183 NICHOLAS'S SEAMANSHIP AND NAHTICAL KNOWLEDGES prescribed iii Article 2(6) and (c) and of such a character , as to be visible at a distance of at least J mile, or a COMBINED LANTERN showing a green light and a red light from right ahead to 2 points abaft the beam on then- respective sides. Such lantern shall be carried not less than 3 feet below the white light. 2. Small steamboats, such as are carried by sea-going 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 sub-division 1 (6). 3. 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. 4. Rowing boats, whether under oars or sail, shall have ready at hand a LANTERN SHOWING A WHITE LIGHT, which shall be temporarily exhibited in sufficient time to prevent collision. 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. Pilot Vessels. ART. 8.—Pilot vessels, when engaged on their station on pilotage duty, shall not show the lights required for other vessels, but shall carry A WHITE LIGHT AT THE MASTHEAD, visible all round the horizon, and shall also exhibit a PLABE-TJP LIGHT or flare-up lights at short intervals, which shall never exceed fifteen minutes. On the near approach of or to other vessels they shall have their side-lights lighted, ready for use, and shall FLASH or* SHOW them at short intervals, to indicate the direction in which they are heading, but the green light shall not be shown on the port sid& nor the red light on the starboard side. A pilot vessel of such a class as to be obliged to go alongside of a vessel to put a pilot on board may show the white light instead of carrying it at the masthead, and may, instead of the coloured