Gold-plated copper disk hand computer

[Gold-plated copper disk handheld computer]

Gold-plated copper disk handheld computer was 55.5cm long, 12cm wide and 4.8cm high in the Kangxi period of the Qing Dynasty. The old collection of the Qing Palace
This disk-type hand-operated computer is made of brass and plated with gold on the surface. It is installed in a special black lacquer wooden box. It is made by the Qing Palace Building Office according to the construction principle of the Basigar computer. The addition, subtraction, multiplication and division can be performed by using the rotation of its gear system. There are 10 disks of equal size on the computer surface, representing ten digits. Each disk is divided into the upper disk and the lower disk. The center of the upper disk is engraved with the digital name of Latin pinyin, and the Arabic numerals from 1 to 9 are engraved around it in a counterclockwise direction. There is a space between 1 and 9. In the space, install a copper block that can move up and down. Move the block, and you can see a number of the two divisions of the lower disk
The lower disc is also divided into 10 cells, and the inner and outer circles are also divided into 3 circles. The outer circle is evenly distributed with 10 small holes. Insert a pin into the small round hole, and you can turn the lower disc clockwise. Install a 10-tooth gear under each of the 10 discs of the lower plate, and the gear will also rotate when the lower plate rotates. When the reading of the space on the upper plate exceeds 9, if you continue to turn the plate, the gear can drive the left gear to turn one grid, which will increase or decrease the reading on the left by 1. Specifically, turn the footplate clockwise and read the number in the circle to reflect the carry, which is applicable to addition and multiplication; Reading the numbers in the inner circle can reflect the abdication, which is applicable to subtraction and division
In the small drawer of the black lacquered wooden box of this computer is a pair of Chinese-style Nabil. The disk computer can carry out addition, subtraction, multiplication and division operations. For example, it can also carry out square, cubic, square root, square root and other operations in combination with arithmetic chips
The French scientist Basigar invented the world’s first disk handheld computer in Paris in 1642. Later, the missionaries introduced the disk handheld computer to Emperor Kangxi, who loved natural science.