Before using Lu Banchi, the measured object and measuring position must be determined, and the sundries on the surface of the measured object must be removed. Place the Lu Banchi flat on the measured object, and adjust the position of Lu Banchi to make it contact with the measured object and keep it horizontal. Read the scale value on the Luban pool in contact with the measured object, and pay attention to the corresponding decimal places.
Record the measured values and process the significant figures. Lu Banchi needs cleaning and maintenance after use to ensure the accuracy and precision of the next use. In a word, the correct use of Lu Banchi needs to pay attention to the steps of selecting the appropriate Lu Banchi, determining the measurement object, placing the Lu Banchi, reading the measurement value, recording the measurement value, cleaning the Lu Banchi and so on, so as to ensure the accuracy and precision of the measurement results.
Important tool
Lu Banchi, also known as "Lu Banchi" and "Lu Banchi", is a measuring tool used in building houses, similar to the ruler used by craftsmen today. Lu Banchi, about 46.08 cm long, is said to have been written by Lu Ban, the Duke of Lu in the Spring and Autumn Period, and was later added into the eight characters by the geomantic circle. It is used to measure the good or bad of a house, and it is also called "door meter" or "square" woodworking tool, which is mainly used to check whether the planed plates, purlins and structures are vertical and whether the edges are at right angles.
1 city ruler =0.8 Lu Banchi, Lu Banchi was merged with Ding Lan ruler soon after it was produced, and then inches and centimeters were used. It is an important tool for measurement and calibration. Because of its special function, it is most widely displayed in geomantic culture and architectural culture. Lu Ban has many inventions, and many ancient books record that he invented many woodworking instruments for carpenters. Like a carpenter's ruler, it's called Lu Banchi. Another example is Mo Dou, umbrella, saw, planer and drill. Legends are all invented by Lu Ban.