There are three conditions that must be met for flame burning, first, there must be combustibles, there are wooden houses, and there are firewood; Second, there must be a certain temperature, that is, the ignition point, which we have not found yet, and we cannot judge whether the ignition point has been reached; Third, there should be combustible substances, all doors and windows should be closed, if the fire is not large, after the oxygen is not enough to support the combustion, it should be extinguished after a period of time. ”

Yin Xiaolian frowned and looked at her: "How do you know such a strange thing?" ”

"Junior high school science."

Yin Xiaolian: "......"

What the hell is this?

Xu Shu was meaningful: "What you can't learn in hundreds of years." ”

Yin Xiaolian: "You!! ”

Xu Shu spread her hands, she was telling the truth, it is true that science and technology still need to be developed for hundreds of thousands of years before Qi Ying can reach the level of the 21st century.

"Anyway, you just need to know that there are no windows here, and the doors are tightly closed, and the air in the firewood room is generally difficult to circulate, so how can it affect the whole house?"

There are no windows in the firewood room, and the door is tied when I come, which means that the door of the firewood room has not been opened until the end...

Xu Shu asked: "Do you remember what kind of wind was blowing that day?" ”

Yin Xiaolian nodded.

"A westerly wind."

The weather in the cold spring is still relatively cold, so the west wind has been blowing, which they asked at the beginning.

"This is strange, if it is a west wind, it should not spread the fire to the entire Qin Mansion, after all, the firewood house is to the east of the other houses in the Qin Mansion."

"We also asked the people in the Qin Mansion before, and they said that it was because someone also set a fire on the other side of the mansion, so the two sides burned up, and finally they were caught in the middle and all of them burned."

Xu Shu shook his head: "That's not right." ”

Yin Xiaolian: "What's wrong?" ”

"Look," Xu Shu squatted on the ground and drew a picture with a tree branch, "it was a west wind that night, and according to what you said, in the second half of the night, the wind was still very strong, especially this structure of the Qin Mansion, which could completely constitute a small narrow pipe, under the blessing of the narrow pipe effect, the west wind blowing to the Qin Mansion must be very strong, under the blowing of such a strong west wind, even if Zhang Zhai set fire on both sides of the Qin Mansion, under the blowing of the west wind, the trajectory of the flame burning should be from west to east." ”

"We just looked at it casually and weren't sure how the fire was spreading."

Xu Shu smiled, patted the soil on his clothes, and stood up from the ground: "It depends on the pictures drawn by those officials." ”

Yin Xiaolian glanced at her in disbelief: "Just a few pictures, what do you want to see?" ”

Xu Shu: "Roar, don't underestimate whether a few pictures are good or not, that's an important clue to handle the case." ”

There are some masters of painting in the former company, but in this era, they will not be regarded as gods.

They are only good at depiction, not freehand, so the paintings they paint are not called art.

But Xu Shu was very satisfied.

They drew the structure of the house clearly, and basically used white drawing techniques, which were combined with sketches.

Although this is very inefficient, it can at least allow them to figure out the structure of the entire Qin Mansion.

Xu Shu took them to find a room in the Zhang Mansion next door as a temporary office.

When the people in Zhang's house heard that they were still investigating the case, they immediately tidied up a big house and came out.

"Imperial Guard, you must return the innocence of our master."

Xu Shu comforted Mrs. Zhang, "Don't worry, if he is really innocent, we won't wronged him." ”

(End of chapter)