As soon as the next day dawned, all the clansmen of the Huangqiu tribe gathered around the ravine, and they looked curiously at Shen Nong, Cang and the others fiddling with a huge wooden assembly that was two people high, and their eyes were full of doubts.

"Be gentle, be careful not to drop this thing. Shen Nong held on to the corner of the wood assembly and moved it very cautiously.

I saw that this wood combination was actually an enlarged version of the barbecue grill, three pieces of wood were tied together by black rattan ropes, standing firmly on the ground in a three-legged shape, and there was such a wooden tripod on each side of the ravine, which seemed to be holding something.

In the hands of Shen Nong and the others who carried it, they jointly carried a thick wooden pillar that was three meters long, and thirty pulleys of the kind that Shen Nong made yesterday were tied to the wooden pillar, which looked very spectacular.

And these pulleys are a little different from the rough product that Shen Nong made yesterday.

I saw that under the fixed pulley tied to the wooden pillar, each hung a movable pulley, and the two pulleys were connected by a black rattan rope, and one end of the black rattan rope that surrounded the moving pulley came from the fixed pulley, and the other end was connected to the big wooden pillar, but I don't know what mystery is hidden in it.

Shen Nong and his entourage carried the big wooden pillar across the ravine, and the Huangqiu people standing at the end of the ravine immediately hugged the big wooden pillar, and then together with Shen Nong and others standing at this end, the big wooden pillar was accurately placed on the two wooden tripods, so that the big wooden pillar stood firmly in place.

"Alright. Shen Nong clapped his palms excitedly, and said to Cang and the others: "Move that thing over, we're going to start installing." ”

The people nodded, and immediately turned around and ran away, and it wasn't long before they came running with four wooden dishes about the size of a bathtub.

At the edges of these vessels were small holes that could be used to thread ropes, apparently to tie them together with something.

"Wu, I've brought something. ”

"Hmm. Shen Nong nodded and said, "Let's put it up now." ”

There are 30 fixed pulleys tied to the wooden column, and each fixed pulley is equipped with a movable pulley, that is, there are a total of 30 fixed pulleys and 30 movable pulleys.

Cang and the others pulled the thirty movable pulleys out of the ravine, and then tied them with the four wooden vessels one by one with black rattan ropes, and after doing all this, everyone pushed the wooden vessels into the ravine, allowing them to sway in mid-air.

"Let's start!" Shen Nong said with a wave of his hand when he saw that everything was ready.

Click!

Standing on both sides of the ravine, the Huangqiu people reached out and grabbed a protruding wooden grip on the wooden post, only to see them work together to rotate the handle counterclockwise, and suddenly the thirty pulley sets rotated in unison, and there was a piercing grinding sound.

And under the gaze of everyone on both sides of the ravine, the four wooden vessels were slowly descending towards the bottom of the ravine.

"The pulley block was started and the initial success was achieved. Seeing this scene, Shen Nong couldn't help but say.

Yesterday, after he taught Cang and others how to make pulleys, he worked all night with the four of them to complete such a large pulley set.

When the ordinary pulley pulls the heavy object, the user needs to pull one end of the rope with his hand, so it is inevitable that there will be potential safety hazards, for example, if the user can't pull the rope or something happens to let go of the rope, the person standing at the bottom of the ravine is dangerous, and it is not sure what accident will happen.

Therefore, in order to ensure the safety of the clansmen's lives, Shen Nong deliberately drove the black rattan rope that originally needed to be pulled by the user into the wooden pillar, and then made a simple device similar to the rural well twisting the handle to draw water and attached it to the wooden pillar, which can not only ensure the safety of the clansmen and prevent accidents, but also make the clansmen who control the pulling and releasing pulley more effortless.

Theoretically, this pulley group should be able to pull the weight of thirty people's backs, but in practice, it must not reach this value, after all, the weight pulled by thirty pulley sets must be borne by the wooden column, that is to say, the weight bearing limit of the wooden column is the upper limit of how many heavy objects can be pulled by this oversized pulley.

When the four wooden vessels reached the bottom of the ravine, the Huangqiu people who had been waiting below for a long time quickly began to move, and they used bone shovels to scoop up the soil in the ravines and throw them into the wooden bowls.

Soon the four wooden vessels were filled with dirt, and the weight was estimated to be about ten people's backs.

"You can pull it up!" Flying Shell shouted as he lowered his bone shovel and looked up into the ravine.

"Pull!" Shen Nong shouted.

Suddenly, the Huangqiu people who controlled the wooden grip began to turn the handle clockwise, only to hear the sound of 'click', the black rattan rope began to retract, and with the help of the rotation of the pulley block, the four wooden dishes were quickly pulled up.

It was still very easy for thirty pulleys to pull four wooden dishes, and there was no obstacle at all, and soon the four wooden dishes were pulled to the feet of everyone beside the ravine.

Several clansmen hurriedly went up to pour out all the soil in the wooden bowl, and then put the wooden dish back into the ravine, watching the pulley group once again drive the wooden dish towards the bottom of the ravine, Shen Nong and Cang and the others were also relieved.

In this way, the combination of 30 pulleys is also considered a success, and the capacity of the four wooden dishes can be at least 10 times that of ordinary wooden barrels, so that the efficiency of soil discharge in the gully can be greatly improved, and the implementation progress of the fence construction plan can also be greatly shortened.

An oversized pulley is controlled by six people, three on the left and three on the left and right, who turn the wooden grip and then also pour out the dirt brought up by the wooden dish.

Judging from the current number of people in the Huangqiu tribe, it is completely possible to add a super-large pulley set to be controlled and used by the idle tribesmen, so that the efficiency of soil drainage can be doubled.

So Shen Nong said to Cang: "The four of you will work together to make this pulley set today, so that there will be more soil at that time." ”

Naturally, Cang and the others would not refuse Shen Nong's proposal, so they nodded and agreed.

With this oversized pulley, the speed of soil discharge at the bottom of the gully can be said to have been qualitatively improved, and the quantity has changed, and it didn't take long for the soil in this gully to be transported outside the gully, and two small mounds were piled up on both sides of the ditch.

These two small mounds are undoubtedly piled up next to the ravine, which is undoubtedly a very unsightly picture, so Shen Nong said to the: "When the sun sets, you take a few clansmen to carry this soil to the side of the water storage tank with a cart and pile it up, I will use it in the future." ”

"Okay. "Peck the bones answered.