At the beginning of the 17th century, the British mathematician Napier invented the "Napier counting chip", and the British priest Auchard invented the cylindrical logarithmic slide rule. This kind of slide rule can do addition, subtraction, multiplication and division, multiplication and division, square extraction, and even trigonometric, exponential and logarithmic functions. These inventions have greatly promoted the development of calculators and laid the foundation for the development of modern calculators. In 1642, the great French scientist Pascaline, who was only 19 years old, invented the first mechanical calculator, which had interlocking gears.
The Calculator Writing Tablet in the picture above makes no noise when pressed, and feels soft like a girl`s skin. The tablet comes with a stylus on the back, and it is easy to store. The tablet uses a large flexible LCD screen, which is more high-definition and softer Eye protection, clear the content with one click on the bottom, and you can also lock the key to delete. Calculator With Writing Pad Calculation notes at any time, multiple functions, bid farewell to the trash can full of paper.
Turning one gear through tens will cause the other gear to turn one, but only addition and subtraction can be done. In 1694, Leibniz improved this mechanical calculator to perform multiplication and division calculations in Germany. In the 19th century, Babbage attempted to create a programmable calculator, but the machine was too heavy to operate. Beginning in the 1970s, microprocessor technology was incorporated into calculator manufacturing. The introduction of the microprocessor led to the rapid popularization of electronic calculators.
Development history-④Modern calculator.
Modern calculators, rapid development, and super high computing power have brought us into the Internet age. There are six generations of modern calculators, the first generation of electronic tube computers, the second generation of transistor computers, the third generation of integrated circuit computers, and the fourth generation of computers. Large scale integrated circuit computer, fifth generation intelligent computer, sixth generation biological computer. At present, China and the United States have developed petascale supercomputers.
If you are an office white-collar, sales, accountant, or warehouse manager, getting a Calculator With Notepad is also a very good choice. You can record something at work, and you can even record a phone call temporarily.