Hit the limestone knife with another stone to have the limestone knife sliced into the bamboo.

And this gray stone knife is almost just a stone chip, not sharp.

Only the Gui stone knife was added with a bamboo handle by Ah He, and such a handle was cut by her using a very badly shaped Gui stone piece, and she cut it slowly and repeatedly.

For this reason, the two opened five long bamboos before they got a long bamboo strip that met their hearts.

And the dry bamboo in the shade is more useful than the green bamboo, and Ah He can completely understand it, so he is reluctant to smash it more, so he puts away the rest of the bamboo.

Look at those bamboo slices again, because there is no fire to roast the burrs after cracking, it will be very prickly, and you can't always use rabbit skin to tie it, after all, rabbit skin is good, linen cloth is good, for Ah, it is a more precious thing, how can it be used indiscriminately?

They must be used to keep warm and protect the body from accidental breakage of the skin.

Therefore, these bamboo chips must be deburred.

But with a Guishi knife, Ah Ah was reluctant.

Fortunately, Amachi has a way.

Because bamboo itself is very hard, in the opinion of Ah, who pays great attention to the hardness of various items, it is a good tool.

She brought a piece of waste bamboo, used rabbit skin as a glove, let Zhang Jingtao hold one for Zhang Jingtao, and took one herself, using the hard side of the waste bamboo strip to scrape on the relatively soft side of the long bamboo strip with burrs to remove the burrs.

In the case that the bamboo skin of the waste bamboo strips is very hard, but the scraped bamboo belly is softer, this is still very useful, and Zhang Jingtao did not find any problems with doing so.

After a long period of slow processing, the long bamboo strips are ready to use.

After that, Ah He and he used a stone knife to open the bamboo belly, and used a limestone knife to continuously cut and deep process on the opening, so as to cut out a section of flat pole for making bows on this long bamboo strip.

Of course, there is a way to break bamboo pieces, and that is to use the power of leverage to break them in the cracks of the stone.

Therefore, the Chinese began to play levers from the flood famine, and for this reason, Chinese children have often played rockers since ancient times.

The word 'warped' represents the use of leverage.

Even Zhang Jingtao knows that there are some Chinese words that involve the application of leverage.

Therefore, the principle of leverage was never discovered by Aki's evil way, because the word warp has long existed.

However, the direct breaking method can easily hurt the bamboo body and break the bamboo body.

For this reason, Ah Da must cut a large part of the bamboo belly, and then use the breaking method to not easily hurt the bamboo body.

So, obviously, in the breaking method, of course, the larger the gap cut on the bamboo belly, the less likely it is to break the bamboo body, so that Ah Hao decided that it would be better to cut it all.

Because she thinks that the longbow needs to be extremely strong, and it must not crack at all.

And the ancients like Ah Ha have always been very patient with this kind of high-tech work of making tools, which is far beyond the patience of modern people.

Even a little progress, in Ah's opinion, is a miraculous success.

And Ah, instead of making a bow, he plans to use one with Zhang Jingtao.

For this reason, Zhang Jingtao never thought that it would take him a day to cut a bamboo strip that was only a flat width into several sections.

But Ah Yu didn't feel slow at all, and every time he was resting, he saw that the gap on the bamboo belly was a little bigger, and he was excited, and he discussed with Zhang Jingtao how good this method of cutting bamboo with a stone knife was, and also found that the stone knife with a wavy mouth was better to use.

"Yes, that's great." Zhang Jingtao burst into tears, thinking that there were a lot of ores in this ancient Kongqiu area, and he doubted that he would not be able to help but refine a sword and slash at the bamboo bar.

In particular, because Zhang Jingtao didn't know Ah He's idea at first, when Ah Ah went to get lunch, he took the initiative to cut the bamboo first, and the first one was placed at one meter, and when she got it delicious, she came over in the afternoon, and the cut had already cut through the bamboo wall.

As a result, after Ah said it was too short, he had to change his head and recut it.

But the bow in Ah's imagination is very long, definitely a longbow.

Because her plan is to make a bow, she can put one end of the bow directly on the ground and then pull the other end to use it.

Zhang Jingtao thought about it, this bamboo flat shoulder was a bit too wide, and for him, it was not light, but because he couldn't imagine how powerful this longbow made of bamboo pieces alone could be, he didn't suggest that the bow body be made thinner.

In short, this bow body is at least 2.5 meters long.

Even if Zhang Jingtao is enough for him to use on the ground, it can indeed be very labor-saving, and when drawing the bow, Ah He will use herringbone steps.

It was also Ah Ah who used a small herringbone step, and after stretching one hand forward, the height of the hand obtained was 1.25 meters, and she planned to put her hand in the middle of the bow body, so that she would think that the bow should be made of 2.5 meters.

For this reason, Zhang Jingtao found that the reason why 2.5 meters is one zhang is this way.

This zhang seems to be as high as 2.5 meters, but at the beginning, it only refers to a woman's, so a woman's spouse is also called a husband's, which is the meaning of the husband's.

So, while Zhang Jingtao was speechless, there was a short section of two meters long on the scene, with a wall opening on the middle bamboo belly.

And in this regard, Zhang Jingtao still didn't find out what was wrong with this.

It wasn't until the next day, when the two of them used stones to grind the two ends of the two bow bodies and prepared to further process the side of the flat shoulders, that the problem finally appeared.

This deep processing does not mean gently scraping off the burrs on the side of the flat shoulder.

But when he tried the elasticity of the flat shoulder, he found that if the flat arm was made into a bow, then, when pulling the bowstring, it was not to let the bamboo skin of the bamboo face the outside, but to face the inner side, that is, the side of the person, so that a single piece of straight bamboo would have enough resilience.

Therefore, judging from the cross-section of the flat shoulder, this smile is curved by thin rectangular lines, and the two sides of the corners of the mouth are square.

Because of this square shape, when the inside of the bamboo is bent outward, the cross-section of the curved section appears to be a triangle protruding from the outside of the cut.

It's like holding a triangular strip of wood and bending one corner facing the outside.

Therefore, when such a bamboo bow is pulled apart, the bamboo fibers at the tip of the triangular peak formed on the side will bend and crack outward.

Although the cracks produced by this cracking are very small, only small horizontal lines are formed on the sides of the bamboo pieces.

But Ah He has split the bamboo, thinking that sooner or later the small mouth will become a big mouth, of course this is not good.