Under the bright light, the full face of the stone statue was clearly visible. The tall martial general crossed his waist with his left hand, and held a sword in his right hand and stared at the corridor in front of the Hades Temple. Under the light, everyone also found that Professor Chen felt that the problem was not just a blind feeling, but a real danger: General Wu's belt and boots were full of holes, and they should also be equipped with arrows or something.

Feng Weiguo looked at these holes and asked fearfully, "Professor Chen, this stone statue is also a machine crossbow inside, right?" Since it will be triggered only by the error of the nine-house chart, what is the principle of its triggering? ”

After Professor Chen arranged for Zhang Gong to dismantle the mechanism of the Jiugong diagram below, seeing the hungry eyes of everyone after they gathered him in a circle, Professor Chen smiled and explained to everyone: "Actually, this crossbow mechanism is the same, it is no different from the one at the door, but it is just a different trigger method, that is a direct trigger, and this is a selective trigger." If the password is correct, the triggers of these traps will be locked, and vice versa. ”

"But how is this locked? After all, it is necessary to judge whether it is right or not. ”

"This is simple, in fact, these nine slate are the password disk, the first slate is the trigger button, if the password is wrong, then the stone is the button that triggers the mechanism, if it is right, then the stone becomes the button that the stone door drops, the point is not the button itself, but the password lock under the nine-palace diagram."

"Professor Chen, I don't understand this, since you mean that the right password button is the key to open the tunnel, and if it is wrong, it is the trigger of the mechanism, so what is its principle?"

"Come, I'll draw a sketch on the ground for you to see," After speaking, Professor Chen squatted down, took a piece of chalk from his backpack and drew it on the ground, and said while drawing: "You see now, this is the approximate composition of the combination lock, the initial state is closed, although it is 9 grids, on the surface it is 9 buttons, in fact, the real use is 4, that is, 3, 8, 4 and any one of the mistakes on our side, if we press 3, 8, 4 in turn, then this is the key to open the stone door on both sides, At the same time, the following device will be used to insure the mechanism trigger, so it will not trigger the mechanism when it is correct, and in case of pressing the number combination in the wrong order, then the password lock is still closed, and the trigger is the mechanism, to put it bluntly, this password is the choice of the mechanism and the stone door, and there will be a lever to resist the mechanism for insurance, and at the same time, under the principle of the lever, the bolt that has been holding the stone door has been removed, and the result is that the stone door falls, if the password is wrong, the result is known. ”

"Oh, I see, then Professor Chen, how did such a small combination lock do it in ancient times?"

"Haha, you will be surprised when this combination lock is removed, it is not a gadget from the Ming and Qing dynasties, and I guess it is not wood or bamboo, but also copper."

"Oh, so is their basic combination the same as the modern one?"

"This, you ask Zhang Gong, he is an expert, I can't tell you the details, haha."

Zhang Gong's movements were a little slow, the gap between the nine stones was very small, and Zhang Gong had been trying to use what tools to use to reach in and lift the stone slabs out. Chen Zhijun kept watching, and Zhang Gong, who was almost helpless, said: "Uncle, don't expect any tools to hook up these stone slabs, just use a suction cup, I have one on the construction site, can't I let the old horse bring it?" ”

"If you don't bring that thing quickly, it will make me sweat!"

While waiting for the sucker, Chen Zhijun asked curiously: "Uncle, how did the mechanism in the stomach of this stone statue fit in?" Is it this stone statue stitched together in sections? ”

"Such a large stone statue can be completed in two ways, one is to take materials directly from this cave, that is to say, while digging the cave, the stone statue is repaired with the cut stone, but that is too laborious to do; The second is to move in from the outside, in that case, such a large stone statue will definitely not be transported in, and can only be spliced in sections. If it is splicing, the mechanism is easy to install, and the hollowed-out stone statues are spliced layer by layer, and the mechanism is installed layer by layer; But on the whole, it's a bit difficult, but it's not impossible to complete, you see this stone statue, a leg is much bigger than a person, and if you hollow it out in the middle, it's not difficult to lay out the mechanism. ”

"And what does this crossbow look like?"

"The crossbow has hardly changed in history, just like you used to play when you were a kid."

"Oh, then this combination lock should be an early product of mechanics, is there anything to say about this in the world?"

"Speaking of locks, China is definitely the earliest in the world, there are bone locks in the Stone Age, and there are locks in Luban's invention, and the lock culture slowly has the pursuit and complexity of craftsmanship."

"Luban lock?"

"Stinky boy, you don't know how to learn again! Luban lock is rumored to be Luban in order to test whether his son is a fool and made a toy out of six wooden strips, which is also a mortise and tenon structure, and that lock is not the same thing as you understand it now. ”

"Well, didn't you say that the origin of the combination lock was also Luban?"

"It is rumored that Lu Ban invented the password wooden box, but there is no substantial proof, and it is also said that it was invented by Zhuge Liang, maybe there is, many of his inventions have been lost."

As he spoke, the old horse brought the suction cups, and by the way, he helped remove the stone slabs aside. With the removal of the slate, the secret of the underground emerges: the space below is not flat, in addition to the frame necessary to place the slate above, the height of each slate is also different, very regular from deep to shallow, each slate lattice has a lever contact under the lattice, and all the levers are transmitted to the inside through the space under the stone statue.

"This side is just a trigger device, and you still need to go inside to really dismantle the mechanism, this is because the tomb owner is afraid that someone will remove the mechanism from here and divide the mechanism into two, in this way to prevent the mechanism from being directly removed from the underworld."

Professor Chen nodded in agreement: "The organs are all laid out from the inside out, otherwise they can be dismantled from the outside, and there will be no danger to the tomb robbers, so let's go inside now." ”

"Didn't the tomb owner leave a message on the bamboo slip saying that there were three mechanisms, and now it's the second one, so the rest must be in the corridor behind the stone statue."

"Well, there are no two roads behind the stone statue, only one, and the mechanism technique in the Eastern Han Dynasty is not too complicated, so I think it is a chain flip mechanism, this is the easiest to crack, Lao Zhang, you go and solve it."