Naozhou Lighthouse is located on Ma'an Mountain at an altitude of 81.6 meters on Naozhou Island. In 1898, the French colonists built this lighthouse, which took two years and two months to complete. It is one of the only two crystal lighthouses in the world at present. London Lighthouse and Cape of Good Hope Lighthouse are one of the three largest lighthouses in the world. The Naozhou Lighthouse is 23 meters high, 5 meters wide at the bottom and 4 meters wide at the top. The whole tower is made of granite. Speaking of "laying", in fact, it is completely stacked one by one without mud, and the stones are very consistent with each other and are integrated into one. The bottom of the tower is a square square pier, the upper part is a cone, and the top is a lamp holder room that protrudes from the tower body. At the bottom of the middle of the tower is a closed rotatable tray with built-in mercury, which supports the entire lamp holder. . The seat frame is composed of more than 160 arc-shaped crystal triangular prism lenses, which form a parabolic reflector body with a focal length of 2 meters. The centers of the circles on both sides of the seat frame are opposite to each other, and a convex lens is installed. A 400 kW fluorescent lamp hangs in the middle of the frame. The seat frame is driven by a motor and rotates at a speed of one revolution every 12 seconds. The powerful beams are refracted at different positions and angles through the crystal prism, and then collected on two convex lenses respectively, and radiated in the horizontal direction, with a range of 26 nautical miles.
她在广州
