Yang Qiuchi asked, "Where was the granary guard who caught fire on duty at that time?" ”

"In the second building, next to the granary, there was a little wooden house, where the guards slept at night. There are also people on duty at the gate of the granary yard, but they are only responsible for entering and exiting and guarding the outside. ”

The porter took Yang Qiuchi to the wreckage of the granary to the north, and roughly pointed to the second and third granaries that caught fire at that time, as well as the house where the guards were on duty. Yang Qiuchi stood there touching his chin and pondered for a while, then said to the porter with a smile: "You go back to work first, I want to take a look around here." ”

Yang Qiuchi asked Master Long to reward the porter with two taels of silver, and the porter thanked him happily and left.

Yang Qiuchi walked to the ruins and instructed the guards to carefully remove the top layer of tiles from the ruins of the second granary that the gatehouse said was the first to catch fire, revealing the blackened wood below, first carefully observe the cracks, and then use a knife to scrape open the charcoal on it.

After Yang Qiuchi instructed the guards to carefully clean up the tiles and bricks near the bottom of the log, he squatted down and carefully gouged off the upper layer of ashes, revealing a few unburned pieces of wood, picked one up, looked at it, and nodded.

After inspecting the granary in the north, Yang Qiuchi asked the Jinyi guards to remove the tiles on the ruins of the third granary, and after carefully inspecting them, he continued to inspect the granary ruins in other places, but the inspection speed was faster. By the time all the tests were done, it was already dark.

Song Yun'er and the others didn't dare to disturb Yang Qiuchi, and quietly watched him busy from the side. When he was done, he asked, "Brother, have you found anything?" ”

Yang Qiuchi patted his dirty hands and said, "It's not a fire, it's a deliberate arson!" ”

Yes? All the people were taken aback and deliberately set fire to the relief food? This is a capital offense.

Song Yun'er asked, "Brother, you're not mistaken, right?" ”

"You can't be wrong, you come and see." Yang Qiuchi walked to the ruins of the granary where the fire first started, and pointed to a section of charred wood: "This is where the fire first ignited. ”

"Brother, you are really a god, so many scorched and rotten wood, how do you know that it is burning from here?"

"Do you notice that the wood here is different from anything else?"

Song Yun'er walked to the section of wood and looked at it, it was a big round pillar, which seemed to be a pillar in the granary, which fell down after the granary burned down. She found a small stick and poked the charred log, and looked at Yang Qiuchi suspiciously: "It's no different?" ”

Yang Qiuchi instructed Nangong Xiong to go to the ruins of other granaries in the south and casually picked up a piece of charred black wood, put the two pieces of wood together, and asked, "What now?" Did you find anything? ”

Song Yun'er looked at the two scorched trees carefully, they were covered with blackened cracks, and she couldn't see any difference, so she shook her head.

Yang Qiuchi pointed to the blackened cracks on the surface of the wood and said: "The degree of carbonization on the surface of this log in the granary where the fire first started is relatively shallow--carbonization means that the degree of carbonization of the wood burned into black carbon--the carbonization of the burning of the wood, and the degree of carbonization on the surface of the wood is gradually increased as the fire gradually increases. The wood of this silo is significantly lighter than other silos. From this, it can be judged that this is the point of fire. ”

"The cracks formed by the scorching of the wood around the ignition point are shallow and relatively fine, because when the fire at the ignition point ignited, the fire was relatively small and the fire power was not large, and the log was relatively thick and could not be fully burned, so only the surface was burned. The moisture in the wood is ejected by the heat, which is what forms this shallow, thin crack. As the fire grows, the wood burns stronger, and the cracks form thicker and deeper. ”

"After the fire started, the part under the column was not fully burned because the granary was hollow and the fire burned mainly in the upper part of the roof. When the roof was burned through, the beams were burned, and the heavy tiles that were covered on it collapsed, and because there was no air, the column could no longer burn, so it retained the original appearance of the fire that had been burned at the time of the fire. ”

Yang Qiuchi pointed to the piece of wood that Gong Xiong held over: "This one is different, this is after the fire is very large, the temperature is very high, the fire is very fierce, and it burns very quickly, so it will form such a deep and thick crack." ”

Song Yun'er understood a little: "Brother, you mean, if you find this kind of wood with relatively small and fine cracks, it is the point of fire, right?" ”

"In most cases," Yang Qiuchi said, "especially when there is wind, the fire goes with the wind, and the fire is getting bigger and bigger, and the fire at the fire point is blown by the wind and extends along the direction of the wind, so the combustion degree of combustibles near the initial fire point is relatively lighter than that in the back, and because the fire point and the wood in other places behind it burn to a different degree, so their cracks are different." Based on this, the ignition point can be found. ”

