The train driver in the courtyard

"This is it, Master Chen, mix it according to the ratio."

"Yes!" Master Chen carefully mixed the various materials together with a measuring cup, stirred them, and then heated them with a coal stove.

After the material boils, it gradually turns into an inky black viscous liquid.

Li Aiguo rolled up his sleeves, picked up a spoon, and smeared the sticky liquid on the wooden board.

After waiting for the viscous liquid to cool down, the wooden board was placed in an iron cage.

At this time, there was a mouse chirping in the iron cage, and Li Aiguo put a peanut on the wooden board.

The mouse smelled the food and ran over quickly.

Seeing the black wooden board, the mouse hesitated for a moment.

The mouse always felt that there was something wrong with the wooden board, but it didn't look like a mousetrap, so it didn't seem dangerous.

Finally, lured by the food, the mouse finally let down its guard and ran over.

As soon as the mouse's paw stepped on the wooden board, it got stuck and it struggled for a few times but couldn't get free.

The mouse also panicked and rushed forward two more steps, and this time the fur on its abdomen was also stuck.

The mouse then realized that it had been tricked.

The mouse struggled on the wooden board until it was exhausted, its little eyes filled with tears. It glanced unwillingly at the peanuts that were close at hand, and then at the handsome guy squatting in front of the cage.

"Damn you humans! Damn you! You are so cunning and have such a bad conscience!"

The mouse struggled on the board for more than ten minutes but failed to break free. Instead, its entire body became stuck and it lay on the board unable to move.

Li Aiguo put on thick cotton gloves, opened the cage and took out the wooden board.

Then he called Master Chen to bring a pair of pliers and caught the mouse.

Different from the mouse trap made with phenol resin adhesive.

Because the homemade glue above is not very sticky, mice can be easily caught with iron clamps, which means that the mouse sticky board can be used repeatedly.

Li Aiguo threw the mouse into the barrel, then picked up the wooden board and observed it for a while.

"I guess it can be used five times. This is really a blessing in disguise."

Li Aiguo tested it more than a dozen times in a row, and only after he was sure that the homemade glue was fully capable of sticking to the mouse did he write down the recipe.

"Old Zhang, immediately have the workers produce the new glue according to the formula, and try to make a batch of mouse traps today."

Director Zhang took the formula and said excitedly, "Driver Li, is our project completed?"

He is already anxious to get the big award certificate.

"Don't worry, I found that the board used to catch mice is also effective against flies. It's just that flies are not as strong and they like fishy smells. If we adjust the proportion and formula of the glue, we can also make a board to catch flies."

Upon hearing this, Director Zhang was overjoyed.

Although flies are not as strong as mice, nor as difficult to catch as mice, they are numerous and can fly.

Especially in summer and autumn every year, when the train stops at the platform, flies outside are likely to fly into the carriage.

Every time the carriages were being maintained, the technicians would have to work all night just to catch a fly.

Now that they saw that Li Aiguo was going to develop a fly-catching board, the old masters in the maintenance workshop became excited without waiting for Director Zhang's encouragement.

Although the fly trap is not sticky, it is difficult to attract flies while not making the fishy smell too strong.

Li Aiguo tried several materials but none of them achieved the desired effect.

At this time, there was a noise outside.

"Is Deputy Team Leader Li doing experiments here?" Hearing that it was Zong Xianfeng's voice, Li Aiguo asked Director Zhang to take him into the workshop.

After taking the towel handed over by Master Zhang and wiping his hands, Li Aiguo asked someone to hand Zong Xianfeng a chair. He smiled and asked, "Xianfeng, why are you here?"

Zong Xianfeng looked around.

There were all kinds of simple utensils and mouse cages on the table, and next to the dead mice, there were several workers stirring a bucket of black stuff.

This is more like a simple laboratory than a workshop.

He felt a sigh in his heart. He originally thought that Driver Li was taking a few days off since he was not busy at work, but he didn't expect that he was hiding here to do experiments.

It was the first time for him to see the scene of "rushing to conduct experiments" and he was a little dazed for a moment.

It was not until Li Aiguo asked again that he came to his senses.

"Driver Li, Chen from the signal group found a loophole in your design and is unable to carry out the subsequent signal compilation work. We have no way to solve it, so we can only come to you."

As he spoke, Zong Xianfeng took out his notebook, opened it, and spread it in front of Li Aiguo.

Li Aiguo looked at it carefully for a moment and said, "This is not a loophole. Chen's data did not take into account the sinusoidal fluctuations of the polarity frequency of the electrical signal.

You see, as long as we use a Gaussian normal distribution and specify parameters n, p, their binomial distribution is np mean.

Li Aiguo took out a pen from his jacket pocket and started writing and drawing on his notebook.

As complex formulas appeared one after another, the confusion on Zong Xianfeng's face disappeared bit by bit.

"I didn't expect that this is related to the normal distribution." Zong Xianfeng couldn't help but say as he looked at the final result.

"Mathematics is the foundation of all sciences and is also the most powerful tool. You should learn more from Chen Ziran in the future." Li Aiguo suggested.

"Got it, Driver Li."

Zong Xianfeng gained a lot, put away his notebook and planned to leave.

Seeing the prepared glue in front of Li Aiguo, he asked curiously: "Driver Li, what are you going to do?"

"This is glue for catching mice. I plan to readjust the ratio so that it can attract flies with the greatest effect and make a fly-catching board."

Li Aiguo expressed his thoughts.

Hearing that it was related to the Four Elements, Zong Xianfeng also became interested.

After thinking for a moment, he pointed at the glue and said, "Driver Li, I think the effect of glue is too poor. We should take advantage of the insects' phototropism and use ultraviolet light to attract flies, then set up an electric fence around them to kill the flies."

Isn’t this the fly-killing lamp of later generations?

Li Aiguo nodded and said, "Your idea is good, but it's not practical."

Zong Xianfeng's idea was rejected after much effort. He was a little depressed: "Electricizing flies is effective and simple, so why is it not practical?"

Li Aiguo took out a pen and handed it to Zong Xianfeng: "Write down the materials needed to make the electric fly device."

As an excellent student in the Electrical Engineering Department of Jingcheng University, Zong Xianfeng was not troubled by this kind of work.

“Two full-band ultraviolet lamps, high-voltage power grid, voltage-doubling rectifier circuit”

After writing down a few accessories, Zong Xianfeng muttered quietly: "In order to prevent high voltage electricity from hurting people, it is necessary to install a shell. The shell needs to be anti-electric, and it is best to use a fence-like plastic shell."

After adding the plastic shell, Zong Xianfeng nodded and said, "The fly trap assembled from these parts should be better than the fly trap board, and it can even trap mosquitoes."

Li Aiguo pointed at the list and said, "Calculate the cost."

(End of this chapter)