I am a light, to warn and guide the mariner, and to render visible certain marks and

I am a light, to warn and guide the mariner, and to render visible certain marks and beacons, which serve to point out the way of safety to vessels, which would otherwise remain in perpetual danger. I am placed, as a warning light, at the entrance of harbours, and at sea marks, and other places, where vessels are to be directed. I am a light, which shows a red light, to warn of danger, and a white light, to indicate