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After coming out of the palace, Li Ang immediately rushed home non-stop, preparing to compile medical school textbooks.

He already had a part-time job in the Imperial Medical Administration, and he had the full right to write textbooks, and he didn't have to worry about Qiu Quan and others' opposition—the previous preparations were not for nothing.

Numerous cases have proved the correctness of anatomy and surgery.

For example, the reason why intravenous injection is chosen for injection is because the drug can flow back to the heart through the venous blood, and then flow through the whole body through the heart to be distributed to the liver and other places.

But arterial blood pressure is bigger, injection is not easy, easy to bleed. And the position of the artery is deep, the wall of the tube is thick, and the lumen is thin, so it is difficult to insert the needle.

Another example is debridement and drainage, blood vessel suturing, trauma suturing, fracture recovery, etc., all of which have relative advantages over previous medical techniques.

The State of Yu is at the peak of its prosperity, and has a high degree of acceptance of new culture and science.

In addition, Li Ang is already an authoritative person, with the aura of the little medicine king, it is not difficult for him to add this textbook or even a subject to the Imperial Medical Office.

‘Now there are wards and medical schools, and the only thing left is for the common people to be able to afford medical treatment. '

Li Ang thought silently, even in a highly developed foreign world, public medical care is still the most difficult social problem.

If all medical expenses are borne by the government, then the pressure is too great,

And if public health care is transformed from a public welfare undertaking to a market-oriented one, dominated by capital, it will inevitably lead to new problems.

For example, expensive medical treatment, excessive medical treatment, tense doctor-patient conflicts and so on.

Li Ang didn't want to see that the hospital system he worked so hard to build turned into a money-making knife for the common people.

'In the final analysis, it is still necessary to increase productivity first, so that the people and the country of Yu can become rich. Otherwise, no matter how good the systems of wards and medical schools are, they are just castles in the air. '

Li Ang, who was writing the textbook, paused,

Tomorrow, let's go to Dr. Su Feng's place to have a look. Tantai Leshan said before that their engine has made another breakthrough.

—————

After a lapse of three months, he returned to the school.

Li Ang listened to Lang Langchen's reading voice from the supervisory building, walked through the tree-lined path with a smile, crossed the covered bridge over the lake, and came to the gate of the patent office.

Before stepping into the patent office, I heard the deafening rumble inside and Su Feng's laughter.

what happened?

Li Ang covered his ears, walked into the door in doubt, and saw that everyone in the hall was wearing furry earmuffs,

On the ground in the middle of the hall, there is a strange-looking mechanical creation that makes loud noises.

The machine is close to the height of half a person, with a dense and complex structure of gears, chains, and belts on the surface.

Through the half-disassembled casing of the device, more complex pistons, connecting rods, and crankshafts can be seen.

"Oh, Risheng, you are here."

Su Feng, who was wearing pink-haired earmuffs, saw Li Ang appearing, stepped forward and moved the joystick of the machine, causing the machine to stop, and said with a smile, "How about this fifth-generation engine?"

"Five generations?"

Li Ang was slightly taken aback, "Iterating so quickly?"

We must know that when he left Chang'an, the patent office was still researching the first generation engine, and within three months, it had already changed to the fifth generation?

"hey-hey."

Su Feng grinned, did not explain anything, took off the pink hair earmuffs on his head and put them on the table, and asked Ou Zhiyuan to wait for the students to reinstall the engine casing on the ground.

He beckoned and took Li Ang to the office.

"In the past three months, I have devoted myself to researching the engine, and I haven't written many letters to you. I'm really sorry. Here."

Su Feng poured a cup of tea with his thoughts, took a few steps forward, came to the middle of the messy office full of books, and stretched out his hand to uncover a piece of tarpaulin.

Crash.

The oilcloth fell to the ground, revealing more than a dozen large and small mechanical creations, each of which has a slightly different shape.

"These are the fruits of this period of time."

Su Feng rubbed his palms, and introduced with great interest: "First of all, the first-generation engine, you remember,

The principle of the first-generation engine is to use wind symbols to attract strong winds and push the pistons forward and backward.

However, most of the wind forces are in conflict with each other inside the wind chamber, and are consumed, resulting in insufficient power.

So we invented the second generation according to your proposal, using water as a substitute.

Burn through the fire talisman to generate heat, heat the water into steam, and use the steam to push the piston.

This kind of efficiency is more than 50% higher than before, but the fire talisman burns too fast, even if it is a talisman of a monk in the cloud patrol realm, it can't last for two quarters of an hour.

Unless it is for a rune master like Tantai Siye to make a move. "

"."

Li Ang leaned forward and carefully observed the second-generation engine, his heart was pounding.

But not to mention, Su Feng is indeed one of the best geniuses in the Yu Kingdom in the past hundred years,

This second-generation engine is no different from the steam engine in the memory of the other world, it only needs to replace the talisman with coal.

Su Feng continued: "Therefore, I invented the third and fourth generation engines.

The former used the ingenious puppet technique of the former Sui Dynasty, which could replace and trigger the talismans by itself, extending the running time of the machine from two hours to one hour.

The latter, on the basis of the former, used double talismans.

There are both fire talismans to provide heat, and water condensate talismans, which draw water from the air, so there is no need to keep adding water to it.

The overall running time has increased to six hours. "

twelve hours? !

Li Ang was slightly stunned. The steam engine that can run non-stop for twelve hours can already meet most of the production needs at this stage, so it can't be praised too much.

"However, it is still too troublesome to maintain, and once it is running, it cannot be stopped, otherwise the whole talisman will be wasted."

The smile on the corner of Su Feng's mouth could not be hidden. Ordinary people, fools and fools could not understand the power of this invention.

On the contrary, it would make him even more happy to be surprised and admired by a smart person of the same level as Li Ang.

"So, there's the fifth-generation engine."

Su Feng smiled and took out a large volume of drawings and handed them to Li Ang.

"This is."

Li Ang looked at the cumbersome and obscure mechanical structure on the drawing, and the runes carved on the metal plate, his face was filled with surprise and astonishment, "Shensha Yunlu?"

"Shh, keep your voice down."

Su Feng quickly waved his hand, and said softly: "The fifth-generation engine largely abandoned ordinary talismans, and instead engraved the god-evil cloud talismans from the pre-Qin period directly on the metal plate.

The technique of talismans originated from shamanism. As the oldest talisman, Shensha Yunlu has a more direct communication with heaven and earth.

It was only because it was difficult to control and easily caused uncertain consequences that it was replaced by the talismans of later generations.

The aura of heaven and earth is not a pool of stagnant water, but will flow and change like the wind.

The gods and evil clouds on the metal plate can absorb the weakest flowing aura of heaven and earth like a funnel to drive the engine to run.

You only need to paste a piece of the most basic talisman to trigger it.

After experiments, a monk listening to the rain can write ten talismans that meet the requirements a day.

The efficiency of the engine activated by each talisman can replace hundreds of laborers and farmers. "

"hiss"

Li Ang took a deep breath, and the shock in his heart was beyond words.

He was not surprised by the output power of the Shensha Yunlu engine. Su Feng's design is to intercept the tiny aura when the aura of heaven and earth flows, which is similar to a wind generator to some extent.

Its power has an upper limit and cannot be compared with monks in the cloud patrolling realm.

However, driven by the aura of heaven and earth

Such a design is completely different from the memory of the foreign world.

From the steam engine, skip the internal combustion engine, gas turbine, jet engine and other stages, and run into the era of "reiki machine\

,"The technology tree is completely developing in another direction.