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Chapter 304 It¡¯s not that simple

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    As soon as the alert was lifted in the West Campus, the students knew that the master was coming out.  He quickly put down what he was doing and ran over to greet him.

    When Zhao Hao walked out of the room, he saw Liu Yang and Zhao lined up neatly, bowing and shouting: "Master, thank you for your hard work."

    Before they finished speaking, they all turned the bamboo tubes in their hands.  Amidst the banging sound, colorful confetti suddenly flew out and landed all over Zhao Hao's head and body.

    "Uh" Zhao Hao was startled, and for a moment he felt like he was filming a short video with a local flavor.  He couldn't help but laugh and curse: "Whose fucking idea was this?"

    "Senior Brother!" Everyone pointed at Wang Wuyang.

    Wang Wuyang hurriedly smiled and said: "The main reason is that I haven't seen Master for a long time, so I wanted to do a simple ceremony to express my feelings."

    As he said that, he quickly helped Zhao Hao take off the ribbon.

    "What is this?" Zhao Hao took the bamboo tube from his hand and looked at it. He saw that it was very similar to the firecrackers at weddings in later generations.  But in his memory, those crackers were filled with compressed gas.

    The disciples¡¯ eyes turned to Zhao Shizhen again.

    "This is the spray tube I made. I hollowed out the joints of the bamboo tube, stuffed paper rolls on the top, and filled the bottom with gunpowder. The bottom can be rotated, and is embedded with flint and fire steel. The gunpowder will be ignited with one rotation." Zhao Shizhen laughed.  Said: "With a bang, the paper inside will be sprayed out."

    "You're not afraid of blowing yourself up!" Zhao Hao patted his eldest nephew on the back of his head, feeling happy in his heart.  After all, this child's thinking already has the shadow of a flintlock gun

    He is indeed a natural arms expert.

    Zhao Hao secretly praised, threw the bamboo tube to the eldest disciple, and while walking to the west courtyard, asked the disciples, have they finished preparing for the exam?

    The elder brother flattered and replied: "Master, according to your instructions, the disciples have focused on practicing big questions this month. Each of them has written a hundred articles. It can be said that they are very well prepared."

    Zhao Hao¡¯s mouth twitched when he heard this.  He secretly thought, your master only took one question, so he felt that he was well prepared.

    He has always felt a little sorry for the students because he was too cautious and did not allow them to enjoy the happiness of 100% accuracy in answering the questions.

    Therefore, before accompanying Mr. Zhao for retreat, Zhao Hao had almost made it clear that the examiner for this subject was Bachelor Li Chunfang.

    Li Chunfang is cautious as an official and cherishes his reputation extremely. Such a person will never rely on odd questions to show his knowledge.

    He is already the number one scholar and the second-ranked bachelor, is there any need to show off?

    So it can be inferred from this that today¡¯s test is a big question, which should be very reasonable.

    I hope that students can waste less time on interception and matching questions and improve their already good results

    ??~~

    After the master and apprentice had a reunion dinner, Zhao Hao sent those who were about to take the exam back to the room to stay.

    It¡¯s time, even if you don¡¯t do anything and just sleep quietly, it¡¯s much better than talking here and talking.

    The remaining three who were not taking exams stayed with the teacher on the kang to talk.

    "How's that thing going?" Zhao Hao asked without any hope.

    During this time, he often heard banging explosions. If it weren't for the low risk factor of the Newcomen machine, he would have asked Gao Wu to stop the two people's experiments.

    Zhao Shizhen and Zhang Jian were already feeling guilty, but when Zhao Hao asked this question, they immediately withered.  The latter burst into tears.

    "Master, we have failed to live up to your expectations, we have failed"

    "Oh, are you always having trouble?" Zhao Hao took a sip of tea, looking very understanding.

    "As expected, Master guessed it right away." The two nodded like pecking at rice.

    "Let's go and take a look." Zhao Hao got up and got off the kang, and his disciple quickly helped him put on his warm boots.

    When the master and apprentice came to the experimental room in the back yard, the first thing that caught Zhao Hao's eyes was a Newcomen machine model made of bamboo and an iron kettle.

    "Is this thing easy to use?" Zhao Hao asked with interest.

    "This is easy to use." Zhao Shizhen responded, quickly took a piece of homemade coal lotus root the size of a mooncake, lit it and put it into a bowl to use as fuel.  He did not forget to say to Zhao Hao with admiration:

    "Uncle's fantastic idea is indeed correct!"

    "This is science." Zhao Hao corrected.

    "Yes, a fantastic idea based on science." Despite Zhang Jian's lack of confidence, he is very skilled in flattering.

    As he spoke, he filled the bamboo tube that served as a water tank with water.  The water flows along the water pipe made of thin bamboo poles, first sprays into the cylinder made of moso bamboo, and then pours into the cylinder.?The cylinder is tightly connected to the iron kettle.

    Then use coal lotus root to heat the kettle.  After it boils, the steam rushes onto the thick bamboo used as the cylinder.  The increasing steam pushes up the piston of the cylinder, which drives the lever at the other end to lower its head.

    When the piston reaches the top, Zhang Jian releases the water again.  Cold water is sprayed into the cylinder, and the steam inside cools down, condenses, and falls back into the pot. The vacuum formed sucks the piston down again, and the lever at the other end naturally raises its head again.

    Then the steam is reheated to push up the piston; water is released to cool it and the piston retracts, and the cycle continues.  As the steam filled the air, the lever was like a drilling machine from later generations, constantly raising its head and nodding.

    It can be seen that the two of them have thoroughly understood the simple principles of the Newcomen machine and perfectly restored the model. They are worthy of the name of genius.

    After the model was successfully demonstrated, Zhao Hao turned his attention to the five or six cracked tin cans placed on the table.

    "We asked the blacksmith to cast this." Zhao Shizhen said with shame: "I originally planned to make a full-scale model of the same material as a real automatic water pump. But it didn't take long before the iron can exploded.  Another exploded as soon as I used it."

    Zhao Hao nodded, picked up an iron can and saw that it was already rusty after only a few days

    He explained to the two of them: "This is a material problem. Because the cylinder is integrated with the boiler, it will expand synchronously with the boiler when heated. When cold water is injected, the inner layer of the cylinder will shrink rapidly. But the outer wall is still expanding.  state, it will be subject to strong pulling force on the inner wall. However, the cylinder cast with pig iron is very hard and has extremely poor plasticity. If this is repeated dozens or hundreds of times, the uneven texture will crack. "

    "I heard that the guns of the army are easy to explode. Is this the reason?" Zhao Shouzheng was indeed worthy of the name of a weapons master, and he immediately thought of an idea.

    "That's right, so to avoid exploding the barrel, you have to use better materials or change the method of making the barrel." Zhao Hao smiled, put down the iron can and said, "I don't blame you. It's just my luck.  I thought I might be able to make do with it.¡±

    "It seems that we have to solve the material problem first." He sighed self-deprecatingly, gave up the idea of ????and said: "Let's put this matter aside for the time being. You should learn to lay a solid foundation first, and then we can think about it slowly.  Method."

    Seeing Zhao Hao about to leave the laboratory, Zhao Shizhen and Zhang Jian looked at each other. The former whispered: "Uncle, it's not all without gain. Sixth Brother was inspired to build a water pumping device"

    "Oh?" Zhao Hao couldn't help but smile: "Where is it?"

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