Fang Yizhi was thrown to the Department of Public Works to serve as Song Yingxing's assistant.

Song Yingxing was also inspired by Zhao Han in physics, but he was too busy with official business, and his interest in studying physics was not as active as Fang Yizhi.

The two of them should be able to collide with each other and create some sparks.

Regarding physics, Zhao Han remembers junior high school knowledge at most, but he has long forgotten most of high school physics, and he can't remember a single high school physics formula.

He can only enlighten and impart the methodology of the study of natural sciences.

Fang Yizhi is in a state of madness, studying mechanics all day and night. In less than half a month, the product will be autonomous, and let the craftsman make it.

Song Yingxing quit, saying that Fang Yizhi, the assistant, was not good, and he was distracted by all kinds of desertions during work hours.

Zhao Han simply set up special institutions, namely the Hanlin Academy, the School of Mathematics, and the Institute of Physics.

This Hanlin Academy, not the Hanlin Academy.

The Hanlin Academy of the Ming Dynasty belongs to the preparatory organ of the central high-level cadres.

Zhao Han's Hanlin Academy is purely an academic institution.

The study of the theory of Datong, the compilation of Datong Zhengyin, the determination of standard characters and dictionaries in the future, and even the re-compilation of primary and secondary school textbooks, or the compilation of the "History of the Ming Dynasty" after the death of the Ming Dynasty, all these tasks were handed over to the Hanlin Academy for implementation.

Officials of the Hanlin Academy are not allowed to participate in politics, let alone transfer to official positions with real power!

The three academies of Hanlin, mathematics and physics are temporarily under the direct jurisdiction of Zhao Han.

The Institute of Physics is the most cold, and there is only Fang Yizhi alone.

Zhao Han ordered him to select twenty students, and while helping Fang Yizhi do experiments, he followed Fang Yizhi to study. These students are not paid, but they are fed and sheltered.

There are so many houses in the family of Xu Guogong in Nanjing, and they will be allocated to various institutions in the future. For example, Wanzhuyuan is arranged to be the site of the Institute of Physics, and the environment is absolutely elegant to ensure the physical and mental happiness of the researchers.

"The town!"

Another day, Fang Yizhi took out the schematic diagram, pointed to the drawing and said: "The object itself remains immobile because the force is balanced. Take this inkstone as an example, it has its own power to fall, and the desktop gives it upward lifting force. When the lifting force and gravity are the same, the inkstone can remain still. Just like a person stepping on a mire, it will sink down due to gravity. The deep footprints are subject to human gravity. When the mire is trampled, the lifting force of the ground counteracts the gravity, and the person stands still. ”

Zhao Han smiled and asked, "So, what do you derive from the (law)?" ”

Fang Yizhi replied: "All things are quiet. Any object must be stationary when it is subjected to a balancing force, or when it is not subject to an external force. ”

Zhao Han crumpled Fang Yizhi's drawings into a ball and threw them out at random: "What forces have this paper ball suffered?" ”

Fang Yizhi redrew the picture, thought about it carefully, and kept writing the force: "It is thrown by the general town, as well as its own gravity. When these two forces are combined, the ball of paper falls forward. ”

"Really?"

Zhao Han took out another piece of paper, did not crumple it into a paper ball, unfolded it and threw it, and asked, "These two pieces of paper are equal in weight and weight, and the force I throw is about the same." Why is one thrown far away and the other thrown close? ”

Fang thought hard with wisdom.

Zhao Han picked up a book, used it as a fan, and fanned it towards Fang Yizhi: "Do you feel it?" ”

"Wind." Fang Yizhi replied.

Zhao Han asked, "Your hair moves with the wind, what force is there?" ”

Fang Yizhi's eyes widened: "Wind is pneumatic, and qi is a real thing!" ”

Fang Yizhi's understanding of wind in "Physics Knowledge" is: Yin and Yang are driven by pneumatics, and ventilation can be styled.

Zhao Han smiled approvingly.

Fang Yizhi added to the drawings again, and said: "The paper ball still has the resistance of qi, and when the resistance is balanced with the throwing force of the general town, the paper ball will no longer ...... That's not right! ”

From Newton's first principle to Newton's second principle, Fang Yizhi was instantly confused, and he felt that this problem was very complicated.