However, when there is no wind, it may be the opposite, the ignition point is due to the continuous burning, the burning time is longer than that in other places, the burning will be more sufficient, and the degree of burning will be stronger, while other places may be extinguished by water in time because of the rescue, and the burning is relatively light. In this case, the rift is the opposite. ”

Song Yun'er nodded with understanding, and said happily: "I know, you just asked the concierge if there was any wind and what the wind direction was, just to judge the fire point." ”

"Yes." Yang Qiuchi smiled, "Actually, after analyzing the difference between the fire point and the burning traces of other fire points for a long time, it is not as obvious as a more intuitive evidence to explain the problem." ”

"What evidence?" Song Yun'er said curiously.

Yang Qiuchi pointed to a half-collapsed granary in the north: "Have you noticed, this granary was not burned, but demolished." ”

Everyone looked, and sure enough, although most of the granary was blackened, the northern half of the granary was still relatively intact. I didn't know what was going on, and looked at Yang Qiuchi questioningly.

Yang Qiuchi said: "This remaining granary is the first granary counted from the north, which is in the north, and as analyzed just now, the first to catch fire was the second granary, but the north wind blew that night, and the wind was very strong, and the fire spread along the wind and would not burn back against the wind." ”

"In addition, the distance between the two granaries is more than ten steps, which is still relatively far, so the granary upwind has not been burned except for being smoked by fire. The rest of the granaries downwind were burned down. This is the best proof of the ignition point. ”

Yang Qiuchi walked to the bottom of the log in the second granary, pointed to the carbon wood that had not been completely burned in the few sections just now, and said, "Have you paid attention to these small logs that have not been burned?" This is the most important evidence of arson. ”

Song Yun'er and the others looked at Yang Qiuchi puzzled, how could the scorched wood that had not been burned for a few minutes prove that it was set on fire?

Yang Qiuchi said: "Think about it, how can there be such a small pile of wood on the corner of the granary house? What is it used for? Yang Qiuchi picked up one, scraped off the coke part on it, revealing the true color of the wood inside, and then handed it to the little maid Yuechan: "You must have burned a fire and cooked in the countryside when you were a child, look at it, what kind of wood is this?" ”

Yuechan took it with both hands, turned it over and looked at it carefully: "Young master, this is a fine pine tree, and there is grease on it." ”

"What for?"

"When you make a fire and cook, it's best to use this kind of dry pine wood with a lot of fat to start a fire."

Song Yuner and the others are all from rich backgrounds, and they have almost never been in the kitchen, so they are not familiar with this kind of firewood used to cook rice, and after listening to Yuechan's introduction, it suddenly dawned on her, in a place where fireworks are strictly prohibited in the granary, there is such a small pile of fire-causing things, what is it not used to set fire? It seems that this is the ignition point of deliberate arson.

After listening to Yang Qiuchi's analysis, Master Jin's eyes suddenly widened, he nodded in admiration, remembered something, and then asked curiously: "My lord, what is your purpose in looking for this fire point?" ”

Song Yun'er hurriedly said, "Hey! I don't know, of course, it's a matter of whether it's a fire or a misfire -- am I right? Elder brother. ”

"Clever!" Yang Qiuchi praised, "Yun'er is right, find the fire point, and according to the situation of the fire point, you can find the real cause of the fire." ”

Song Yun'er tilted her head a little proudly, but when she saw the blackened remains of the granary, she frowned and asked, "Brother, such a messy thing, I see that my head is big, how did you find out that this was deliberately set on fire?" ”

"Didn't I say that? Any crime leaves a mark! Yang Qiuchi walked forward more than a dozen steps, pointed to the ground and said: "The gatehouse said that the location of the room where the guards were on duty was here, since it was determined that the guards had burned down the granary due to a fire for heating, but this room was in the south, and the fire point we determined just now was more than ten steps away from the north. ”

Song Yun'er thought for a while: "Could it be that they moved the stove there?" ”

"It's possible," Yang Qiuchi said, "but the pillar we saw just now was located in a corner of the granary, and the ruins showed that the rest of the place was an open space. It is also more than ten steps away from another granary, who will not warm up in the room in the cold winter and run outside to the corner of the granary to warm up? It doesn't make sense. ”

Song Yun'er smiled: "There are also cases that don't conform to common sense." ”

"But there are more cases that make sense! Solving a case is to put the most likely situation as the first object of investigation, and when the common sense situation is ruled out, it is often the truth that does not conform to common sense. ”

Song Yun'er nodded and said, "Brother, you make a lot of sense. ”

(To be continued)