The companion was still suspicious, but since he didn't look particularly happy, he didn't care and didn't ask any further questions.
When many people in Wan Chao heard Zhou Jia's words, a glimmer of hope flashed in their eyes. Is it really possible for ordinary people like them to leave their names in history?
"Throughout history, people have used a variety of materials for printing, including iron plates, pottery, clay, wood, and tin.
The advent of printing can be said to have laid a solid foundation for the dissemination of knowledge. Without it, knowledge might not have been disseminated smoothly until today. We will discuss the deeds of Cai Lun and Bi Sheng in detail later. Now let's talk about the compass. After that, let's talk about the heavyweight gunpowder.
Ying Zheng and others became more serious. What they wanted to know most was this so-called gunpowder.
"The purpose of a compass is to indicate direction. If you are in a dense forest or at sea, where the scenery is the same everywhere, it would be difficult to determine your direction. But a compass can solve this problem very well.
The compass was originally called Sinan. The term Sinan began in the Warring States Period and ended in the Tang Dynasty. It looked like a base like the one in the picture, with the magnetic spoon placed on it.
As time went on, it gradually developed into the magnetic needle, which was also used for geomancy and navigation. To make it easier to use and read, someone combined the magnetic needle with a graduated disk to form a new pointing instrument - the compass, which basically looks like this.
Zhou Jia found a picture of a compass, opened the compass on her phone and shook it to show them.
"See? When I shake it, the needle deflects. The one next to it shows the exact angle, which makes it easier for us to determine our position. As for why it deflects, I'll explain it in detail later. Today, we'll just focus on the development and use of the compass."
Ying Zheng looked at the compass in Zhou Jia's hand. He first exclaimed that this mobile phone was really convenient, and then wondered how the function of the compass would be realized on mobile phones in the future.
"The compass is not only widely used here, but it is also said that foreigners have discovered many valuable things at sea using it.
There are many historical records about the compass, so I won't go into detail here. Now let's talk about gunpowder. Before we begin, let me show you a video that you will really like.
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