1. Stories of Modern Ways of Delivering Information
Lighthouses
Lighthouses originated as signaling beacons in Ancient Egypt. The world's earliest lighthouse was built in the 7th century B.C. on Cape Baba in the Darnell Channel and stood like a huge bell tower. At that time people burned firewood in the lighthouse and used its firelight to guide their course.
In 280 BC, the ancient Egyptians built a lighthouse on the island of Pharos opposite the Egyptian city of Alexandria by order of King Tolomei II Philadelph, 85 meters high, burning wood day and night, using the flame and column of smoke as a sign to aid navigation.
Faros lighthouse is known as one of the seven wonders of the ancient world, destroyed by an earthquake in 1302. 9 century, France in the Gironde estuary surgical Doon Reef to build a lighthouse, has been rebuilt twice, the existing built in 1611.
Among the old lighthouses, Italy's Leghorn Lighthouse is still in use today. This lighthouse was built in 1304 in stone and is 50 meters high. The first lighthouse in the United States was the Boston Lighthouse built in 1716.
Since then, the lens lighthouse was built in 1823, the electric lighthouse was built in 1858, the caisson method was first used to build a lighthouse on a soft foundation in 1885, and the first gas flashing tower was completed in 1906. 1850, there were only 1,570 lighthouses around the world, and 9,400 were added in 1900. By early 1984, the total number of lighthouses, including other lighted beacons, had exceeded 55,000.
2, the ancient story of information transmission
Hong Yan passes the book
"Hong Yan passes the book" allusion, from the "Han book? The story of "Su Wu Shepherds the Sheep" in the "Biography of Su Wu".
According to the story, in the first year of Emperor Wu's reign (100 B.C.), Su Wu was detained by Di Hou Shan Yu on a mission to Xiong Nu, and his bravery led to his exile to the North Sea (present-day Lake Baikal) to herd sheep in no-man's-land. 19 years later, Emperor Zhao succeeded to the throne of the Han Dynasty, and the Han and the Murderers reconciled and became relatives by marriage.
An envoy from the Han Dynasty came to the murderer and demanded that Su Wu be released, but Shan Yu refused to do so, but could not tell him, so he falsely claimed that Su Wu had died.
Later, Emperor Zhao of Han Dynasty sent another envoy to Xiong Nu, and Chang Hui, the deputy envoy who went on a mission to Xiong Nu with Su Wu and was detained, through the help of the forbidden pawns, met with the envoy of Han Dynasty secretly one night, told the envoy of Han Dynasty about the situation of Su Wu, and came up with a plan for Han Dynasty envoys to speak to Shan Yu, saying, "When the Emperor of Han Dynasty hunted in the Shanglin Garden, he shot a goose, and on its foot, tied with a letter written on silk, it says that Su Wu is not dead, so the envoy of Han Dynasty has not been able to tell him. letter which said that Su Wu was not dead, but in a great swamp."
The Han envoy was very glad to hear this, and rebuked Shan Yu according to Chang Hui's words. Shan Yu was amazed to hear this, but he could not deny it, so he had to release Su Wu back.
Expanded:
1, the tower
Lighthouse by the lamps and lanterns and tower body composition. The tower can be constructed from a variety of building materials, mainly to adapt to and resist the wind and waves and other harsh natural conditions, in order to maintain their stability and durability. Tower height to adapt to the light range requirements.
Lamps are composed of luminous and light emitters and light emitters two basic parts. Modern lighthouse light-emitting energy is mainly used in electric power, the luminous body of the luminous emitter.
Center is located in the focal point of the condenser lens, the light source radiates a spherical light through the condenser lens into a certain diffusion angle of the parallel beam. The range of the lighthouse can be up to about 30 nautical miles, and the intensity of the light can reach hundreds of millions of candles. The light has flash, fixed light and light and dark light. The light colors are red, white or green and white. Red and green light is usually used to indicate that there is an obstacle in the light arc.
Previous lighthouses symbolized hope because they were lit by fire.
2, the geese pass the letter
Legend has it that when Han Gaozu Liu Bang was besieged by the king of Chu, Xiang Yu, it was the pigeons that passed the letter, drawing reinforcements to get out of danger. When Zhang Qian and Ban Chao traveled to the West, they also used pigeons to transmit messages with the royal family.
Qing dynasty Qianlong years, China's guangdong foshan area every year in May, June pigeon will be held, every year there are a few thousand to participate in, the race distance of about 400 miles. At that time in Shanghai, Beijing and other places, there are similar pigeon racing. The earliest written record of the use of pigeons to transmit news abroad was found in 530 BC, when pigeons were used to transmit the results of the Olympic Games.
The goose is the name of the letter, sometimes also referred to as the letter carrier. Why "wild geese" as a substitute for letters and letter carriers? The origin is that during the Han Dynasty, Su Wu went on a mission to Xiong Nu and was exiled by Shan Yu to herd sheep in the North Sea.
Ten years later, the Han Dynasty made peace with Xiong Nu, but Shan Yu still would not let Su Wu return to Han. Chang Hui, who traveled with Su Wu to the Xiong Nu, informed the Han envoy of Su Wu's situation and devised a plan for the envoy to tell Shan Yu that the Emperor of the Han Dynasty had shot a wild goose during a hunting trip, and there was a letter tied to the foot of the wild goose, which told him that Su Wu had been herding sheep in a certain swampy area. After hearing this, Shan Yu had no choice but to let Su Wu return to Han. Later, people used the geese as a metaphor for the letters and the people who delivered them.