The whole family traveled through time and became doctors, raised children and farmed in ancient tim

After Mr. Zhao left, Xie Songlin took Xie Wanxing and pretended to go for a stroll in the back mountain. As they walked, the father and daughter looked around from time to time, pretending to be leisurely enjoying the scenery, for fear of arousing suspicion from others.

After reaching the back mountain and making sure that no one was paying attention, they quietly entered the space under the cover of bushes.

Xie Wanxing picked up an orange from a basket by the field and peeled it while asking, "Dad, do you have any idea about the conveyor belt that Grandpa Zhao mentioned?"

Xie Songlin was standing not far away, looking at the crops in the fields, as if thinking about something. After hearing Xie Wanxing's question, he turned around, took a few steps towards Xie Wanxing, then bent down and picked up an orange to eat. "Of course not, I feel that this kind of linen or cotton cloth is too easy to break when used as a conveyor belt. I must find some special materials to make this conveyor belt. But in ancient times, it was really not easy to find the right materials. I have to think about it carefully."

After saying that, he had already peeled the orange, broke off a segment and put it in his mouth, taking a light bite. The sweet juice instantly spread in his mouth, but his brows were still slightly furrowed, and he was still thinking about the substitute material.

"My knowledge in this area is definitely lacking. Although I drew a design after studying the books in my study, I don't know much about the material." Xie Wanxing sighed. "Rubber is used to make conveyor belts nowadays. Rubber has excellent elasticity and toughness, and can withstand huge friction and tension for a long time, so it is an ideal material for conveyor belt production."

Xie Wanxing frowned and continued as he paced, "But this is ancient times. Where can we find rubber? It's a strong, imported product, and it's definitely not available today. Rubber trees also mainly grow in tropical regions, like Southeast Asia or parts of South America. The geographical environment and climatic conditions in many parts of Dajing are very different from those in tropical regions, so it's impossible for rubber trees to grow naturally. Moreover, even if rubber trees were transplanted here, according to the ancient planting techniques and environmental conditions, they would have a hard time surviving here."

After hearing his daughter's words, Xie Songlin rested his chin on his hand and fell into deep thought. After a moment, he looked up with a hint of anticipation in his eyes and asked, "Is there any plant in this era that can extract usable gum like the rubber tree?"

"Yes! Got it!" After hearing her father's question, Xie Wanxing seemed to have a flash of inspiration in her mind, but it was just a vague image. She tried hard to visualize this image and tried to dig out the corresponding plant name from it.

"It's called...what's it called!" She murmured softly, her voice filled with anxiety and unwillingness. Her fingers twisted the corners of her clothes unconsciously, and her eyes revealed a trace of confusion. "It's Chinese medicine! Chinese medicine...I can even imagine what it looks like!"

"Its stem is a bit tough, not very thick, but very strong." Xie Wanxing gestured while trying to recall the characteristics of the plant. "Its flowers seem to be small and not very bright in color, but a light color, maybe white or light yellow."

She jumped on the spot and said anxiously, "I remember it wasn't very picky about the environment it grew in. I think you can find it on wild hillsides or roadsides. Its glue... yes, its glue is a bit sticky, but different from honey or something like that. It's more elastic."

Xie Songlin looked at his daughter anxiously and comforted her, "Don't worry, take your time to think about it. You can start with its purpose or the environment in which it grows. Maybe you can think of a name faster."

Xie Wanxing listened to his father's words, nodded, closed his eyes, and muttered, "It can be used as medicine, and the glue can be used to make some small gadgets. People in ancient times might have used it. It's not a precious plant, it's very common and very common..."

"Ah! I remember! It's Eucommia ulmoides! Yes, it's Eucommia ulmoides." Xie Wanxing shouted excitedly, his face full of joy.

Xie Songlin looked puzzled: "Eucommia ulmoides? Can this be used as a conveyor belt?"

Xie Wanxing saw her father's doubts and explained, "Eucommia ulmoides is actually a traditional Chinese medicinal herb that's quite common in Dajing. It contains eucommia gum. Although this gum is different from the rubber we use today, it has a certain degree of elasticity and toughness. I read in a book before that they are isomers, which means that eucommia gum can, to a certain extent, withstand a certain amount of friction and tension like rubber."

"Look, conveyor belts need materials that are elastic, able to withstand tension, and wear-resistant, right? Eucommia ulmoides has the potential to do this. Of course, I only have a preliminary idea now, and whether it will work or not still needs to be tested. But in ancient times when there was no rubber, Eucommia ulmoides might really be a direction worth trying."

After listening to Xie Wanxing's explanation, Xie Songlin's brows relaxed a little, but he still said with some concern: "Even if Eucommia gum has these properties, how can we extract Eucommia gum from Eucommia?"

"Dad, look. Eucommia has existed since ancient times and is relatively easy to obtain. We can start by extracting Eucommia gum from the bark of the Eucommia tree. I'm thinking of trying boiling it in water first. Although the amount extracted may not be large at the beginning and the quality may not be good, this is of course just a preliminary attempt. If we want to extract high-quality Eucommia gum on a large scale in the future, we will definitely need to continue to explore other better methods." Xie Wanxing said excitedly, "If it really works, this Eucommia gum can be used in so many places. We can make tires, bicycles, and even in the shock absorption and sealing parts of some equipment."

"We have to find a way to get some Eucommia ulmoides back home." She sighed helplessly and continued, "Also, Dad, you have to start repairing the house. We're all crammed together like this, and I have to stay under everyone's watchful eyes every day. I can't do anything. If I disappear for a while, my eldest brother will run outside to catch me like a thief."

"I'll think of a way. I'll take Dachun to buy bricks tomorrow. We all need to repair our houses. Let's see if we can get a group purchase price." Xie Songlin touched his chin and said at the end, "It would be great if I could make bricks."

Xie Wanxing: ...

Xie Wanxing stood there, looking at her father's face full of regret that he couldn't make bricks, and the corners of her mouth couldn't help but twitch.