open sea

Chapter 909 Units
Ancient China did understand both air pressure and water pressure, and they knew it very early.

In the Western Han Dynasty, there was a book called "Huainan Honglie", which is a Taoist book and also called "Huainanzi".

He has many disciples, and this Taoist book is a summary of his knowledge with his disciples. In addition to tofu, Liu An has also done an experiment on air pressure—a copper urn thundering.

He sealed the copper urn filled with boiling water and threw it into the well. The boiling water in the urn was cooled, and the air pressure and water pressure crushed the copper urn. The loud sound of the copper urn breaking was transmitted from the well, like thunder.

Another story is recorded in Ban Gu's "Hanshu". Regarding Wang Mang, someone took a big bird's feathers as two wings, covered the head and body with feathers, and flew hundreds of steps down by guiding the ring button.

The tentative explorations of the ancestors were all experimental and finalized, but there was no quantitative analysis and research, so it was impossible to make experiments into theories, and it was even more difficult to develop into practical subjects.

But now it's possible, especially after Chen Mu ordered Chang Sheng to gather enough craftsmen. Whatever they want to make, the craftsmen can make the model exactly within a day.

A wooden barrel with a lid at the middle height. The two openings of the lid, one large and the other small, are stacked upwards. When the water is filled with water higher than the lid, Chen Mu uses a square wooden block of the same size as the large opening to fit tightly into one end. Open the opening, the water on the other side will naturally overflow. After measuring the weight of the overflowing water, it is almost the same as the weight of the wooden block.

Chen Mu knows that this is not common sense of science, and now he tells others this truth. In the hands of Zhao Shizhen and Zou Yuanbiao, it has become science.

Experiments, measurements, analysis, and conclusions, they believe that in a sealed state, if more force is applied to one end of the water flow, the same force will be transmitted from the other end, and by extension, the water pressure is the same everywhere in the airtight liquid.

In this experiment, the mechanical unit they used was 'ji', and the principle they summed up was 'balance'.

The so-called "balance" comes from the summary of levers in the "Mojing": balance, if the weight is added to the side, it must be hammered, and the weight is similar.If it is balanced, the short standard is long.If the weight of the two additions is similar, the bid must be placed, and the bid will be awarded.

Chen Mu's comment is: save effort and cost distance.

"We can make a hydraulic press."

Chen Mu instructed Xu Wei to draw a new composition using the line drawing method with the aid of a ruler and other tools and deliver it to the Military Weapons Bureau. Soon the wooden parts were completed, including two wooden water tanks, one square and one round, and the middle one. Square wooden tubes, all closed positions are reinforced with multiple mortise and tenon structures and wrapped with small iron hoops on the outside.

The square water tank is large and is the main force tank. The square iron block is lifted up after being filled with water; the round tank connected to the square tank is a small tank that transmits force. The upper part is an air cylinder, and the inner piston can only be moved downward by air. Push open, but not upward.

The piston only inhales but does not exhale. Finally, there is a relatively long and thick force arm. At the end of the force arm hangs an eight liang weight. The weight is cast very delicately. One Ji'.

Zhao Shizhen looked at this thing with disgust in his eyes. What made him most ashamed was not the weight with special meaning, but that even the handwriting on it was his, his!

And he swears that he has never specifically written these four characters. The first time he saw this kind of half-pound weight, he was very angry. He wanted to know where the engraver got his own handwriting to make these weights. After he repeatedly... Well, there was no pressing question, the craftsman generously told him the source.

Marshal Dongyang took the four pieces of paper cut from the letter and asked him to carve it.

Cut it out, cut it out and engrave it... Following this kind of officer is a bad luck for eight lifetimes.

The instigator didn't have the slightest awareness of basing happiness on Chang Ji's pain. He clapped his hands and praised the exquisite workmanship of the weight, and pulled Zou Yuanbiao to squat in front of the machine that looked like a big table. Stop: "According to our calculations, this machine uses a force of one Ji every time, and through this balance bar, the force finally input into the cylinder is ten Ji."

"Tsk tsk, it's five catties, isn't it interesting?"

Zhao Shizhen stood angrily on the threshold with his arms folded, puffing from his nose like a cow, but neither of them paid attention to him, and looked at the machine happily.

Zou Yuanbiao then said: "The surface of the small water tank is eleven times that of the big water tank. Doesn't it mean that the weight of the auspicious mound can be lifted up and down ten times, and it can push up an iron square of fifty catties. Commander, this is Ichiro, it's amazing." !"

"Ji Tuo?" Chen Mu, who was squatting on the ground with no manners at all, patted his knees and said, "This name is good, and there are more. From now on, these two sides will be called input and output. Hurry up, go to Ji Tuo!"

Zou Yuanbiao lifted up his sleeves and put the small metal weight up, time and time again, seeing the iron block being pushed up bit by bit, just when the two were about to celebrate with each other, there was a bang, and the water splashed all over Chen Mu's body. .

The wooden water tank itself was slowly leaking water, and the inside couldn't bear the huge pressure, causing the wooden pipe to split, and the direction was just right towards Chen Mu, instantly turning Marshal Dongyang into a drowned chicken.

Zhao Shizhen was all smiles, while Zou Yuanbiao was singing along.

Chen Mu pursed his lips, raised his hand to wipe the water off his face, and laughed lightly himself.

Their theory is correct, and there is no big problem with the structure. As long as the wooden cylinder is replaced with an iron cylinder, this object can continue to be manufactured. If it is large enough, it may be able to produce a hydraulic press with a force of one barrel.

However, the biggest problem with his design is that it is pushed upwards. In order to press things down, there must be a strong enough upper metal platform. It looks a bit silly. He hasn't figured out how to make this thing properly apply pressure downwards.

Even if the force is slightly smaller, it can be used to squeeze oil or make other similar items. If it is really possible to make a hydraulic press, it should be able to be used for forging.

But every step in the future can be expected to be very difficult. Chen Mu has just been splashed by water, and the wood slag hits his robes.

"Let the craftsman make a smaller iron one. There are still many things to try later, but at least it is very useful now. If it is made of iron, it will be more powerful and can be used for mustard oil."

As soon as Chen Mu spoke, Zhao Shizhen stopped laughing, and took two steps to ask someone to prepare a change of clothes for Chen Mu, but Zou Yuanbiao was still having fun, until Chen Mu turned his head and looked at him with gloomy eyes: " What are you laughing at? Chang Ji, you said that the weight of [-] Liang is a bit big, let’s add another unit, what’s the name?”

"Master, do you still need to think about it?"

Zhao Shizhen turned his head and was happy, raised a finger in front of his face, and said to Zou Zhixian, whose smirk hadn't disappeared from his face in the future: "Biao, a hundred Biao and a good luck!"

(End of this chapter)