Song Yizheng was shocked, and listened to Jiang Huijia again: "If this plaster pen is done, write it on the blackboard, it can be written into words, and if you wipe it again, this handwriting can be erased." www.biquge.info In this way, the blackboard can be reused, which is much more convenient. ”

She casually took a "chalk" with a less strange shape, and scratched it on the red lacquer cabinet next to it, and a white line appeared on the counter. She took a damp cloth next to her and wiped it on the line, which was wiped off.

When Jiang Huijia did this, her brows were still frowning slightly, as if she was very dissatisfied with this effect. But in reality, the effect is already amazing. Even though the plaster pen in her hand is a little weirdly shaped, it does work, and it works well, doesn't it?

Song Yi looked at Jiang Huijia with a deep joy in his eyes.

He is a person who has been reading since he was a child, and he can appreciate the value of this thing better than Jiang Huijia.

At that time, when people were studying, if they were taught in the school, gentlemen were often taught like this.

The gentleman took a book at the top, and the students each took the same book at the bottom. The gentleman reads at the top, and the students read alongside below. Read it and memorize it, and then explain its meaning after memorizing it, in addition to copying, dictating, and so on.

This is both paper-intensive and ink-intensive, because it is not one-on-one teaching, and it is still very difficult to teach a completely illiterate Mongolian child in this way, so the village school only accepts students with a literacy foundation. Song Yi also heard that the town's juku accepts Mongolian children who have no literacy foundation, but the fees for Mongolian children to enter the school are higher.

And if the method Jiang Huijia said can be realized, if there is a gentleman writing large characters on the blackboard, the students can clearly associate the shape and pronunciation of the characters taught by the gentleman at the bottom, so that literacy is not much easier than reciting with the head covered, and there is no need for one-on-one teaching, which can save a lot of time, energy and resources.

The convenience of the blackboard and plaster pen does not stop there, the plaster pen writes, students can see the process of writing clearly, which also helps students to master the structure of the characters and the order of writing strokes. In addition, there are many benefits, Song Yi's brain turns quickly, and he thinks long-term for a while.

Jiang Huijia was still distressed: "It's not very formed, and there is a lot of dust." ”

Song Yi picked up a pen and said, "Is this made of plaster grinding powder?"

Because raw gypsum will dissolve to a certain extent when it encounters water, and it is impossible to condense into lumps, Song Yi directly asked Jiang Huijia if it was made of cooked gypsum.

He knew quite a lot, Jiang Huijia glanced at him, didn't want to be hit by Xueba again, and simply said: "It's made of plaster powder, but maybe only gypsum and water are still insufficient, but I don't know what to add if you want to add anything else." ”

The Westinghouse has been renovated for the past two days, and the walls of the Westinghouse have been repainted with white lime, and now they are waiting for a few more days to dry to get rid of the smell, and at the same time for the low table on the carpenter's side to arrive. Jiang Huijia made chalk in the west room, she used the east room as a kitchen, and the west room as a utility room temporarily. But when it comes to the utility room, there is actually nothing to put in it. She cleaned and cleaned up, and used it to pound the chalk.

In ancient China, gypsum was used for a long time, and lime was also produced in the Eastern Han Dynasty. In addition to the gypsum in the west room, there is also the lime left over from the painted wall, Song Yi pondered: "Why don't you add lime?"

Jiang Huijia said: "How to add? How much to add? Lime is not as good as gypsum, if you inhale too much, it is poisonous." She actually knows that although chalk is easy to make, there is also a recipe. But for a pure layman like her, it would be nice to remember that the teacher said that the main ingredient of chalk was gypsum when she was a student, and she could remember the formula?

No kidding, she hasn't even seen the specific recipe of chalk!

However, even if there is no other recipe, only plaster powder and water can be used to make chalk. It's just that it may be a little rough, and it won't be dust-free.

Jiang Huijia had already decided to use this simple method to make chalk, so she heard Song Yi say: "You have to try it first, different ratios should have different effects." It's not just the addition of lime...... The color is fair, the plaster powder is delicate, in addition to gypsum and lime, there is talcum powder, white clay powder and so on. "The Book of Rites" has clouds, and the knowledge is in the object, and the object is then the knowledge. The change of things is particularly subtle, and the intention of Gewu is to exhaustively investigate its reasoning and explore the changes, which is the meaning of the ancients, and our generation can follow suit. ”

Jiang Huijia: "......" was almost shocked by Song Yi's eloquent talk.

Why does he know so much, who are the ancients?

Is it good to quote scriptures and show learning?

Is this the rhythm that is preparing to develop in the direction of ancient science masters?

However, she had already decided to either do it casually or simply or push the problem to Song Yi. Her eyes fluttered, she snorted lightly, and said with a smile: "I'll find talcum powder, white clay powder and other things, and I'll hand over the chalk to you!"

Song Yi is still inconvenient to move, he will come to the west side room at this time, or because he has to go to the toilet. He walked by the west side house on crutches and went to the thatched house in the backyard, and when he came back, he saw Jiang Huijia still squatting next to a big bucket pondering something, so he came over to ask.

Jiang Huijia cleaned her hands, got up to support him, and said, "But it won't work today, I'll go to the county seat tomorrow to pick up your wheelchair, which will be convenient." ”

She originally told the shopkeeper of the North and South Currency that she would pick up the goods in ten days, and then made a three-day appointment with Dr. Zhang of the Hanging Pot Hall. During this time, he asked someone to diagnose Song Yi, and he pondered and separated the family, and later moved out of the old Song family to this Taolin courtyard, and tossed the Kaimeng Academy, refreshed the wall, and tried to make chalk. There are many things, time is tight, and the agreed time for taking the wheelchair has passed.

Jiang Huijia thought about it at this time, and felt quite embarrassed. I patronized the walls and furniture, and later my thoughts were occupied by chalk, and I forgot about Song Yi's wheelchair. It seems a little too careless.

She helped Song Yi to walk to the bedroom of the East House, and gradually thought in her heart: "Although it is inconvenient for me to directly help him treat his legs, the existence of that Zhang Shengshou is too ethereal, and it is difficult to invite him out of the mountain." But I should be able to find an opportunity to quietly act when Dr. Zhang is treating Song Yi. With Dr. Zhang as a cover-up, even if Song Yi's leg is really good, the world will only think that Dr. Zhang is a good doctor and Song Yi is lucky...... I don't suspect it. ”

As for how they should get along after Song Yi's leg is healed, whether they want to reconcile and separate, Jiang Huijia couldn't think clearly for a while.

She was unconsciously a little dazed, and there seemed to be a vague reluctance somewhere in her heart. But the existence of this emotion was too vague, but it was ignored by her in an instant.

There was a slight change in her expression, Song Yi observed her words, and couldn't help but ask, "Lady?"