Li Shimin's skills are natural, and he just rolled over the fence with just one side roll.

The geese took advantage of the victory to pursue, and even stretched their necks out of the cracks in the fence and shouted at Li Shimin.

Li Shimin glanced at the group of geese with palpitations, if he hadn't known that this group of geese couldn't withstand his fists and kicks, he would have swept over with one leg a long time ago.

These damn geese! Be careful to destroy your nine clans!

Li Chengqian looked at his father's embarrassed appearance, and wanted to laugh, but he was holding back.

The Father makes a fool of himself, and the Son laughs. This is an act of unfilial piety.

The dealer grinned: "Haha, I forgot to tell you that this group of geese recognize people, it's okay, wait for you to feed them for a few more days, and they won't bite you." ”

Li Shimin said angrily: "Wait for me...... When I get home, I must stew a goose and eat it! ”

……

In the vicinity of the Tianxia Manor, there is only one small river with a strong flow that can be used as a source of water supply.

Leng Feng walked to the river and found that there were many carpenters sawing wood and making planks, and Li Ke was in charge of directing in the craftsman pile.

A huge waterwheel has been erected on the side of the river, and as early as the time of Emperor Ling of the Han Dynasty, there was a "rollover" to draw water. But this watermill isn't just for drawing water.

The river is turbulent, and the width of the waterwheel is also sufficient, so this waterwheel turns fast.

Li Tai and Yan Liben squatted on the shore, looking at the waterwheel in a daze. Since he was told about his illness and completely dumped the prison to Yan Lide, Yan Li has been completely idle, following Li Tai all day long, learning new knowledge such as the "Law of Leverage" from Li Tai.

Leng Feng walked up to the two of them and squatted down and asked, "What are you two doing?" ”

Li Tai saw that the master was coming, and immediately came to his senses, hugged Leng Feng's arm and asked, "Master, you came too coincidentally, please help us take a look, our waterwheel bearings always can't withstand the pressure of the high-speed rotation of the waterwheel." ”

"Bearings?"

Leng Feng was stunned, what is the bearing?

There was a plank bridge from the shore to the waterwheel, so Leng Feng walked over and looked at the waterwheel.

Datang's carpenter craftsmanship is still good, and the whole waterwheel is quite up to standard, but it's just ...... How is the place where the bearing should be a ceramic weird thing?

"The bearings you are talking about...... It's not going to be this! ”

As soon as Leng Feng pointed to the shaft of the waterwheel, he heard a click, and the waterwheel, which was originally spinning rapidly, immediately slowed down and made a creaking sound.

Li Tai said: "This is it, this is it." ”

Yan Liben beckoned the craftsman to come over, and it took a lot of effort to unload the waterwheel bearings.

Leng Feng looked at this weird-looking thing very helplessly, this is the ancient bearing?

Yan Liben pointed to the broken bearing and said: "The water flow is turbulent, and the bearing cannot withstand the continuous pressure, which will either cause the wooden shaft to rub and break, or the bearing will break." It's hard to use it as a power source for a waterway! ”

Leng Feng knocked on the bearing and asked, "Haven't you thought about replacing the central axle of the waterwheel and this bearing with iron?" ”

Li Tai said with a bitter face: "I've thought about it! However, it is the same reason, the friction between iron and iron is more intense. ”

Yan Liben said with emotion: "This is an unsolvable problem! King Wei, we've experimented many times, and we're about to ask you for help! ”

Datang's blacksmith craftsmanship has not yet reached the point of manufacturing ball bearings, but cylindrical roller bearings are estimated to be able to be made. (Ball bearings are bearings with iron balls in the middle, and cylindrical roller bearings are bearings with metal cylinders between two layers, and I just know that bearings are divided by numbers, such as 6203 or 30207, and I specially checked the scientific name...... ）

took the two of them to the Thunder Division, Tiesheng's craftsmanship is very exquisite, and it is estimated that it is not difficult to make a cylindrical roller bearing.

Leng Feng drew a picture, explained it to Tie Sheng, and asked a little worriedly, "Can you do it?" ”

Tie Sheng thought carefully for a moment before saying, "I can do it!" But...... Can you make it bigger? It's easier to make it bigger, and I'll be able to do it quickly. ”

Leng Feng thought about the appearance of a bearing with a diameter of 20 centimeters, it should be no problem!

Yan Liben said impatiently: "During the time you spoke, the fires were lit!" Measure for yourself how to do it! ”

Yan Liben had always had the worst temper when he was about to serve as a prisoner, and Tie Sheng didn't dare to delay and immediately started to make it.

Yan Liben took the drawings and said to Leng Feng: "Landlord, I looked at your design drawings and thought of the appearance of the finished product, it is indeed very durable, but even if it is called a bearing, I am afraid it can only last for a year." ”

Leng Feng said impatiently, "Won't you give it some more lube!" With lubricating oil, how can you last another year. ”

"Lube? What kind of oil is lubricating oil? Yan Liben and Li Tai both looked at Leng Feng with a confused look.

“……”

"Oil is fine, oil can be settled!"

Yan Liben slapped his head suddenly: "Are you talking about stone paint?" ”

"Stone paint?" Leng Feng said: "Is it black, the kind that can be ignited?" ”

Yan Liben said: "According to the Eastern Han Dynasty Bangu's "Hanshu Geographical Chronicles", it is recorded that "Gaonu County, Shangjun County, has water, fat and combustible."

Jin Zhanghua pointed out in the "Naturalist": "Water and fertilizer are also there, and it is not only in Gaonu County's Weishui'."

Li Daoyuan of the Northern Wei Dynasty also quoted the "Naturalist Chronicles" in the third volume of the "Commentary on the Water Classic": "In the holding vessel, the beginning is yellow and then black, such as condensation, but (burning) is extremely bright, and it is no different from the ointment." The plaster car and the water are very good, and the people call it stone paint'.

Is that what you're talking about? ”

I hate the ancients quoting scriptures the most, Leng Feng's classical Chinese is very poor, and he can only roughly understand the meaning. But judging from "black", "flammable", and "like paste", it should be oil!

"That's right, this is this thing, although this thing has not been refined, but it can also be used as lubricating oil, and it can be applied to the bottom shaft and bearing, which can reduce friction resistance and prevent rust."

Yan Liben was overjoyed: "The Ordnance Supervisor has this thing, they are studying how to replace the fierce fire oil with stone paint, there is a lot of stock, if you can ask Your Majesty to give an order, just ask for a bucket!" ”

Speaking of "Your Majesty", Leng Feng remembered that Li Shimin still wanted to see his two younger sons, so he asked Li Tai to call Li Ke to go to the chicken farm to find his emperor's father, and by the way, he asked for a bucket of stone paint.

After taking Li Tai away, Leng Feng and Yan Liben waited for Tie Sheng to build a bearing.

Towards dusk, Tiesheng made a standard bearing.

Leng Feng found a wooden stick from the side and asked Yan Liben to cut it properly and stuff it into the middle of the bearing.

Yan Liben pressed the outer ring and turned it hard!

Sou!

The bearing slid up quickly.

Yan Liben was as obsessed as he saw a beautiful woman when he watched the bearing, and he couldn't help but say: "This thing can be applied to many places, and the angle of the printing machine has it, so you don't have to worry about wear and tear, and you can also speed up the printing speed!" ”