The printing of the Tang Dynasty used block printing, which was not only time-consuming, laborious and costly, but also led to the high price of books. With movable type printing, the cost of books would have been reduced by at least half. All the people of the family saw the benefits, and it was another round of bidding, and movable type printing was taken down by the Qinghe Cui clan.

Next, Zheng Guanyin asked people to get matches again. After verifying the convenience of matches, Fan Yang Lu took down the method of making matches.

Zheng Guanyin put his hand into his wide sleeve and actually took out two lilac water glasses from the storage compartment. Familiar, right? It was the Coca-Cola cup she once took out in Chai Rong's world.

Zheng Guanyin put the cup on the table in front of him.

All eyes were glued to the cup. Such a bright color, such a crystal clear texture......

"This glass cup can be said to be a rare treasure!" The head of the Lu family swallowed and said.

"Cousin, do you want to sell the recipe for making glass? This is our Zheng family's recipe, if you sell it to others, how can you explain it to the family? The head of the Zheng family said busily, he stared at Zheng Guanyin with burning eyes, and hoped that Zheng Guanyin would be able to know the recipe of such a beautiful glass utensil for free.

Zheng Guanyin smiled: "Cousin, this is not glass, it's glass." ”

"Glass?"

Zheng Guanyin said: "Glass is more crystal clear than glass, and it is more convenient to fire than glass, and the most important thing is that the cost of glass is much lower than that of glass." ”

"Is it really that cheap?" The crowd asked in disbelief.

Zheng Guanyin nodded: "I, Zheng Guanyin, swear by my honor." ”

Everyone believed Zheng Guanyin's words. It is lower than the cost of colored glass, simple to make, and more beautiful than colored glass...... Everyone began to scramble frantically, and finally the principal of the Zheng family grabbed it at an absolutely high price.

For the sake of self-canonization, Zheng Guanyin gave the Zheng family a small mirror and the method of making the mirror, which made the Zheng family happy.

Zheng Guanyin glanced at Li Chengdao beside him, and Li Chengdao retreated. After a while, the guard lifted the tent, and Li Chengdao came in on a strange thing made of wood, and rode twice in front of everyone.

Everyone's eyes bulged out.

The head of the Guo family said: "Is the thing that His Royal Highness is riding the legendary wooden ox and flowing horse?" ”

Li Chengdao laughed and said, "No, this thing is called a bicycle." If you push the pedals with your feet and drive the wheels forward, as long as your legs are strong and you pedal fast, the speed of the bicycle will be very fast, and you can catch up with the speed of horseback riding. ”

Zheng Guanyin took his words and said, "In addition to bicycles, there are also tricycles. The tricycle can pull goods, no worse than the ox cart, and the speed is even faster. ”

The head of the Zheng family ran to Li Chengdao's side, and said with a smile: "Your Royal Highness, can you let me ride a bicycle too?" ”

Li Chengdao nodded: "Okay, but the space inside the tent is too small, let's go outside and ride." ”

"Okay, okay." The principal of the Zheng family happily responded, took the handlebars of the bicycle from Li Chengdao, and walked out of the tent. The other principals were also interested in the bicycle and immediately followed out of the tent.

Li Chengdao instructed the principal of the Zheng family on how to ride a bicycle, while the others listened and wrote down the essentials in their hearts. When the principal of the Zheng family learned to ride a bicycle and rode happily, he was immediately pulled down by others, and everyone stepped forward one by one to ride a bicycle. Later, Zheng Guanyin asked people to push the tricycle up, so that everyone could see how the tricycle pulled goods. Eventually, the drawings for the tricycle and bicycle were obtained by Cheongha.

Zheng Guanyin took advantage of the fact that everyone was outside the tent, let people move a large stone pier made of cement powder and Yong cement, and let people personally demonstrate the use of a dry cement in front of the principals. The principals immediately understood the usefulness and benefits of cement, and competed for bids, and finally fell to the Wang family.

After that, Zheng Guanyin took out the production methods of hot water bottles, hydro-looms, and boats in the Ming Dynasty and sold them to the principals of the family.

Zhong Libo led people to sort out the silver money and grain obtained from this transaction, which was so large that he didn't have to worry about silver money and grain for ten years after that. Zhong Libo admired Zheng Guanyin so much that he sighed in his heart. The crown princess has such a talent, but she didn't show it before, so she was disappointed in the prince, right? I heard that the prince is dedicated to the beauties in the house, and he is just a face-saving affection for the princess, no wonder the princess is so capable but does not show it to help the prince. Alas, the prince has knowledge, I don't know if he will regret it?

With plenty of money and plenty of food and grass, it stands to reason that the team should move on, but because of the weather, they had to stay for the time being. Winter is coming soon, and the weather in the north is very cold, and it will snow a lot, and if you continue to walk, I am afraid that half of the people will freeze. It is better to stay on this mountain first, and wait until the winter is over before continuing the trip.

Cao Chengji, another assistant promoted by Zheng Guanyin, suggested to Zheng Guanyin: "The temperature on the mountain is lower than that under the mountain, why don't you go to camp at the bottom of the mountain?" ”

"No." Zhong Libo retorted, "Although the magistrates don't seem to dare to oppose us, it's hard to guarantee that they don't contain bad water and want to destroy us. The mountain is easy to defend and difficult to attack, or it is safe to live in the mountain. ”

"But it's too cold on the mountain, and everyone will freeze." Cao Chengji is a typical example of being afraid of cold. He was physically weak, and he was most afraid of cold in winter.

Zheng Guanyin spoke: "There is a lot of cement made last time, let everyone use stones to build a house and cooperate with cement." ”

Cao Chengji and Zhong Libo no longer quarrel, it's better to have a house to live in, it's hotter than living in a camp tent, and I'm not afraid of being frozen. Cao Chengji thought about it, and stayed in the house this winter without going out.

Zheng Guanyin lifted the brush, dipped it in ink, and drew a sketch on the paper.

Li Chengdao stretched his neck and looked at it for a long time, but he didn't see what was drawn on the paper at all, and asked Zheng Guanyin out loud: "Mother, what are you drawing?" ”

Zheng Guanyin said: "This is the drawing of the production of the fire kang. ”

"Ondol?" Li Chengdao and Cao Chengji looked at Zhong Libo, they had never heard of this name, let alone what a fire kang was.

"A fire kang is a kind of heating device, made of stone and earth, with a flue inside, covered with a relatively flat stone slab, which is covered with mud and smoothed, and after the mud is dried, you can sleep on it with bedding. This is the stove mouth, put firewood in it to burn, and the smoke and heat generated by the flue in the kang are heated by the stone slab on top to generate heat, so that the kang becomes hot and for people to warm ......"