Han Cheng was scratching his head. Damn, it’s just a mortise and tenon, but it has to be so tortuous?

This life is unbearable!

He took the charcoal out of the mortise, which had become much deeper and larger, and extinguished the burning charcoal on the mortise wall, and then thought of a solution.

That is, how to ensure that when using charcoal to expand the mortise deeper, the already burned areas above will not be burned by the flames.

Watering?

Water and fire cannot coexist, and the first thing Han Cheng thought of was water.

He used a bowl that the tribes had used at the previous joyous gathering and filled it with half a bowl of water. He dipped his hand in the water to wet the burnt part of the upper half of the mortise, then picked up a piece of charcoal from the fire nearby and put it into the mortise, and then blew air into it.

The moment the charcoal was put into the mortise, a hissing sound was heard, accompanied by white smoke rising. This was because Han Cheng accidentally spilled water underneath when he was getting water.

After experimenting for a while, Han Cheng had to give up this method.

It is not only because it is easy to get the lower part of the mortise wet when applying water, but there is also an important reason. After the charcoal burns for a while, the water on the upper part of the mortise is evaporated and then starts to burn again.

At this time, what needs to be done is to wet the burning part of the upper part of the mortise with water, but this process will not go smoothly. Either the charcoal will burn your hands, or too much water will be used and the charcoal below will be extinguished...

The witch didn't know what the Son of God was busy doing, so when he saw the Son of God finally stop, he came over to ask.

The witch who understood Han Cheng's meaning was very puzzled. He couldn't understand why the Son of God would spend so much effort to make another ladder when there was already a ladder.

In his opinion, the current ladder is very good. It is not only convenient to go up and down, but also easy to make.

Han Cheng had no way of explaining to Wu the great significance of the mortise, because Wu had never seen such a wide variety of wooden tools.

After thinking for a while without any idea, Han Cheng stood up from the ground with a bone blowpipe, stretched his body, and looked at the vibrant tribe with the witch.

The door of the deer pen was open, and the pen was empty. The arrogant Mr. Deer led his harem and offspring out to graze.

Now Han Cheng, Wu and the others are no longer worried about this, because except for the first few times when Uncle Lu was distracted and delayed, he came back very punctually the rest of the time.

Uncle Lu, who went from frugality to luxury, had completely forgotten about Yanshan and other places...

Some of the rabbits in the rabbit pen were squatting at the foot of the wall to bask in the sun, while others were eating grass. Their three-lobed mouths moved back and forth, and they ate without showing their teeth. They looked gentle, but their eating speed was very fast. In a moment, a blade of grass would be completely eaten.

The reproduction rate of rabbits is so terrifying that even though Wu personally dealt with a batch of them in late autumn and early winter last year, the size of the rabbit population has now exceeded its peak last year.

When Wu saw this group of rabbits, his face was full of smiles. Just by looking at his expression, Han Cheng knew that he was missing the wonderful feeling of ending the lives of rabbits with a wooden stick last fall.

The wall is still rising, and more than half of the section on the west side of the gate has been completed.

The vast majority of adults in the tribe are contributing to this major project.

"Baji!"

Shang didn't catch it firmly, and the gray bag filled with mud fell off and hit Junior Brother Sha on the head below.

Junior Brother Sha, whose head and face were covered in mud, cried out in anger.

Shang was explaining something.

Junior Brother Sha looked very funny with a head full of mud, and Han Cheng couldn't help laughing out loud.

Junior Brother Sha and Shang noticed that the Son of God and the witch were looking at them, so they stopped talking and started laughing foolishly.

Han Cheng walked over and motioned for Junior Brother Sha to go and wash.

Got it!

Han Cheng suddenly had an idea and grabbed Junior Brother Sha who was about to leave, and told him to squat down.

Junior Brother Sha was very confused by Han Cheng's actions. He didn't know what the Son of God wanted to do to him, but he still squatted down as he was told.

Han Cheng was not polite at all. He quickly scraped the mud off Junior Brother Sha's head and put it in his hand. He said to Junior Brother Sha, who was extremely moved, "Okay, go wash it."

After saying this, he didn't wait for Junior Brother Sha to reply and ran towards the tree trunk holding the mud.

Junior Brother Sha looked at the Son of God who was happily leaving with the mud in his arms in confusion, and then reached out to touch his muddy head, full of doubts.

Is there something special about me that makes mud turn into treasure when it falls on my head?

Han Cheng was of course delighted because he suddenly thought of a good way to solve this problem.

Han Cheng mixed the mud that he had taken from Junior Brother Sha's head, then scooped some from it and pasted it on the upper part of the mortise.

After the paste was ready, Han Cheng reignited the fire that he wanted to extinguish, selected a piece of charcoal of appropriate size, put it back in, and then blew air with a blowgun.

The witch stood aside with his head tilted, and continued to watch the Son of God's strange behavior.

A smile soon appeared on Han Cheng's face because this method was surprisingly effective.

The mud blocks the direct contact between the wood and the flame, and it is not as troublesome as using water. Just apply the mud and don't worry about the rest.

Without the interference of various things, the progress of burning the mortise was quite fast.

By the evening, four mortise holes appeared on the tree trunk, one thirty centimeters apart.

In addition to being faster than using a stone chisel, another advantage of using fire to burn the mortise is that the mortise is less likely to crack after being burned by flames.

Of course, a stone chisel is also indispensable in the firing of the mortise, because it is used to first chisel out a rough shape at the place where the mortise is needed, and then use charcoal to burn it underneath.

It took Han Cheng four days to use this method to make eight symmetrical mortise and tenon holes on two wooden pillars that would become ladders.

“Beep, beep, beep.”

With the help of Lame, Han Cheng smashed wooden sticks of different lengths and as thick as arms into the mortise in order from bottom to top and from long to short.

The tree stick is slightly thicker than the mortise, which can increase the firmness of the wooden ladder and avoid shoddy construction where the ladder will break when simply lifted by hand.

After nailing all the eight mortise holes on one side of the pillar with wooden sticks, Han Cheng, with the help of Bo and Heiwa, rolled another wooden pillar with mortise holes on the ground half a circle, so that the mortise holes on it were aligned with the eight wooden sticks one by one. Then he asked Bo, who had stronger hands, to use a piece of wood suitable for hitting to hit the outside of the wooden pillar hard.

As Lame hammered, the eight tree sticks entered their corresponding holes little by little...