When I looked up, I saw that the courtyard house suspended in the air had three courtyards, seven main rooms, and ear rooms. The main building is tall and has a Lang Garden. The boxy courtyard is carved with the remnants of wind erosion, and it is simple but endlessly stretches along the central axis. There is a gable wall to the south of the wing house to separate the courtyard, which is a courtyard by itself, and there is a hanging moon gate in the center of the gable, and the hanging flower door is the dividing line between the inside and outside. It exudes a rich historical atmosphere like a treasure box of incense, and retains the old time in the brick cracks and tiles.

There are one or two wings in the east and west of the outer courtyard, which are smaller than those in the inner courtyard, and the easternmost one is the gate, followed by the gatehouse, then the living room or study, and the westernmost one is the garage. The whole seems to be majestic and strong, the courtyard overlaps, the front porch and the back building, the verandah, the green tile flying, the curtain has no duplicate, the jade carved saddle once lived, there are bricks and tiles, stacked stones, and that group of harmony.

The hanging flower door, the shadow wall, the partition are very particular, there is a courtyard in the courtyard, there is a garden outside the courtyard, the courtyard and the garden are connected, it is a large residential building, and it is by no means an ordinary person's house.

Inside and out, here and outside, it looks like a stone history book.

Because it quietly Qianqian is independent in mid-air, the whole seems to be integrated, the light of the flashlight shines on the corners of the surrounding houses, and the faint white dots swirl in the light, surrounding every piece of the courtyard of the mortise and tenon, the finch replacement, the pier head, the clear water ridge...... Each side of the green tile, masonry, beast kiss, door pier...... All of them are filled with a sense of "I want to go back with the wind", as if he was forced to be pushed in the air by the Hercules in Greek mythology, and like the warrior who carried the sky, this shock will be difficult for people to withdraw from it for a while.

Everyone didn't speak, they all looked at the building in mid-air in front of them silently, and they really couldn't figure out how there could be a completely gravity-defying building in this world, which could not cover Newton's coffin board, but stand in the air with a good body.

The courtyard seems to be extremely quiet, covering an area of hectares, like a master of the world who has no quarrel with the world, waiting for people to come and grab firewood.

In the old days, Wang Xie Tang was in front of Yan, and Pengmen was now open for you.

Li Reform's face condensed slightly: Because of the two dogs' several commotions, in fact, the route he surveyed before was not this one at all, and now he has gone astray, and he is considered unlucky, but no matter how unreasonable things he has encountered, the front is blocked by this building, and there are chasing soldiers behind, no matter how he chooses, it seems that there is no other way to find it except to go in?

"Squeak-"

The vermilion door was pushed open, sending out a long distance like the oars swinging waves, Li Reform stepped in without fear, the face of the Iron King of the Thorn remained unchanged, and he also followed in, the lock king followed, the big dog hesitated slightly, or limped to follow the master, the second dog carefully looked at the courtyard that seemed to be the underworld and the zenith fairy palace for a long time, as if he didn't see anything famous, and his heart was horizontal, and he could only be forced to enter.

However, as soon as he entered, it was much beyond what people thought, it was not like the Senluo Hall of the Netherworld, only to see the Millennium Peak, Wufu Peak, and Furong Peak, towering and dignified; Long live the stone, tiger tooth stone, three-pointed stone, and the sudden phosphorus phosphorus produces Ruiqi, which is clearly the normal old Beijing courtyard.

For a while, everyone's hearts were a little sudden, and they really felt that they were illusory, but stepping on this courtyard, the green bricks on the floor were also a real feeling, and they couldn't be fake, and they looked at it with suspicion.

Then something even weirder happened—

Because this place is really strange, everyone came to the problem with suspicion at the beginning, and it doesn't matter if this problem is found, there are really many problems to find.

The first is that no matter which room it is, the door of this room cannot be opened, because there is a big lock hanging on it.

But if you talk about the lock, it is also a matter of hand-to-hand for the lock king, and the lock is not complicated, but even if the lock king opens it three or two times, there seems to be a cement wall behind the door, and it still can't be opened.

This is true not only of this door, but of every door.

It's weird.

The problem is not only this, except for the door that cannot be opened, everyone strangely found that no matter how the courtyard is arranged, there must be its symmetrical situation, and it is stuck to the place by the dead, and it cannot be held.

Strange symmetry, weird façade -

Everyone had realized the seriousness of the matter and wanted to retreat to the trestle before making plans, but when they pushed open the gate that came in, something even more puzzling happened: the trestle they came to disappeared so inexplicably?!!!

