Just when Zhao Zheng was in a daze with a pile of firewood and grass, Feng Youcai suddenly came over and said to Zhao Zheng: "Master, I don't need you to worry about eating anymore, if the apprentice can't even settle this little thing, then he is not qualified to worship under the master again!" ”

Zhao Zheng smiled slightly when he heard this: "The problem of eating is naturally not worried about you, but this matter of carbon production suddenly feels a little tricky." ”

Feng Youcai heard Zhao Zheng say this, and immediately puzzled: "Foolish, we stole this food, and we have to go to the pharmacy tonight to touch some nitrate and sulfur stones, but why can't we go to the stove at ordinary home to touch some back?" Besides, most people have to clean up this thing regularly, even if we ask for it in person, it will be as much as we want, why should Master bother so much? ”

Zhao Zheng smiled dumbly when he heard this: "My good apprentice, if it is really so easy, will it be so stupid to be a teacher?" Alas...... It is said that what you said is quite reasonable, but ......" Zhao Zheng touched the sticks that were still a little damp and continued: "A few days ago, it rained heavily, and many houses had rain leaks, and the carbon in the stove had already been damp and could not be used, understand?" ”

When Feng Youcai heard Zhao Zheng say this, he was immediately a little embarrassed, and then arched his hand and said, "Master, the apprentice is abrupt again!" ”

Zhao Zheng looked at Feng Youcai with great satisfaction and exclaimed: "It's right to be a teacher, although you are silent on weekdays, you can speak outright when you should say it, which is very commendable!" The people who used to call you 'Feng nerd' were blind people! ”

Feng Youcai saw that Zhao Zheng gave him such a high evaluation, and his heart naturally burst into ecstasy, "Master, since this is the case, what are you worried about?" ”

"Alas......"

Zhao Zheng said a little helplessly: "As a teacher, I suddenly realized that it seems not easy to burn charcoal in batches in the city, and the real difficulty is not in the grabbing and method of firing materials, but in how to disperse the smoke during the firing process, after all, there is suddenly billowing smoke in the city late at night, which will definitely attract the officers and soldiers patrolling the city!" If we get that step of the field, we won't be able to move even if that full warehouse doesn't want to......"

"If that's the case......" Feng Youcai pondered for a moment, and suddenly slapped his thigh and said excitedly: "By the way, Master, do you remember the hole you dug with your own hands last time?" ”

"What...... What hole? You're talking about smokeless stoves! Zhao Zheng said with a black face.

"Yes, yes, it's a smokeless hole! Master, you can use that to make carbon! Feng Youcai said excitedly.

"But that stove is too small!" Zhao Zheng said helplessly.

Feng Youcai heard Zhao Zheng say this, and then looked up to the sky in a very broken down and sighed: "Master, you are really smart and confused for a while!" The apprentice took nine disciples, one person with one stove, one stove and one house, and didn't they all work together overnight? ”

"Shhh...... Ay! Counter ......"

Zhao Zheng suddenly realized when he heard Feng Youcai say this, and then he kept beating his head while smiling bitterly, "Alas...... This brain is really getting more and more useless! ”

After making up his mind, Zhao Zheng simply asked Feng Youcai to gather the remaining nine people and began his first real lecture in another world, and the content of the lecture was how to dig a field smokeless stove!

The field smokeless stove sounded lofty, but in fact, it was not very difficult to dig up, and it only took ten minutes for ten disciples to disperse and find the neighboring houses by themselves, and dug them up with short knives. Since it was still difficult for them to dig a hole with a short knife, when everyone dug their respective smokeless stoves, it was already sunset, but fortunately, Zhao Zheng had already "worshipped" Shen Lang, so there was no need to rush home to deal with it.

Looking at the smokeless stove dug by the disciples, Zhao Zheng would nod slightly with satisfaction everywhere he went, after all, it was not easy to successfully dig it out the first time.

After Zhao Zheng gathered ten people, he instructed: "Don't put those broken wood slags in again, you must pay attention to the heat, and take them out after the whole wood is charred!" After hearing this, Feng Youcai and the others couldn't wait to split up, and after a while, the fire in the smokeless stove was blazing, and the firewood crackled.

Zhao Zheng knew in his heart that the things burned out in this way were actually far from carbon in the real sense, but due to limited conditions, Zhao Zheng could only be a dead horse as a live horse doctor, and at this time he didn't expect the gunpowder made this time to be better than the previous one.

The fire burned until midnight, and when each of the ten men came out of their stoves, each of them was covered in ashes. "Yes, you all have night clothes tonight, and it's convenient to go out and touch the sulfur later!" Against the backdrop of the fire in the stove, everyone looked at each other, only to think that each other's appearance was very funny, and then laughed at each other.

Not to mention that Feng Youcai took the only nine remaining apprentices to the pharmacy at night, but said that after Zhao Zheng smashed the burned carbon rods one by one, Feng Youcai and the others ran back with a big bag on their backs.

"Master, huhu...... Do you think that's enough? Feng Youcai gasped.

Zhao Zheng got up and touched the nitrate and sulfur ore in his pocket, which had been ground into powder, and then grinned the most playfully: "What's more?" It's just more than enough! I'm afraid that tomorrow the owner of the pharmacy will cry and call his mother! ”

Everyone laughed when they heard the words, Zhao Zheng sniffled, and when he smelled a faint oily smell, he knew that they had filled their stomachs by the way, and their hearts were relaxed.

Just as Zhao Zheng was about to start construction, Feng Youcai suddenly took out a greasy fat chicken from his arms, "Master, you must be hungry too, this is the apprentices' filial piety to you!" ”

Looking at the fat chicken in Feng Youcai's hand, Zhao Zheng really wanted to pounce on it and nibble a few big bites at once, but reason told him that he couldn't do it. Slightly swallowing the saliva that had already flooded in his mouth back into his stomach, Zhao Zheng took the fat chicken with a slight tremble, and then walked straight towards Shen Lang. A handful of chickens were stuffed into the arms of Shen Lang, who was wandering with Zhou Gong.

The fragrance of the fat chicken instantly pulled Shen Lang back from Zhou Gong's side, and without waiting to open his eyes, Shen Lang took a bite directly after the taste, and then opened his eyes slightly with satisfaction.

"Yikes! Belch...... Belch...... Master, apprentice ......" Shen Lang saw Zhao Zheng squinting his eyes and looking at himself, and looked down at the chicken in his hand to know that he was out of shape, and then said vaguely.

Seeing this, Zhao Zheng hurriedly waved his hand and smiled: "It's not in the way, it's not in the way, you can eat it quickly!" For the teacher, hurry up and teach them how to prepare gunpowder, it's not too early! ”

When Shen Lang heard this, he threw the chicken to his side, and said anxiously: "Master, the apprentice also wants to learn!" ”

Seeing this, Zhao Zheng shook speechlessly and said: "Don't be anxious, this thing is very simple, you will understand it as soon as you hear it!" Then, Zhao Zheng turned around and said to everyone: "This gunpowder pays attention to one nitrate, two sulfur and three charcoal, to put it bluntly, these three things are fully mixed together according to the ratio of one, two, three. Note that during the doping process, it must be ensured that there are no foreign substances in the doped powder, and secondly, be sure to stay away from open flames! ”

"Yes!"

Feng Youcai and the others responded very seriously when they heard Zhao Zheng say this, and then began to manufacture black powder in batches, and an hour later, the large clay jar that Zhao Zheng carried last time was filled, and when the sky was white, everyone had prepared five large vats of extremely inferior purity black powder......