In fact, Zhao Hao is not too worried about leaking secrets.

After all, cement is not coal root, just knowing the formula is useless, the key to its production lies in the exact firing temperature and the correct ratio of raw materials.

If these two things are not done well, the quality of the burned cement will be very poor, and even the building will collapse on its own.

It was not until the middle of the 19th century that people summed up these two valuable experiences and explored the most suitable temperature and the most suitable raw material ratio.

The latter is okay to say, the former in the era when there was no infrared thermometer, just to tell you how many degrees are appropriate, you still haven't counted.

So how do you determine the temperature in this era? Zhao Hao's answer is to look at the firelight.

The flame that first glows is 500 degrees, 600 degrees crimson, 700 degrees red, 800 degrees cherry red, and 1,000 degrees cherry......

When the fire is white-hot and people dare not look at it directly, it reaches 1,400 degrees!

In the end, what kind of fire color should be maintained in the furnace, apart from him, only Hua Bozhen and a few technical backbones know in their hearts, which makes it difficult for others to steal secrets.

Well, in fact, the fire color should be kept white-hot, which is 1,400 degrees. So it's completely impossible to use firewood.

Fortunately, there is coal in Xishan, but the quality of the coal is not good, and it is barely burned red normally. If it is crushed into pulverized coal, it can only be burned cherry red.

At the beginning, Zhao Hao stayed in Xishan for so long, and most of the time was spent on ideas to increase the temperature of the furnace.

Later, I listened to Hua Bozhen's suggestion, adopted the structure of Wuxi brick kiln, built a high kiln with automatic air suction, and several air boxes kept pulling, which finally reached the furnace temperature.

By the way, even Hua Bozhen didn't know that refractory bricks were used to build high kilns. Because the bricks on the island are made of kaolin, which is unique to Nishiyama, it is a refractory brick.

The bricks fired from ordinary clay elsewhere simply cannot withstand the temperature in the high kiln......

No way, who let the cement island ...... Oh no, Xishan Island is so sweet and has it all?

Moreover, Xishan Island is still an island in a lake, so it is easier to keep it secret.

~~

After visiting the cement yard, Zhao Gongzi's hair was already gray.

He took off his sunglasses from the bridge of his nose and took out a handkerchief to wipe the dust off his head. In order to avoid becoming a panda, Zhao Hao resolutely rejected Hua Bozhen's arrangement and did not go to the 'Jiangnan Coal Yard' to inspect today.

When I went back, it was still the same gunslinger camp, and the original camp headquarters was completely changed to the residence of Zhao Gongzi when he went to the island, and it has changed greatly.

The original dilapidated wooden house was completely demolished and rebuilt into a new brick house, with white plaster, black tiles on the walls, cement in the yard, and the wellhead sealed and installed a suction pump.

Oh yes, it's called the Drain King.

Qiaoqiao and Secretary Ma have lived on the island and know how dirty the cement yard is. The two wisely did not follow, and came directly to clean up the residence, boiled water and waited for Zhao Hao to come back.

Seeing that he really entered the yard with a disgraced face, the second daughter teased him while helping him wash his hair and take a bath.

After Zhao Gongzi refreshed up, it was already dark.

Zhao Hao asked Xu Yuanchun and Xiao Zhi to call for dinner.

He was going to ask Xu Yuanchun what Xu Kun and Xu Kun had talked about, but he thought that it would affect his appetite too much, so he wisely didn't speak.

The heart said that this guy would definitely ask for himself anyway, and he would talk about it when the time came.

After dinner, when Zhao Hao was about to send off the guests, Xu Yuanchun suddenly knelt on the ground.

Zhao Gongzi said in his heart, he came, although he was late.

"Teacher, please accept the disciple!" Who knew that this guy didn't mention his second uncle at all, but talked about apprenticeship again.

"Uh......" Zhao Gongzi was a little big-headed, and said in his heart, why don't this young people play cards according to common sense?

He helplessly asked the persistent Xu Yuanchun: "What do you want to learn?" So persevering. ”

"Teacher, I want to learn this." Xu Yuanchun took out the physics book from his sleeve, turned to the middle page, and presented it to Zhao Hao with both hands.

Zhao Gongzi took it and took a look at it by the light, only to see that the title of this page was called 'Trick Plate'. This is a small experiment he gave to explain 'how people see things'.

It is to use the principle of 'visual residue' to draw the decomposition of the characters on the disc, and then use a disc with an open window to cover the previous one. By turning the disc at the back in this way, you can see the figure moving through the window of the disc in front of you.

"You're going to learn...... Animation? Zhao Gongzi looked at Xu Yuanchun in surprise, he didn't expect that his popular science booklet would actually help this former Shoufu grandson awaken the amazing attribute of the dead house.

It can be said that it is the first dead house on earth.

"Animation...... That's right, it's a painting that can move! Xu Yuanchun nodded excitedly, took out a book from his sleeve, handed it to Zhao Hao with both hands, and said, "Teacher, please see, this is the first 'animation book' made by students according to your teachings!" ”

"Oh, flipbooks?" Zhao Hao took it over, flipped through a few pages, and saw that the pictures on each page were coherent. Hold all the pages in your right hand and let go of your finger little by little.

In the sound of flipping through the book, the characters in the book moved.

The painting is actually the picture when he was in Yuyuan Pond and took a hot air balloon to the sky.

From the hot air balloon to the distance, it comes to life as if it were yesterday.

But it's not just reappearance, because after the hot air balloon lifted off, there was a flying sky and a phoenix flying together, obviously Xu Yuanchun carried out artistic processing again.

Zhao Hao quickly finished reading it, and couldn't help but praise: "This one." ”

Xu Yuanchun's heart was full of joy, and he took out a round copper box from his bookbag and continued to offer treasures.

When he opened it, it contained a trick plate he had made. But it is different from what Zhao Hao introduced.

He was on a rotatable disc with a circle of cardboard tape dipped vertically. Then I drew on the inside of the paper tape, and made thin vertical holes in the paper tape.

Zhao Hao rotated the disc, and because of the 'visual residue', those vertical holes seemed to be motionless. Through the vertical hole, you can see the sassy and heroic posture of a girl in red skiing in the snow, and I don't know who the prototype is.

It's much more vivid than a flat trickery, it's really like watching a cartoon.

"Niu Boyi!" Zhao Gongzi gave two thumbs up.

"And more!" Hearing Zhao Hao's praise, Xu Yuanchun's morale was greatly boosted, and he made persistent efforts to take out a round glass plate from the copper box.

As I said before, Western glass has long been transmitted to Daming, and the Ming Dynasty can also produce glass, but there is a problem, it is expensive...... But he is Xu Huating's grandson.

Zhao Hao saw that he drew the storyboard on the glass this time, and also covered most of it with a paper shell, leaving only one blank space.

In the center of the glass disc, there was a round hole, and a wooden rod was inserted as a shaft.

Then Xu Yuanchun put it up, took it to the candle, and asked Xiao Zhi to help him turn the glass plate, and a slightly blurred horse was projected on the white wall opposite, but the running movement was very smooth!

"it, trick projector!" Zhao Gongzi shouted excitedly: "You are such a fucking genius!" ”

Xu Weizhi was also so excited that his brain was hot, so he gritted his teeth and lifted his robe, knelt down side by side with Xu Yuanchun and said:

"Teacher, please accept the disciple too, I also want to learn animation!"

ps. The fourth shift, it's gone tonight......