Zhao Han smiled: "I don't want this for the time being." If my desk is extremely smooth and there is no resistance, will the inkstone stop when I push it? ”

Fang Yizhi thought seriously, shook his head and said, "No, the inkstone will keep moving forward." ”

"Then your previous conclusion is wrong, that things do not remain still, but remain in their original state." Zhao Han said.

Fang Yizhi nodded: "Indeed." ”

Zhao Han said with a smile: "How about this kind of representation of things, how about calling it 'inertia'? Consistency. ”

"Yes."

Fang Yizhi felt that this problem could continue to be studied deeply, and said: "Zong Zhen, I will leave first, and go to sort out the cause." ”

"Go ahead." Zhao Han felt very relieved.

Waiting for Fang Yizhi to walk to the door, Zhao Han suddenly shouted: "If you make any more achievements, you can invite people from the School of Mathematics and let them go to the Physics Academy to have a look." Perhaps, there can be a few more like-minded people. ”

"Yes!" Fang Yizhi retired.

Zhao Han leaned back in his chair and closed his eyes to recuperate, physics research finally has a practitioner, and he believes that lighting the fire will definitely spread.

It's also time to go to Nanjing, after the summer harvest, we will send troops to Jianghuai, and the location of Ji'an is really a bit off.

The General Military Mansion also had to be changed, not to mention establishing himself as the king, at least it had to be upgraded to the Governor's Office, and Zhao Han decided to call himself "the generalissimo of the world's soldiers and horses".

This position has a fight with Zhu Houzhao's "Governor, Military Affairs, Mighty General, and Chief Military Officer"!

……

Chongzhen's thirteen years are destined to be extraordinary.

The Manchu army, which had surrounded Jinzhou for half a year, swaggered and immigrated to Tuntian outside the city.

Zu Dashou has always adhered to Jinzhou City, and there is no appearance of surrender.

How could he have surrendered?

The ancestral family has a great career in Liaodong, and it can be said that it is the emperor of Liaodong, and surrendering means losing his basic plate.

Unless, the ammunition is exhausted, and there is no way to live.

Next to Jinzhou City, there are Songshan Fort garrisoned by Wu Sangui and Xingshan Fort garrisoned by Liu Zhouzhi.

Wu Sangui is now panicking, he only has 3,000 soldiers in his hands, and Zu Dashou has been surrounded under his nose for half a year. has been asking the court for reinforcements, but the result is that not only did the court reinforcements not arrive, but the military salary was directly gone.

In the entire Liaodong, Chongzhen asked people to send 100,000 taels of silver.

It's useless to make a salary, the court really has no money.

The military generals of Liaodong suddenly became loyal and patriotic. Alas, if you don't pay the army, you won't pay it, the war still has to be fought, and it is impossible to surrender.

As long as there is the slightest hope of being a soil emperor, who the wants to be a dog for the Manchus?

Liaodong has long allowed the opening of regimental training, and Wu Sangui's father, Wu Xiang, was serving as the chief soldier of Ningyuan's regimental training at this time.

There is more than one general soldier in Ningyuan's regiment, and Jin Guofeng is also in this position, and Wu Sangui is applying for this position. Anyway, these Liaodong generals, in the face of the arrogance of the Tartars, are all paying their own money to recruit troops to fight.

Once surrendered, they were nothing.

They don't take the Ming Emperor in their eyes, and they also don't want to take refuge in the Manchus, and their own interests always come first.

Just when Jinzhou was besieged for half a year, Subandai (Mongol), who was stationed at the Xingshan Beacon Tower, secretly wrote a letter to the Manchu Qing Dynasty.

The Manchu general Jierharang only led 1,500 people to respond, and Wu Sangui, Liu Zhouzhi, and Dai Ming found out the news and joined forces of 7,000 troops to intercept it. After wanting to win this battle, Hui Shi and Ning Yuan's soldiers attacked the Qing army besieging Jinzhou.

7,000 Liaodong soldiers, raided 1,500 Qing troops, and were defeated and returned.

