After saying hello to the eldest grandson, she went straight home with these sulfur saltpeters in her angry eyes.

As soon as I returned home, I happened to meet the Liu brothers who were about to go out. Zhang Yunwen stopped the two of them: "Big brother and second brother, are you going to Zheng Tu's house?" ”

The Liu brothers smiled innocently: "Yes, third, our brother has nothing to do at home, he is so bored that he just goes out to do something, and by the way, he can earn a little money to drink!" ”

Zhang Yunwen said angrily: "Alas, you guys also look down on your third child too much!" I can mix from a soldier to a general, so don't I have a little money to support you? ”

The Liu brothers sneered: "That's not to look down on the third brother, but, uh, it's ......" I couldn't think of anything after holding it for a long time.

Zhang Yunwen sighed and said, "Big brother and second brother, I still want to see you as you are!" In this way, then don't go to Zheng Tu's place, if you want to kill pigs to make money, the third brother will open a shop for you! ”

As soon as these words came out, the Liu brothers suddenly looked at me, I looked at you, stared at each other, and finally said in unison: "What kind of butcher shop to open, if you want to open a restaurant brothel!" ”

As soon as he heard this, Zhang Yunwen was suddenly a little sluggish, and the two brothers didn't need to be comforted at all.

The words were already out, Zhang Yunwen had no choice but to say: "Okay, I'll open a tavern over there in Lan Kwai Fong, and you will go there to sit in the town in the future, if you want to drink, just drink!" ”

"Wow, third child, you're amazing!"

Zhang Yunwen was speechless and watched the two brothers take out a jar of wine, drinking without any image.

"Second brother, hurry up and drink all this bad wine, we will have a tavern soon, drink as much wine as you want at that time!"

"Woo woo......" The sound of drinking came,

……

Zhang Yunwen returned to his room, collected the sulfur saltpeter, and took out a small bag each.

"Hmm, what's the recipe? It seems to be 75% of saltpeter, 10% of sulfur, 15% of charcoal, yes, that's it! ”

At this time, I realized that I didn't have a weighing instrument at all, did I really have to hold a big scale to weigh these two things?

Suddenly, Zhang Yunwen remembered the nickname used when selling medicinal materials in the medicinal herb shop, and that thing was probably used to weigh gunpowder!

At the moment, I ran to a medicinal herb shop, spent a lot of money to buy a small scale, and bought a few catties of black charcoal by the way.

When he returned home, he instructed all his subordinates not to enter his small courtyard, so he made black powder by himself. In fact, he knows that even if the black powder is made now, I am afraid it will be difficult to come in handy, because Zhang Yunwen will never disclose the secret of the gunpowder before the Xuanwumen Change, if the prince and his party are allowed to master the gunpowder, who can know if the Xuanwumen Incident in history will change?

Now what he wants to do is nothing more than to make two small bombs out to play, and if he encounters any emergencies, he will have something to defend himself.

The three ingredients are carefully weighed, and the rest of the process is to mix the three things into black powder. However, it is also this process that is the most difficult. Sulfur saltpeter needs to be ground into powder, and of course, the finer the better!

Zhang Yunwen didn't make gunpowder once or twice, I think at the beginning, he was known as a "blasting expert", and he used explosives superbly.

After grinding, wipe the sweat from your cheeks and ignore the wet clothes on your back, and carefully mix the three ingredients evenly.

It's finally done.

Looking at the pair of black powder in front of him, Zhang Yunwen knew that as long as this thing was ignited, it could blow up this room.

Picking up the pu fan fan and fanning the wind, Zhang Yunwen suddenly thought, what is this extra pound of gunpowder to do? A grenade is still a bomb, or a landmine.

In the end, Zhang Yunwen decided to use the gunpowder to make a grenade. Considering that there are still a lot of impurities in these sulfur saltpeter, maybe the power of the explosion is not as great as he expected, Zhang Yunwen also increased the weight, and this pound of gunpowder was only used to make two grenades.

Speaking of grenades, he remembered the iron casing and ignition system of the grenade. The iron shell is easy to do, and it is necessary to ask the blacksmith Zhou, who made stirrups and horseshoes, to make a few, but this ignition system is very complicated.

Or just make a fuse. Zhang Yunwen just thought about it, and then thought again, I am also a dignified reconnaissance battalion commander, known as a blasting expert, if I can't even get an ignition system, it would be too embarrassing!

Thinking about it, he picked up a brush and drew a schematic diagram of the time-delay ignition device on a blank piece of paper, and repeatedly scrutinized each part to see what could be replaced with today's productivity.

In this way, for several days, Zhang Yunwen always went to the Qin Palace's mansion every day to sign in, and then told Li Yu two jokes in "The Legend of Xiaolin Guangji", except for meat jokes, of course. Then I went to Zuiyun Tower to learn about the information of various places, and the rest of the time was to buy a lot of various materials and make ignition devices to see which one had the best effect.

Finally, after five days of hard work, reeds were used instead of springs, and flint was used as the firing pin and fire cap of the ignition system, and finally, a rudimentary time-delay ignition device was produced.

Zhang Yunwen excitedly carefully packed the gunpowder into the ordered pineapple shell, then carefully connected the ignition device, and finally sealed it with wax, and a grenade belonging to the Tang Dynasty was made.

However, contrary to expectations, because some of the gunpowder was used as a fuse, and that fuse was consumed in the experiments, in the end, the remaining amount of black powder was only enough to make a grenade.

Sneaking to the outskirts of Chang'an, Zhang Yunwen took out the grenade, pulled the pull ring, threw it out with a "whoosh-" sound, and then hid behind a tree.

only heard a loud sound of "boom-", and Zhang Yunwen smelled the familiar smell of gunpowder again.

When I stepped forward, I saw that the turf on the ground was scraped open, leaving only the earthy yellow soil. In these four weeks, some small saplings were directly broken or fell to the other side by impact, and the trunks of large trees were more or less inserted with shrapnel flying around.

Well, it's good! Jang Yunwen feels good about himself.

Sneaking back to Chang'an City, Zhang Yunwen ordered twenty grenade shells from the blacksmith that week, and then returned home to make more than twenty ignition devices.

It took nearly five more days to finish the twenty grenades.

Zhang Yunwen, who was done, was suddenly relieved, and he could finally rest well.

However, before he could rest, a guy from the Drunken Cloud Building suddenly appeared at the door of his house with a few urns of good wine, saying that he had come to deliver wine to General Zhang. Zhang Yunwen happily accepted it, and the Liu brothers immediately smiled happily.

In the name of gratitude, Zhang Yunwen and the guy returned to Zuiyun Building. Although he didn't know why Xu Chensong was in such a hurry to find himself, he knew that something big must have happened.

Sure enough, as soon as he arrived at Zuiyun Tower, the shopkeeper directly beckoned Zhang Yunwen to go up to the third floor, and the first sentence was: "Dean, the bird you want has been found!" ”

(Ask for a collection!!) ）