Open an aircraft carrier to fight against Japan

Lin Yuan looked at the elderly policeman and asked, "Are you Captain Li?"

Li Butou replied: "It's the villain."

Lin Yuan asked: "Tell me, how did the fire start? Did someone set the fire?"

Li Butou said: "My lord, in my opinion, this fire was started by myself, not someone set it on fire."

At this moment, Shen Wanqing said from the side: "I think there is a 90.00% chance that this fire was started by someone."

Li Butou glanced at Shen Wanqing, and said coldly: "Which family are you from? Go home soon, is this the place where you mess around?"

It turned out that as soon as Shen Wanqing arrived at the scene of the fire, she looked around, so there was a distance between Lin Yuan and Li Butou, so Li Butou didn't expect that she came with Lin Yuan. Women in this era have no status, and Shen Wanqing has long been in various places. The occasion is used to being ignored, so I didn't get angry.

Lin Yuan hurriedly said, "Captain Li, we came together." Then he turned his head to Shen Wanqing and asked, "Wanqing, why do you say that the fire was started by someone?"

Shen Wanqing said flatly, "Intuition."

Li Butou saw that Lin Yuan was very close to this woman named "Wan Qing", and knew that the relationship between the two was unusual, so he said with a smile: "Miss, I have offended you so much, forgive me." Shen Wanqing smiled slightly, Said: "It's okay, since Catcher Li said that the fire started by himself, let's analyze it for us."

Li Butou turned sideways, made a gesture of invitation, and said: "My lord, please go to the fire site with me. I will explain it to you in detail. Please rest assured, my lord. This warehouse is very strong and there is no danger of it being overturned after the fire." "Lin Yuan was also very relieved of the warehouse he commanded to build, so he followed Li Butou into the warehouse. There were gray and white embers everywhere, some of which were still smoking, and the ceiling and pillars had been blackened by the smoke. The head catcher said: "Since I was 15 years old and followed my father to handle the first case, I have been in the police business for 30 years, and I have also solved many fire cases."

Catcher Li pointed to the wall opposite them, and said, "Look, my lord, the ceiling over there is the most severely burned. I sent a capable officer to go up and check it. The steel frame there has been burnt out of shape, so I conclude that the fire is the It started from the cotton clothes under the ceiling, and the fire traveled around and ignited the surrounding cotton clothes. The cotton is extremely flammable, so this fire burned all the cotton clothes in the entire warehouse."

Shen Wanqing asked: "How can a good cotton coat burn?"

Li Butou replied: "I have handled similar cases before. The cotton is the best for keeping warm. There is no window to ventilate the wall where the fire started, so the heat accumulated in it cannot be dissipated, so it burns by itself."

Shen Wanqing frowned and asked: "There is no high-temperature heat source, where does the heat of the cotton come from?"

Lin Yuan said: "Wan Qing, what he said is true. Cotton will absorb moisture in the air. This is an exothermic process. When cotton is piled together, the heat cannot be dissipated, so it will spontaneously ignite. It’s raining all day and the air humidity is relatively high, so it’s not uncommon for cotton to ignite spontaneously.”

Shen Wanqing smiled and said, "Could it be that someone lit the fire there?"

Li Butou said: "Impossible. The villain had previously asked the warehouse guard and several porters in detail about the piling up of cotton clothes here. Look, my lord, the warehouse is more than ten meters high. The cotton around the fire point The pile was eight meters long, and the porters had to use rack trucks to remove the top coat, and there were coats all around the fire site, so people couldn’t get in, so why not just light the coats outside if they intentionally set fire?”

Li Butou said again: "Even if someone has moved the rack cart and threw the fire into it, it is impossible. First, the rack cart is extremely heavy, and it takes five or six strong men to push it. Second, the rack cart is very loud when it is pushed." Big, people outside can hear it clearly, there are patrolling soldiers outside the warehouse, basically they can come here once in a quarter of an hour, so it is impossible for someone to set fire."

Lin Yuan nodded, looked at the warehouse, and said, "In my opinion, what Wan Qing said is correct, this fire was indeed started by someone."

Catcher Li was stunned for a moment, and said, "I would like to ask your lord for advice."

Lin Yuan pointed to the window next to him, and said, "Look, there are two windows here. The windows are always open for ventilation, and they are just opposite to the point of fire you mentioned." Catcher Li couldn't think of Lin Yuan If he wanted to say something, he could only listen while frowning. Lin Yuan pointed to the window and said, "Look, it's already burned black."

Li Butou said with a blank face: "The villain is stupid, please show me clearly."

Lin Yuan patted the wall under the window with his hands, and said, "This is where the fire started, and the fire started from here."

Li Butou said: "My lord, my villain, in the past 30 years, dozens of arson cases have been solved. Among the fire scenes, the place where the fire started has always been the most severely burned, but this place is more burnt than the wall over there." Much lighter."

Lin Yuan said: "Let me explain to you why this is the fire point. You should know, the hot air after the fire." Lin Yuan was worried that Catcher Li would not understand the meaning of the hot air, so he changed his words and said, "The heat generated by the fire The smoke is very light, so go up, there is a window above the fire point, the cold wind from outside blows in, it will blow the hot smoke towards the opposite wall, and when it reaches the opposite wall, it will fall again, so it ignites the cotton underneath. ""So there will be no evidence of a fire burning through here on the ground. The person who set the fire placed inflammables here and ignited it. There are very few inflammables, so the cotton under the opposite wall was ignited and then extinguished. , When the fire is all extinguished, it will leave us with the illusion that there is a fire point.”

Li Butou said: "In that case, why doesn't the hot smoke descend at the front and ignite the cotton at the front?"

Lin Yuan said: "This question is very good. While explaining this question, it can also explain why the ceiling above the opposite wall was the most severely burned. After the cold wind outside the window meets the hot smoke inside, the cold wind blows and the hot smoke blows Above, this layer of cold air separates the cotton from the hot smoke. This is a process of fighting between hot and cold. When they reach the junction of the opposite wall and the ceiling, the cold air is exhausted and the hot smoke wins. So... "

After Lin Yuan finished speaking, he pointed to the ceiling of the opposite wall and said, "The hot smoke kept piling up there, and the fire became stronger after the cotton underneath was ignited, so it became the most severely burned place."

What Lin Yuan said was exactly the issue of the secondary fire point that should be considered when judging the fire point in modern fire science. How could Catcher Li know this? Everything makes sense, but I don’t know who set the fire?” Lin Yuan frowned, and said, “That’s right, who set the fire, he must first enter the warehouse door, so he must have a key. Could it be that the warehouse guard lost the key?"

Catcher Li said: "Even if the arsonist has the key, he can't come in and set the fire."

Lin Yuan asked, "Why?"

Li Butou said: "We asked specifically when we came. The door of the warehouse is made of iron and is extremely heavy. Even if there is a key, it takes five or six strong men to push it open. The sound is loud, if you come in through the door, you will definitely be found."

Shen Wanqing said suddenly: "I know how they got in."