At the same time, the Mongol Nuomuqi, who was stationed in the outer city of Jinzhou, quietly wrote a letter to surrender to the Manchus.

When Zu Dashou learned the news, he led his troops to kill from the inner city to the outer city, and killed the Manchu generals Mu Husa, Jue Luo Lantai, and Hongke. Outnumbered, Zu Dashou retreated to the inner city, and the Qing army occupied the outer city of Jinzhou.

The outer city has been occupied, and Zu Dashou still sticks to the inner city, and it looks like he can hold it for at least another half a year.

Huang Taiji was panicked instead, he didn't dare to consume food like this anymore, and simply continued to send troops to attack Songshan and Xingshan.

Wu Sangui only had 4,000 soldiers left, half of whom were newly recruited Tuanyong, who were besieged to the death in Songshan Fort.

……

Over there in Hubei.

Xiangyang mutinied due to lack of pay, and the soldiers killed the governor and the general soldiers, and took refuge in Zhang Xianzhong.

Zhang Xianzhong then waved his army to surround Yunyang, and the territory south of the Yangtze River in Huguang was left, leaving Yunyang Mansion not Zhang Xianzhong's territory.

Henan direction.

Yang Guozhu, Wang Pu, Zuo Liangyu, and Meng Ruhu are still encircling and suppressing Li Zicheng, saying that they are encircling and suppressing the rogues, but more often than not, they are grabbing grain. The imperial court can't pay the army, and they will starve to death if they don't grab food!

Not to mention the grain grabbing by the officers and soldiers and the rogues, Henan is in another big drought this year!

The people of Henan really couldn't survive, and Yuan Shizhong, Li Jiyu, Liu Yuchi, Zhu Chengju and others rebelled. didn't even bother to take one of the bandits, and directly used his real name to rebel, Zhu Chengju was even a member of the Ming clan.

The whole of Henan is full of anti-thieves in all directions.

These rebels are all led by Li Zicheng, but in fact, they don't listen to the announcement. They captured the stockades of the big landlords, and one by one they built up villages to protect themselves, and occasionally attacked each other.

Unable to suppress the thieves anymore, Zuo Liangyu left Henan again and went to Shandong to rob grain, recruiting displaced people as soldiers by the way.

Li Zicheng called on the leaders of all walks of life to join forces to counterattack, Yang Guozhu and Wang Pu were defeated and fled, and died when they broke through like a tiger.

Henan has since become a territory for anti-thieves, and Li Zicheng led his troops back to Shanxi, intending to take Beijing directly after taking Shanxi!

The situation is changing so fast that it is dazzling to watch.

There is only one real reason: Zhao Han occupied Jiangnan, the salt lords fought in Jianghuai, and the imperial court could not collect taxes and pay military salaries.

……

Far away in Europe.

The bourgeois revolution in Britain officially began this year.

In fact, it has nothing to do with the bourgeoisie, it is just a by-product of the Thirty Years' War.

Britain has been fighting for decades, and the royal family has gone bankrupt. So he frantically collected taxes, forced the nobles, merchants, and peasants to death, and the king also took the initiative to provoke religious contradictions, and the operation led to a rebellion of the whole country!

The Thirty Years' War was still going on in Asia at this time.

Realizing that their army was not good, the Netherlands paid for a few thousand Swedish mercenaries this year. Sail all the way from Europe to attack Portugal's eastern colonies, with the main targets being Goa, Ceylon, and Malacca.

No sooner had the Portuguese fleet transported 500 Indian horses, Wari horses, when the Dutch began to lay siege to Goa.

In the future, if Zhao Han wants to continue to buy horses, it is estimated that he will have to pay heavy taxes to the Dutch, and Malacca will definitely be taken away by the Netherlands.

April.

500 Indian horses arrived in Shanghai, all of them strong and vigorous!

It's a pity that more than 30 horses have died in long-distance transportation by sea.

Zhao Han came to Nanjing again, the General Military Mansion was renamed the Governor's Mansion, and the whole team moved to Nanjing City.

Everyone knows what Zhao Han is going to do next.

Northern expedition!

Northern expedition!