The correct usage of the Dinglan ruler is explained in detail below:
To measure right angles: Open the two copper legs of the Dinglan ruler so that they form a right angle, and align one of the legs with a straight line, then use the other leg to draw a right-angled line perpendicular to it. This is one of the most commonly used functions of Ding Lan ruler.
Measuring horizontal and vertical lines: One leg of the Dinglan ruler is rotatable and has a horizontal bubble between the two copper legs. Place the Dinglan ruler on the surface to be measured and adjust the position of the rotating legs and copper legs until the horizontal bubble is in the center. This way, you can get an accurate horizontal or vertical line.
Measuring angles: The rotating legs of the Dinglan ruler can be used to measure angles. Adjust the rotating leg to the desired angle, then place the Dinglan ruler on the surface to be measured, determine the right-angle position, and draw a straight line.
Other functions: Ding Lan ruler can be used to cut materials, measure the size of irregular shapes, etc. You can measure length with its folding ruler and use the swivel legs for measuring and marking.
Dinglan ruler is a kind of Feng Shui tool. Measuring the size of the Yin House, it is one foot, two inches long and eight points long. One foot is about 38.78 centimeters, divided into ten grids. On it are engraved "wealth, loss, prosperity, death, official, righteousness, suffering, prosperity, harm, and Ding". "Cross, it is better to use the word "auspicious" when using it.
It is also an auspicious tool used by carpenters in some areas. Ding Lan was a filial son in the Han Dynasty. According to legend, his mother died when he was young. When he grew up, he carved a wooden statue as if it were alive.
Cao Zhi's "Lingzhi Pian" said: "Ding Lan lost his mother Ye Zheng when he was young. He injured himself early and was left alone. He carved the wood to be strict with his relatives, causing three sacrifices day and night." The so-called "Ding Lan Ruler", that is, It was a special ruler used to make shrines, carve wooden statues, and make tablets for gods. It was later also used in a large number of architectural scales.
This kind of ruler is divided into "Ding", "Harm", "Prosperity", "Bitterness", "Yi", "Official", "Xing", "Loss", "Death", " "Wealth", "Liangyi" and other large grids, each large grid has several small grids. For example: under "Death" there are four grids: "Loss of wealth", "Retired son", "Farewell" and "Leaving hometown". There are four grids under "Cai": "Treasure House", "Liuhe" and "Jinlu".
In the architectural scale, we should avoid the "death", "suffering", "lost" and "harm" grids, and use the "ding", "wang", "yijueying" and "official" , "Xing", "Wealth" and other patterns, to seek good luck and avoid bad luck.