In the next two days, Li Feng was still busy. It's not difficult to make chalk, there is plaster and lime, just get it. These things were directly handed over to Rou Niang, and let her play with a few little guys.

With chalk, it still doesn't work, only chalk, no blackboard, and no topping. Speaking of which, the invention of the blackboard is more meaningful than chalk. However, its emergence can be regarded as a major change in the way of teaching. Let the previous boring and inefficient teaching mode that only knows how to shake the head and read has been reborn.

Through the blackboard, it can be more vivid and effective, so that teachers can express their knowledge. Not only can we use words, but also graphics and so on, so that students can learn more easily, understand more easily, and even remember more deeply.

In fact, it is not difficult to make a blackboard, which is to make a large flat wooden board, then evenly brush it with black paint, dry it, and hang it in the center of the classroom.

It's just that in order to make the quality of this blackboard better, bigger and smoother, Li Feng specially called the seventh master, and then slowly pounded it. Of course, there is also time to wait for the black paint to dry inside.

"Come, girl, go get some chalk, let's try"

Looking at the familiar blackboard in front of him, Li Feng couldn't wait to get up in his heart, and hurriedly asked Yaya to get chalk, wanting to try the feeling of these chalk words. I haven't touched either of these things since I finished high school.

"Yaya, take a little more, I will also write with chalk"

"My son also has to write, little aunt, I'll go with you to get it."

"That's it, Sister Yan is the laziest, the eldest brother said that you can do it yourself, you can take it yourself. We won't help you get it, lest you become lazy. ”

After the girl finished speaking, she immediately took the little son and quickly ran into the house to get the chalk.

"Stingy, if you don't help, you won't help, you have the ability, wait for us to compare, whose handwriting is good."

"I'm not afraid of it......"

After a commotion, the three men ran into the house, and then quickly ran out again. Yaya immediately handed Li Feng a few pieces of chalk. However, the three of them didn't move, but looked at Li Feng carefully, wanting to see how to write.

"What should I write, well, there is?"

Holding the chalk and staring at the blackboard, Li Feng was suddenly confused, not knowing what to write. This can be described as a moment that created a historical precedent, and I have to write something a little deeper. However, soon, Li Feng knew in his heart what to write. Pick up the chalk and write a line on the top of the blackboard.

"Yes, yes, ten years of trees, a hundred years of people, a hundred years of education-oriented, well said. Come, Yaya, also give Grandpa Seven a piece of this chalk, and Grandpa Seventh will also come to practice. ”

After seeing the words on Li Feng's blackboard, the seventh master immediately praised and said secretly, this is a good thing. However, soon, he also had a little itchy hands and wanted to try this so-called chalk word.

"Ah...... Why is this chalk so brittle, Yaya, give Seventh Grandpa another one, I don't believe it, and I can't write this chalk word. ”

This chalk word looks very simple, but it is not easy to write. Especially for the ancients like the Seventh Master, who wrote calligraphy all his life. Using this chalk, the difficulty is really not small, no, the word is not half written, so that the seventh master broke a piece of chalk.

The old man was not convinced, and immediately took another piece of chalk to the girl, and then, he broke several pieces of chalk before he could barely write a few crooked words. As soon as he finished writing, the seventh master immediately erased it, there was no way, that word couldn't be seen at all.

"Hey, forget it, it seems that this chalk word is really not easy to write. However, this thing is really good, you see, when you want to write, you can write it, and when you are done, you can just wipe it with your hand, and it is gone, and you can continue to write. Yes...... That's right, Ming boy, we can get a little blackboard like this for everyone and put it on the table in front of us. When you want to write, you write directly with chalk, and when you are done, you can erase it directly. ”

"Haha.......... in this way, there is no need to use paper at all, and even pen and ink are saved. After reading, you don't have to spend money at all, just make more chalk, don't you, don't you say? ”

The Seventh Master originally wanted to avoid the important and trivial, change the topic, and never mention the words he wrote. No way, compared to the words written by Li Feng, what he wrote was too ugly. As he spoke, he came up with a clever trick. Let each student be equipped with a small blackboard. In this way, it really saves pen, ink, paper and inkstone.

This ink paper and the like, in modern terms, what is that, rotten and cheap things. However, in this ancient period, the price of these things was simply outrageously high. A small piece of ordinary rice paper costs a penny, and a hundred pieces are a stone of grain.

For this, Li Feng has a deep understanding, at the beginning, Li Feng was still so expensive that this paper was so expensive, and secretly scolded for a while. If it weren't for the money in the family, according to the speed at which Yaya consumes paper, ordinary people would not be able to bear it at all.

"Haha, Seventh Master, your idea is good, definitely good. In this way, it is really necessary to solve the big problem, and some people will definitely have fun. However, in this way, the desks used by the students must be properly made, otherwise they will not be covered in chalk ash after a class. Also, in this way, it is not good for this body. We have to think about how to design this desk to eliminate these problems. ”

The Seventh Master's idea is wonderful, in this way, the cost of reading is simply reduced to the minimum, and Li Shimin is really happy.

This is also thanks to the Seventh Master, if Li Feng was to himself, he would never have thought of such an idea at all. This is a kind of thinking inertia, after all, in that era, who would worry about a few pieces of paper and a pen. If you have to worry about it, you have to worry about the living expenses you need to go to school, as well as the tuition fees.

"Okay, old man, I'll go and arrange for men to prepare the wood at once. As for how to get this desk, I'll leave it to you. ”

The seventh master is a little impatient now, and he doesn't care whether Li Fengfeng will or not, after throwing Li Feng the task of designing a desk, he trotted away.

After the seventh master left, Yaya, the son, and Gao Yang immediately picked up the chalk and held their writing competition on the blackboard. In fact, whether it is Yaya, or the son-in-law and Gao Yang, they have never worried about this pen and paper, and they don't know what these things mean to ordinary people.

However, Li Feng is not so easy, this work of designing the desk, the seventh master has handed it over to him. This is a very urgent and big matter, and it is not to be careless. Perhaps, the seventh master, they don't care at all, whether this desk is suitable or not, and they don't care, whether it will stain their clothes, whether it will make chalk ashes fly and so on.

However, Li Feng knew that this matter could not be sloppy. Especially the latter shortcoming, we must find a way to solve it.

"Well, first of all, there must be a special slot for chalk ash on this desk, and secondly, a good blackboard eraser. There are some things that must be kept after being written, which cannot be written on a small blackboard. In this case, you have to use pen and paper, so you have to prepare another clean plank......"

As Li Feng considered all kinds of factors, the ideas in his mind became clearer and clearer.