow, or heavy rain storms, whether by day or night, the signals described in this article shall be used as follows, namely:
STEAM VESSEL UNDER WAY.
(a) A steam vessel having way upon her shall sound, at intervals of not more than two minutes, a prolonged blast.
(b) A steam vessel under way, but stopped, and having no way upon her, shall sound, at intervals of not more than two minutes, two prolonged blasts, with an interval of about one second between.
SAIL VESSEL UNDER WAY.
(c) A sailing vessel under way shall sound, at intervals of not more than one minute, when on the starboard tack, one blast; when on the port tack, two blasts in succession, and when with the wind abaft the beam, three blasts in succession.
VESSELS AT ANCHOR OR NOT UNDER WAY.
(d) A vessel when at anchor shall, at intervals of not more than one minute, ring the bell rapidly for about five seconds.
VESSELS TOWING OR TOWED.
(e) A vessel when towing, a vessel employed in laying or in picking up a telegraph cable, and a vessel under way, which is unable to get out of the way of an approaching vessel through being not under command, or unable to maneuver as required by the rules, shall, instead of the signals prescribed in subdivisions (a) and (c) of this article, at intervals of not more than two minutes, sound three blasts in succession, namely: One prolonged blast followed by two short blasts. A vessel towed may give this signal and she shall not give any other.
SMALL SAILING VESSELS AND BOATS.
Sailing vessels and boats of less than twenty tons gross tonnage shall not be obliged to give the above-mentioned signals, but, if they do not, they shall make some other efficient sound signal at intervals of not more than one minute.
SPEED IN FOG.
ART. 16. Every vessel shall in fog, mist, falling snow, or heavy rain storms, go at a moderate speed, having careful regard to the existing circumstances and conditions.
A steam vessel, hearing, apparently forward of her beam, the fog signal of a vessel the position of which is not ascertained shall, so far as the circumstances of the case admit, stop her engines, and then navigate with caution until danger of collision is over.
IV.-STEERING AND SAILING RULES.
Risk of collision can, when circumstances permit, be ascertained by carefully watching the compass bearing of an approaching vessel. If the bearing does not appreciably change, such risk should be deemed to exist.
ART. 17. When two sailing vessels are approaching one another, so as to involve risk of collision, one of them shall keep out of the way of the other, as follows, namely:
(a) A vessel which is running free shall keep out of the way of a vessel which is closehauled.
(b) A vessel which is closehauled on the port tack shall keep out of the way of a vessel which is closehauled on the starboard tack.
(c) When both are running free, with the wind on different sides, the vessel which has the wind on the port side shall keep out of the way of the other.
(d) When both are running free, with the wind on the same side, the vessel which is to the windward shall keep out of the way of the vessel which is to the leeward.
(e) A vessel which has the wind aft shall keep out of the way of the other vessel.
ART. 18. When two steam vessels are meeting end on, or nearly end on, so as to involve risk of collision, each shall alter her course to starboard, so that each may pass on the port side of the other.
This article only applies to cases where vessels are meeting end on, or nearly end on, in such a manner as to involve risk of
collision, and does not apply to two vessels which must, if both keep on their respective courses, pass clear of each other.
The only cases to which it does apply are when each of the two vessels is end on, or nearly end on to the other; in other words, to cases in which, by day, each vessel sees the masts of the other in a line, or nearly in a line, with her own; and by night, to cases in which each vessel is in such a position as to see both the side-lights of the other.
It does not apply by day to cases in which a vessel sees another ahead crossing her own course; or by night, to cases where the red light of one vessel is opposed to the red light of the other, or where the green light of one vessel is opposed to the green light of the other, or where a red light without a green light, or a green light without a red light, is seen ahead, or where both green and red lights are seen anywhere but ahead.
TWO STEAM VESSELS CROSSING.
ART. 19. When two steam vessels are crossing, so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way of the other.
STEAM VESSEL SHALL KEEP OUT OF THE WAY OF SAILING VESSEL.
ABT. 20. When a steam vessel and a sailing vessel are proceeding in such directions as to involve risk of collision, the steam vessel shall keep out of the way of the sailing vessel.
COURSE AND SPEED.
ART. 21. Where, by any of these rules, one of two vessels is to keep out of the way, the other shall keep her course and speed.
Note-When, in consequence of thick weather or other causes, such vessel finds herself so close that collision can not be avoided by the action of the giving-way vessel alone, she also shall take such actions as will best aid to avert collision. [See articles twenty-seven and twenty-nine.]