The next day it was dark.

Zhao Gongzi got up early and went to see Xu Erye pouring night incense...... Not really!

Recently, he became obsessed with running, because Zhao Shizhen in Kunshan asked Zhao Shixi to send him a pair of running shoes.

What, you ask, where did Xiwa come from? That day, he was tied with Liu Yuanwai's son, and Zhao Hao was the one who was the piano boy.

Speaking of this pair of running shoes, its upper is soft and delicate calfskin, the cutting stitches are perfect, and the upper is embroidered with a pair of 'Zhao' characters, which is very stylish.

But what really excites Zhao Gongzi is that the black soles of these shoes are made of eucommia glue!

When making hot air balloons in Beijing, Zhao Gongzi discovered that the craftsmen who made the Aoshan lanterns would use a special glue, heated and brushed on the silk skin, which could release water and flame retardant and make the silk impermeable.

At first, he thought it was fish maw gum, but after asking the craftsmen, he learned that the main raw material of this gum was actually extracted from the bark of the eucommia tree.

This made Zhao Gongzi ecstatic, he always thought that the rubber industry of the Ming Dynasty would not start until his tentacles reached Nanyang.

But I forgot that there is a substitute for Daming - that is eucommia gum!

As the name suggests, this gel is produced from the precious medicinal herb Eucommia ulmoides, which specializes in treating kidney deficiency and egg pain.

However, the leaves and bark of Eucommia ulmoides contain a large amount of Eucommia gum, which is chemically identical to that of natural rubber.

However, the molecular structure of Eucommia gum and rubber is different, which leads to the fact that natural Eucommia gum does not have the elasticity of rubber, but is like a piece of hard plastic.

As a lover of "Approaching Science", Zhao Gongzi still remembers how to deal with Eucommia ulmoides gum. That's vulcanization.

Depending on the degree of vulcanization, natural Eucommia gum can be either a resilient rubber or a hard plastic. This soft and hard property is called 'rubber and plastic duality'.

And the simplest vulcanization is to put eucommia gum and sulfur together and bake it on the stove!

Of course, what specific ratio, what temperature to bake, and what condiments need to be added, Zhao Gongzi doesn't know.

I can only leave it to the eldest nephew who loves research to explore.

From handing over this project to Zhao Shizhen to now, it has only been three months, and Zhao Hao has put on the first pair of rubber running shoes in the Ming Dynasty.

And the eldest nephew was addicted to making guns and couldn't extricate himself, otherwise he would definitely come out faster.

~~

Zhao Gongzi is looking forward to this historic pair of running shoes, the effect can be equivalent to the liberation shoes of the seventies and eighties.

Who knew that when he stepped on the ground after putting his feet, he was extremely elastic and very soft, which greatly exceeded his expectations.

Maybe he has forgotten what it feels like to wear sneakers, anyway, Zhao Hao feels that his feet are wrapped all of a sudden, the soles of his feet are protected, and his knees are cushioned, so I'm really sorry for these shoes if I don't run.

When he ran out of the battalion headquarters in the company of Gao Wu, he heard a clanging and creaking sound behind him, and smelled a pungent smell.

Following the smell, I turned my head and saw Xu Erye struggling to push a dung truck and staggered out of the barracks at the back.

There was a string of iron hooks hanging next to the car, and most of the hooks were hung with urine buckets and night pots.

At present, there are more than 2,000 reinforcements on the island, including the prisoners and Wu Ji, and the camp is almost full.

Jinke, who is in charge of the order of the entire camp, strictly prohibits open defecation, and must go to the toilet in the thatched house during the day and use the toilet at night.

This is not Zhao Hao's request, Zhao Gongzi has always let Jin Ke do it himself.

This is the regulation that Jin Ke brought from the Qi family's army.

Qi Jiguang found that as long as the soldiers did not drink raw water and maintained good personal hygiene, the attrition of soldiers due to illness in the army could be greatly reduced. Naturally, there was a corresponding requirement in his military regulations.

After Tong Zigong lashed dozens of prisoners and militiamen who violated the rules in a row, no one dared to defecate in the open anymore, and even other aspects of discipline were much better.

Zhao Hao covered his nose and was about to run away.

Behind him, he suddenly remembered Xu Kun's hoarse shout.

"Zhao Gongzi, I am willing to give you 10,000 taels of silver, can you let me go?!"

Zhao Hao turned around and said while running away:

"This son will give you 20,000 taels of silver, will you continue to pour it for a year?"

Tong Zigong, who was about to be killed for a thousand years behind Xu Kun, couldn't help but raise his hand when he heard the words and said: "The son gave me 20,000 taels, and his subordinates are willing to pour ten years." ”

"Haha, I'll think about it." Zhao Hao rolled his eyes secretly, why does this guy not know how to look at the atmosphere so much?

"Zhao Gongzi, please give me a happy word, how can you let me go?" Xu Kun mourned again: "I can't live a day like this." ”

"Look at how you behave. If you behave well, you can be sent home for the New Year. If you don't perform well, just pour a lifetime of night incense on Xishan Island......"

When Zhao Gongzi ran to the gate of the camp, he suddenly stopped moving forward and laughed loudly: "By the way, if you want to go back immediately, it's not impossible." ”

"Ah, Childe, tell me quickly!" Xu Kun was very excited when he heard this, although he had only been with the toilet for a few days, he felt that he had died in a sense.

He was willing to exchange his entire wealth for freedom and a chance to be born again.

"Let your brother do it for you."

Zhao Gongzi dropped the sentence that he was angry and did not pay for his life, turned around and ran away without a trace.

"I, I knew you were a bad ......" Xu Kun's resentful scolding stopped abruptly, and a miserable scream of 'whoop' resounded through the barracks.

~~

After Zhao Hao ran out of the barracks, he went north to Yuanshan and ran along a black road towards the Jinduo River.

This road was originally there, and it is estimated that it was built by the original islanders.

On the second day of his arrival on the island, Zhao Gongzi organized a large search team of 100 people, preparing to go into the mountains to find water bandits...... Well, actually to find coal.

There is no coal, only limestone, and burning cement is wishful thinking, because the temperature cannot reach it.

Although he knew that the coal mines here must be visible on the surface, Xishan Island was so big that Zhao Gongzi was prepared to find no coal for a month.

But who would have thought that as soon as he bypassed Wonsan, he would see this black and shady road.

Zhao Gongzi looked at this road so familiarly, grabbed a handful of black stones and looked at it, sure enough, the coal gangue ......

He and the search party then followed the gangue road to the Jinduo River. After crossing the river by boat, there is also a coal gangue road on the opposite bank.

A few miles further north along the road, you will see black coal fields at the foot of the mountain......

The search is over.

~~

Zhao Hao thought that the islanders had a history of using coal.

But when I asked Liu Yuanwai later, I learned that although the people of Xishan knew that these coals could be burned, they had never used them.

Because it is the south of the Yangtze River with abundant vegetation, there is endless firewood and grass, and there is endless charcoal to burn, who would think that it would not use choking and dirty coal?

You don't need that high temperature to cook......

The reason why people dug up coal fields was to pave roads with coal gangue, but the real coal was all discarded.

It seems that there is no play in doing coal lotus root business in Jiangnan, which makes Zhao Gongzi a little congested.

Fortunately, the industrial coal used to burn cement, bricks and even iron-making has finally been settled, which makes Zhao Hao feel very comforted.

ps. Fifth update, thanks to the new alliance leader '*(T_T)*'.