The cooperation of the two can be regarded as tacit understanding, although the Gunpowder Department is only in the initial stage.

However, Li Chengguang was so strict that Lingdi followed all the instructions of Cheng Chubi and was extremely meticulous.

After all, Cheng Chubi once took an explosive-level firecracker.

After letting him appreciate the destructive power that was so powerful and heinous.

The stone that was blown to pieces by a thing that was no more than **** thick.

As for Li Chengguang, he understood that for his own life and to further his majesty's glorious cause, he had to obey Cheng Chubi's instructions honestly.

Although the Gunpowder Department occupies the entire imperial estate, from the outside, it still looks no different from other ordinary imperial estates.

It's just that there is a cave inside the imperial village, and the Gunpowder Department is located on the island in the center of an artificial lake in the imperial village.

After re-excavation in the early stage, the lake occupies almost half the size of the inner courtyard of the imperial village, which is a full seven or eight acres.

The size of Huxin Island is about one acre. If you want to enter Huxin Island, you have to swim past it naked.

Or just board the only small boat on the island in the lake.

Not only from the perspective of confidentiality work, but also from the perspective of fire safety.

In addition, it is forbidden to bring fire to enter on this island.

It is because I am afraid that someone will ignite the dangerous gunpowder by mistake.

Moreover, the work on the island in the heart of the lake will only be carried out during the day. Once the light is insufficient, all the craftsmen will leave.

Only a squad of elite and loyal troops guarded here.

#####

At this moment, Cheng Chubi and Li Chengguang carefully appreciated the work of the artisans, and then came outside one of the big houses.

In this room, dozens of jars have been placed, and each jar can hold about twenty or thirty catties.

Cheng Chubi walked to the front, opened one of the jars, reached in and picked up some black particles.

The size is a little bigger than millet and slightly smaller than rice. Such grains are very neat and more detailed than the one made by the old Cheng family.

After all, this is for the regular production of military use, and Cheng Chubi is for fun.

"Almost two thousand catties of gunpowder have been produced here, and there are about a thousand lead wires.

They are all about one foot long and about 1.5 cents in thickness. "

Cheng Chubi walked over and saw the oil-paper bag where the word “stroke” was written over there.

After opening one of them, I took out one from the inside. Sure enough, it was made according to Cheng Chubi's idea very standard.

The outermost layer of the lead wire is wrapped with wax, and the wax liquid completely wraps the two ends of the lead wire, which is good for moisture-proof.

In addition, if it is time to make gunpowder weapons, scrape off part of the wax on the fuse to solve the problem.

Cheng Chubi took two or three lead samples and left the lake island with Li Chengguang.

After landing, Cheng Chubi first cut one end of one of the leads, so that people brought a piece of fragrant incense.

In the chick, this lead was burning steadily and firmly, emitting green smoke. After seeing that it had burned halfway, Cheng Chubi threw it towards the lake.

And after the fuse had fallen into the lake for a few blinks, blue smoke still came out.

Cheng Chubi nodded in satisfaction, the quality of this lead, even if it was not as good as the torpedo firecrackers he had played with.

But at least it also has a certain degree of waterproofing. After all, the wax liquid is used for the purpose of preventing moisture and waterproofing.

"Not bad, everyone has worked hard, this kind of lead is very stable."

Cheng Chubi nodded towards Li Chengguang and smiled.

Li Chengguang finally breathed a sigh of relief. He raised his hand to the shore of the lake and explained it as he led the way first.

"Since it fits, it's fine. In addition, the cast iron box that you requested to order last time has already been sampled."

Cheng Chubi walked with him into a house not far from the shore of the lake. Inside, there were a few boxes.

The guard who followed, opened the four boxes, revealing the dark cast iron box inside.

Cheng Chubi picked up one, which was about half a catty heavier, and it looked like a pineapple.

Li Chengguang on the side explained.

"This is a No. 3 cast iron box. The protrusions are about two minutes thick, and the recesses are about one minute thick. It can fit about two or two gunpowder in the middle."

"The No. 2 cast iron box next to it can hold two ounces of gunpowder. There are also No. 15 and No. 20. One can hold one and a half catties, and the other can hold two catties."

Speaking of this, Li Chengguang couldn't help swallowing Xingzi. The bamboo pipe that Cheng Taichang used to play was probably only two or two gunpowder at the most.

Li Chengguang couldn't imagine how much damage the iron box with half a catty and two catties could cause.

"In addition, as you ordered, we also took a batch of bamboo, just over there..."

The guard came to the side and brought a bamboo tube about 20 centimeters long. One end of the bamboo joint was cut off, and the other end was kept.

Cheng Chubi took it for a test, and this bamboo tube was inserted into the No. 3 cast iron box. Just pour gunpowder into the cast iron box.

The handle is fixed, and the lead is inserted into it. This is a Datang version of the bamboo-handled grenade.

In comparison, bamboo is lighter, and it is naturally hollow, which is conducive to the lead device.

Of course, this kind of bamboo-handled grenade can only be thrown out after igniting the fuse by an open flame ~lightnovelpub.net~ after a few quiet sounds.

If you want this thing to hurt the enemy, I'm afraid it will have to be strictly trained.

#####

Cheng Chubi felt that it was absolutely easy for him to throw this thing thirty or fifty meters.

As for the two large iron boxes on the 15th and the 20th, Cheng Chubi naturally used them to make landmines.

Cheng Chubi racked his brains for the mine's ignition device.

In the end, the only thing Cheng Chubi could think of was to get angry with flint.

The flint firing device is not difficult. As an excellent science student, Cheng Chubi is still very good in physics.

Invented a flint ignition device using the simplest copper leaf spring, and installed a trigger-like device.

In this way, a thin thread can be passed and the trigger can be pulled, and the flint ignition device will shoot sparks and ignite the gunpowder.

After all, it is too wasteful to apply the flint ignition device to a cheap and heat-consuming weapon such as a bamboo-handled grenade.

However, using landmines to show the great and wise Emperor of the Tang Dynasty the ability of the King of Gunpowder is still very broad.

After checking that all the materials he requested were ready, Cheng Chubi looked at Li Chengguang.

"Is there a place where I can test these things, preferably a deserted place where people will not worry about them?"

Seeing Cheng Taichang's impatient expression, Li Chengguang shook his head slowly but firmly.

"Your Majesty has said before. If Cheng Taichang feels that it is a match and wants to test the device, he must report it to his Majesty, and he must agree.

"..."