How big is Luban?

Luban size: Lu Banchi's standard size is 46 cm, and the allowable deviation is 0.5 cm. The popular Lubanchi is not accurate! -Verification of Lu Half-foot Standard Size (Li Shouli) Confucius said: "If you want to do a good job, you must first sharpen your tools." To learn geography and geomantic omen, you need an accurate compass and Lu Banchi, but the popular Lu Banchi is not accurate. This kind of Lu Banchi was first produced by a company in Shanghai. Later, various manufacturers followed suit, and the format of steel tape measure was wrong. It uses a 42.9 cm Lu Banchi, which is inaccurate, and a 50.4 cm Lu Banchi, which is inaccurate. So what's the standard size of Lu Banchi? First, the classic basis: 1, the Ming Dynasty's "Land-like Architecture Shape" collected by Tianyi Pavilion: "The land-like ruler has a square ruler of one foot, four inches and four minutes. Divided into eight characters, namely wealth, illness, separation, righteousness, official, robbery, harm and happiness. " 2. "Lu Ban Jing" records: "Lu Banchi has a ruler, one foot four inches and four minutes, eight inches between the rulers, and one inch is one inch and eight minutes; There are: wealth, illness, divorce, righteousness, official, robbery, harm and good luck. Mortals build doors to measure them. " 3. Lu Banchi is mainly used to measure the size of doors. As the saying goes, it is better to build a door than to build ten graves. Why are you so cautious about repairing the door? Based on the ancient concept of geomantic omen, the Ten Books of Yangzhai compiled by The Collection of Ancient and Modern Books in Qing Dynasty discussed the miraculous effect of building a portal to communicate with heaven and earth-the so-called "ventilation": The Ten Books of Yangzhai said, "A wife is born on the ground, but her body is empty. It is said that if people swim in the air, they will only live in the house. " This passage embodies an important viewpoint of ancient geomantic theory: regarding the portal as the throat. Under the psychological background of "harmony between man and nature", the magical meanings of kindness, beauty, auspiciousness and violence are conceived by the large and small portals that come in and out. Building and installing doors has become a decisive thing. In the eyes of the ancients, a decent portal can achieve harmony with the "Qi" during human existence by conforming to the nature of heaven and earth and not violating the laws of nature. Otherwise, "Naughty will lead to rage", and you will suffer. The size of the door is related to all this. "Sages make rulers", which is the mysterious "Lu Banchi". "Ten Books of Yangzhai" said: There are several kinds of door rulers in the world, which are tried and tested, but this ruler is true, the length is consistent, and there is no difference between good and bad. Gai Xi lost his class, made good use of holy trees, and learned to be poor, so creation was the ruler. Later people were called "Lubanchi". 4. The Practice of the Ministry of Cleaning Industry lists 124 sizes determined by Lu Banchi, which are divided into 31 gates for Jiafu, 31 gates for Yishun, 33 gates for Lu Guan and 29 gates for Fude. On both sides of Lubanchi, there are Gate Light Star, Nine Good Stars and Autumn Palace Sand. Used to help craftsmen choose the time to build the door. On the back of Lu Banchi is the Ding Lan ruler, which is generally used to measure the circumference of the Yin family, or the size of the tomb, or the length, width, good or bad luck of the tomb. It is divided into ten sections, namely "Ding, Harm, Prosperity, Bitterness, Righteousness, Official, Death, Prosperity, Loss and Wealth". The above is the style of Lu Banchi, and there is also a Lu Banchi, not a Ding Lan ruler, but eight stars, namely the noble star, the natural disaster star and the wealth star. Second, the expert's opinion: 1, according to the cultural relics textbook edited by Luo, Shanghai Ancient Books Publishing House & gt Load: the scale is 32 cm, and it is said that Lu Banchi is a one-foot four-inch wood scale, 45. 12 cm. Clear scale 3 1 cm, transmission one foot four inches, that is, 44.64 cm. It should be correct to estimate about 45 cm, because the error caused by inaccurate measurement in ancient areas is understandable. (In the Qing Dynasty, Beijing was 32 centimeters, so Lu half a foot was 46. The length of the ruler is 1.44. It consists of eight characters: wealth, illness, divorce, righteousness, official, robbery, harm and foundation, and the scale of each word is 0. 18. 3. Lu Banchi in the hands of Mr Zhao Chongmao, the former repair engineer of Beijing Palace Museum. One foot, four inches and four minutes = 460.8 mm (this is half a foot collected by Mr. Li Shouli) Third, scientific basis: cosmic microwave background radiation is the source of life, and cosmic background radiation is isotropic microwave radiation from space background, also known as microwave background radiation. In the early 1960s, American scientists penzias and R.W. Wilson established a highly sensitive horn receiving antenna system to improve satellite communication. 1964, they used it to measure the radio intensity of silver halo gas. In order to reduce noise, they even removed bird droppings from the antenna, but there was still background noise that could not be eliminated. They think that these microwave noises with a wavelength of 7.35cm from the universe are equivalent to 3.5K K. In 1965, they revised it to 3K, and made this discovery public, for which they won the 1978 Nobel Prize in Physics. The most important feature of microwave background radiation is its blackbody radiation spectrum, which can be directly measured on the ground in the band of 0.3 cm -75 cm. In the radio band greater than 100 cm, the ultra-high frequency radiation of the Milky Way itself masks the radiation from the extragalactic space, so it cannot be directly detected. In the wave band less than 0.3 cm, due to the interference of the earth's atmospheric radiation, it can only be detected by space detection means such as balloons, rockets or satellites. It can be seen that we humans are mainly influenced by microwave background radiation of 0.3 cm-75 cm, which should be what the ancients called "vitality". The doors and windows of the house are equivalent to the diameters of diodes and triodes. If the size is wrong, there will be a "standing wave reaction" with poor energy conduction. Then the best primary wavelength should be the golden section value: 0.6 18 * 75 = 46.3 cm. 4. Conclusion: The standard size of Lu Banchi is 46 cm, and the allowable deviation is 0.5 cm. There is a Lu Banchi in the Palace Museum in Beijing, which is 46 cm long, 5.5 cm wide and 1.35 cm thick, which can be verified.