"There are so many bows and arrows in the army that it is impossible to poison every bow and arrow."

The more the old master spoke, the more relaxed he became, and he even joked, "Haha, if there is really so much poison, it is better to put it directly in the enemy's water source, then the effect is estimated to be better." ”

"Really." Lu Zhi decided to be a good compliment and asked the master to say as much as possible.

"This poisons the bow and arrow, and it also requires the characteristics of the poison." When the master said this, his eyes were shining, and it is estimated that he studied these when he was young.

"The first thing is to ensure that the poison can be attached to the arrow (not a clerical error, the arrow is mostly used in colloquial language), the previous arrow clusters are not poisoned, it is best to use venom, and it must be the kind with long-term medicinal properties."

The old master paused, "Well, after this arrow cluster is built, we don't know when it will be used, you say?" ”

"Indeed, when the war will start, it is not for us to decide." The old master said that Lu Zhi understood, which means that this venom must not be volatile easily, or it will soon become invalid.

This alone reflects the importance of the master's experience, and before he said it, Lu Zhi didn't think of this.

The old master is happy, he hasn't said so much for a long time, "This is not the end, the poison must also be highly poisonous, and if you get a little bit of the arrow on it, you have to be able to take people's lives." ”

"See blood seal your throat?" Lu Zhi continued, from a scientific point of view, the mechanism of action of this poison must also interact with blood, otherwise it is useless.

…………

"That's probably all there is to the poison arrow." The old master put away the cluster of arrows, changed another one and handed it to Lu Zhi, "This one is more common, it sends signals." ”

Lu Zhi nodded, he knew this thing, according to his understanding, it should be called "Rattling Tail Arrow", and Da Yue called it "Mingdi".

This thing was invented by the Han clan of the Jin Kingdom, this Han clan is very powerful, and the skill of making bows and crossbows is recognized as unparalleled in the world.

The front end of the Ming Di has a sharp blade, and the back has a collar, and the upper end of the collar has a gourd-shaped object, and there are 4 or 3 small holes on it, and with the help of a strong bow, it can make a piercing sound when flying.

It can be used to signal or use as an alarm, and there are copper, bone and bamboo, and the master gave him a bamboo, which you can understand as a whistle.

Later, the master introduced the process of making arrow clusters, which is probably the simplest casting, that is, using stones to make molds, and then pouring melted copper water into them.

The cluster of arrows cast in this way, after molding, the fine craftsman may also polish it a little, well, it can be used without polishing.

Arrow clusters are consumables, and they are extremely expensive, so such a simple and fast process is undoubtedly very suitable.

Of course, this Lu Zhi himself will, but after hearing this, he still feels that he has benefited a lot.

I finally understood why Lu Jian wanted to introduce such a person to him, this master is a capable person, and his research on arrow clusters is not shallow, so he should be regarded as a meritorious old craftsman.

And according to Lu Zhi's guess, the poison groove on the poison arrow is not the master's invention, but the practicality is not high, and the old man is embarrassed to say it.

…………

Lu Mansion, ancestral hall.

Lu Zhi asked the next person, and Lu Jian was incense again, so he went to the ancestral hall to find someone.

"Coming back so soon? Uh, no, I mean...... What does the little ancestor think of this person? Lu Jian skillfully handed over three incense sticks, Lu Zhi bowed, and then Lu Jian inserted them into the incense burner on his behalf.

"It's a talent, it's very experienced, but it's a little old." Lu Zhi knelt down on the futon, put his hands together and bowed, "It is suitable to be a master to cultivate newcomers, if the Ordnance Bureau does not want it, then receive it from our Tiangong." ”

Lu Jian nodded, he introduced the master to Lu Zhi also had this idea, the master was an old man who followed his father, and now that he is old, he should have a good home.

"By the way, can the craftsmen of the Ordnance Bureau come to our Heavenly Workshop?" The issue of confidentiality is still very serious.

"Something." Lu Jian knelt on the futon, slightly behind Lu Zhi, "But it's not a big problem." ”

"Okay, you can do it." Lu Zhi is actually a little relieved, Lu Jian seems to have grown.

…………

Lu Zhi's room, he began to stay up late to draw again.

Based on what he saw and heard today, Lu Zhi found that there were many types of arrow clusters in Da Yue, and the shape was also somewhat arbitrary.

"Shouldn't we make a standard cluster of arrows?" Lu Zhi pinched the brush and muttered quietly.

System: "!! ”

It's really rare that the host didn't even think about being lazy! Give it a thumbs up!

In fact, as long as some attributes are attached to the arrow cluster, it can completely exceed the requirements of the imperial court, so looking at it, Lu Zhi is indeed diligent.

"First of all, these ones with small wings can't do it, it's too much of a ride."

Lu Zhi recalled the arrow clusters he had seen at the master's place, those with three wings, two wings, two wings and two tails, and three wings and three tails, which were directly eliminated by him.

"Then there are only triangular and quadrangular ones left." Lu Zhi simply drew a sketch and started to make a long-lost ...... Force analysis.

Uh, well, in fact, he also knows that it must be the best triangular without force analysis, and drawing a picture is just to recall the past.

"It is best to have three ridges of almost the same length and arc, which is more in line with the aerodynamic shape of modern bullets, and does not affect the use in the case of wind."

Lu Zhi muttered, "Then you need to measure precisely, but this is Dayue, where did you get the instrument?" ”

"Yes, I can do it myself." Lu Zhijue didn't sleep anymore and went straight to the small workshop at home.

System: "......"

I always feel that the host is silly and cute, and the consumables such as arrow clusters are not suitable for being too delicate, after all, refinement means that it takes more time, strictly speaking, some gains outweigh the losses.

Lu Zhi actually understands, but while he has enough time, why not do the best he can?

…………

In the small workshop, Lu Zhi was cutting jade, and he was about to carve a vernier caliper.

Vernier caliper is a measuring tool for measuring length, inner and outer diameter, and depth, and is composed of two parts: the main ruler and the vernier attached to the main ruler that can slide.

There are two sets of movable measuring jaws on the main ruler and vernier caliper, which are the inner measuring claw and the outer measuring claw, the inner measuring claw is usually used to measure the inner diameter, and the outer measuring claw is usually used to measure the length and outer diameter.

Without much explanation, this thing is very useful for making small parts, and can be used when you want to make arrow clusters.

Besides, when Lu Zhi first arrived at the Ordnance Bureau workshop, he didn't make a small part, or the one where the craftsmen and masters tested his skills.

That thing is called a mechanical wood, and it is a regular project of the Ordnance Bureau, and there are hard tasks every month, and the demand is not small.

Lu Zhi pondered, the production requirements of the machine wood are strict, and the scrap rate is very high, and once there is this vernier caliper, it should be able to solve a large part of the problem.