The whole family travels through time and space, and the three of them struggle together

When Zhou Dajiang assigned the project, he said that making the first aid kit was difficult. The difficulty lay in the outer shell.

Wood will become heavier as it absorbs water. If it is cast in metal, there is sand casting method in ancient times, but the cast bronze is large and heavy, and it is not convenient to carry.

Fortunately, Qian Chuanbai has researched rubber, which is perfect. This time I can use the medicine box to practice.

The raw materials for Eucommia ulmoides were still on their way, but Zhou Dajiang hoped to figure it out as soon as possible while he still had some free time. He also needed to figure out how to sell the farm produce later.

There was no other choice, so Xue Ren had to use his connections with Datong Trading Company and buy a batch of raw materials by shipping.

After several sessions of instruction from Qian Chuanbai, the workers had become proficient in extracting Eucommia gum and were soon able to extract the rubber needed to make the medicine boxes.

On Zhou Dajiang's side, he also asked Zhou Dahe and Tian Mujiang to make three sets of mold cavities, one box body and two box covers.

Because the medicine box also needs to be installed with water storage and pumping devices, two round openings of different sizes are designed on the medicine box.

There are also two box lids, one of which is particularly large. Zhou Dajiang also asked Carpenter Tian to make threads for it in the mold so that the cast box lid can be directly rotated and twisted onto the box body.

With the previous experience of making rubber gaskets, everyone knows that the rubber needs to be melted first, then cast into the mold, and then wait for it to cool and take shape.

Because the box is quite large, I practiced with the lid first. Fortunately, this step was not difficult. After making a mistake once, I succeeded quickly the second time.

But the cabinet was not that simple. After trying several times, the upper part of the cabinet could not be formed well, and the same was true when Zhou Dajiang tried it himself.

The research suddenly reached a deadlock.

Zhou Dajiang had no choice but to stop for a while and go home to look for inspiration in books.

But in this dynasty, there was no rubber molding technology for him to refer to, and it would be useless to search on his own. It would be better to ask his wife and daughter while they were alone, to see if they had any ideas.

Although Chen Xiuying doesn't know much about casting, she is good at simplifying things.

"If something is too big to be shaped, just separate it. It's like washing dishes. You always like to lather up all the dishes first and then wash them all at once. That way, it looks like you've been busy for a long time, but there are still the same dishes in the sink. If it were me, I would wash them one by one. Although it uses more water, it means one less thing to wash. The same goes for processing. It doesn't have to be shaped all at once. If it's difficult, just take it apart and do it separately. There will always be a way to solve it all."

"It's okay to do it separately, but if the sealing is not done well, it will easily leak." Zhou Dajiang had considered doing it separately, but he had never figured out how to seal it.

Zhou Sisi interjected, "That's not that difficult. Isn't it soluble when heated? Just solder it with a soldering iron!"

Zhou Dajiang suddenly understood what was going on. That's right! Why didn't he think of that?

So, I didn't even have time to eat dinner or attend my father-in-law's class. I immediately rushed to the factory to solve his problem.

It just so happened that several technical backbones were there, and after everyone discussed it, they decided to split the box into two parts, cut off the part that was difficult to form, and make a separate mold for it.

After the modifications, the cabinet was quickly completed. Zhou Dajiang made a handheld sickle-shaped soldering iron, heated it red, and used it to solder the edges of the upper and lower cabinets. Once the edges melted, he pressed them together, soldering and pressing a little at a time until a complete cabinet was created.

Everyone cheered at once. The problem that had troubled everyone for many days was finally solved.

Zhou Dajiang didn't need to do anything anymore. Tian the Carpenter and Zhou Dahai installed the water pump and the spraying pole. Thus, a backpack sprayer that shocked the imperial court and was strongly recommended by the Ministry of Agriculture was born.

Of course, Zhou Dajiang and the others didn't know at the time that their momentary interest in research would soon lead to widespread public knowledge that the backpack sprayers originated at the Qingshangou Processing Plant. Datong Trading Company, because of these tools, had designated the plant as a key development target. Xue Jing also made another visit, bringing a large sum of money and directly having Xue Ren build two more large factory buildings. He then separated the rubber extraction and rubber molding operations. But that's all for later.

After Zhou Dajiang developed the backpack sprayer, he stopped going to the factory. These new products, together with the previous tools, were enough to keep the factory busy for a long time.

His main focus now shifted back to the peach tree.

Under the careful care of Yu Quan and his son, the peaches are growing very well.

Chen Xiuying also removed the outer bags of the peaches according to their size, allowing them to enter the final coloring stage. It is estimated that they will be ready for sale in about ten days.

Zhou Dajiang picked one and tasted it. It was quite sweet, to be honest. He wasn't sure if it would fetch a good price. He'd wait until he was in a good mood and take it to town to try.

It was already summer, and in the evening everyone no longer stayed in their rooms. Instead, like last year, they all went to the yard to enjoy the cool air.

Normally, it's time to start making cold noodles when the weather gets hot, but since the recipe has been sold to Lai Fu Restaurant, they can't sell it in town and can only sell it to villagers, letting them go door to door.

It’s a pity that most of the families in the village now work in factories. With their living conditions improved, they are no longer willing to work hard to earn a living, so no one has come to visit us.

Because Zhou Dajiang skipped classes a while ago, Master Chen took him into the study for a small lesson. Chen Mingyuan was also taken in. Even if you don't attend class, you can still audit it!

Because Zhou Sisi has been behaving well recently, she has been treated specially by her grandfather and is allowed to go out for some fresh air.

However, the little girl has been a little upset recently because she found herself particularly greedy since she learned that Xiaohua was producing milk. She is not greedy for milk, but for cake.

She had been craving it for a long time and had pestered Chen Xiuying before, but she asked her to wait, saying that there was no milk at home. So, she hoped every day that Xiaohua would give birth soon. When Xiaohua gave birth, there would be milk and she could eat soft chiffon cakes.

Now that Xiaohua had also started producing milk, she couldn't hold it in any longer. Seeing that Chen Xiuying was fine, she went over to her mother and said, "Mom, Xiaohua has given birth and has milk now. Can you make egg cakes now?"

Mrs. Yu said, "Miss, what kind of egg cake do you want? I can make it."

“It’s not steamed, it’s baked.”

When Mrs. Yu heard that it was baked, she looked at Chen Xiuying and said, "I have never baked an egg cake before."

Xiao Xiangsheng, who was standing nearby, heard about the egg cake and thought it was what his aunt was feeding him. He stopped eating, walked over with a small bowl, and handed it to Zhou Sisi, "Here! Egg cake!"

Chen Xiuying was so fond of him that she held his little face and took a sip of his sweet breath.

Then she said to her daughter, "Mom can make it for you, but you have to ask your dad to build an oven first. Only with an oven can you bake it.

The last time I ate spring rolls, I thought, if we had an oven, could we also try roasting a duck?

After hearing what she said, Zhou Sisi immediately started craving for roast duck again. No, she had to ask her father to set up the oven!