This is not a trick, how can it be said that it will change?

The courtyard was hung in mid-air, and on the right side was still the huge smooth mountain with thousands of walls, and there were still four sons and mothers waiting fiercely at the bottom, and when they saw everyone appear, they were excited, "wow, wow", shouting to eat them.

How is that possible?

How is that possible!!!

If the trestle never appeared, then how did they get up to this quadrangle suspended in mid-air?

Everyone subconsciously wanted to say "ghosts hit the wall", but the ghosts hit the wall and they are trapped in one place and keep going around in circles, they are not going around in circles now, but they are trapped in one place at all, there is no way out, there is no way out, and even the way to come has disappeared cleanly.

Ergou muttered two sentences, to the effect that "I knew that I would be so unlucky, it is better to stay on the trestle", and now everyone has a slight agreement in their hearts, and they all looked at Li Reform, waiting for him to make an idea.

"It's not a ghost hitting a wall."

Li Reform firmly took the lead, but he also hesitated in his heart: he had never seen such a strange thing, since it was not, then what was it?

With a bang, Li Gengai closed the Zhu door and looked at everyone solemnly.

"Guys, now I need you to do me a favor."

"You say."

Now, as long as you can go out, everyone is naturally willing to spend this effort.

"I need you, help me measure the foundation here, the length of each brick, the distance of each beam, I need to do a demonstration."

Demo?

The corners of Li Reform's mouth curled: Yes, demonstrate, let's test whether everything that happened here is a natural disaster or a man-made disaster.

If it is a man-made disaster, then this man-made factor can be eradicated.

The earth has a magnetic field from the south pole to the north pole, and the magnetic south pole is actually close to the geographical north pole, as long as you compare the influence of the geomagnetic field on the magnetic field generated by the current flowing through the wire coil, and measure the strength of the earth's magnetic field in the transverse part, you can judge whether the space you are in is a "ghost" space in the scientific sense.

The first is several meters of insulated wire; A fixed pointer with less friction on the hinge is also required; The protractor is easy to do; The cylinder used to wind the coil, the diameter of which depends on the length of the compass pointer, which needs to be longer than the compass pointer; A ring frame or other object that can support the coil is also required; It can provide 1A or higher current DC power supply; A DC ammeter or a multimeter that can be configured as a DC ammeter with a measurement range of 0-10A –

This is a bit difficult, but the dry battery in the flashlight can be useful if it is handled properly.

Everyone was busy over there for a long time, and they all came together to report the data to Li Reform, but there were still a lot of things that had not been measured, but Li Reform waved his hand, "It's enough." ”

He set up the compass, made sure it could rotate freely and point to the north pole, and wrapped a cylinder around a 15-turn coil, because a 1.5-inch diameter tube would be suitable for a small hand-held compass, and a soup or coffee can would be more suitable for a pivot compass.

When the coil is finished, scatter the object used to wrap the coil. Leave some wires at the beginning and end of the coil to connect the coil into the circuit.

Support the coil with a ring frame or other support. The coil is placed in an east-west direction, perpendicular to the coil plane. The compass must be in the plane of the coil so that the ends of the compass can be observed, pointing in the direction in which the coil is wound.

Everyone watched Li Gengai's twists and turns, disassembled the battery, and turned out a large number of coils from the equipment bag: with his big equipment bag, there was no food or drink in it, all used to put these inexplicable things?

Li Reform's expression remained unchanged, his body shuttled through the arranged coils, and from time to time compared the data obtained, but his heart tightened.

The Earth's magnetic field can be measured by equilibrium it with a known magnetic field, and if the angle of the known magnetic field and the horizontal Earth's magnetic field reaches a suitable value, the compass points to a new angle that deviates from the initial direction by 45°. Far from the equator, there is a certain angle between the direction of the Earth's magnetic field and the horizontal direction, and this angle can be measured. The strength of the entire magnetic field will be slightly greater than that of the horizontal direction.

In the end, the value of the entire test will only lead to one conclusion: if there are some unknown corpses in this space, such as ghosts that can affect people's minds and cognition, this demonstration can play a key role.

It is necessary to ensure that the DC power supply is turned off and that the DC ammeter is also set to read the current state in the range of 1 to 10A.

After stripping off the insulation at both ends of the wire, connect one end of the wire to the positive end of the ammeter, and the other end to the negative end of the DC power supply.

Then connect the negative end of the ammeter and the positive end of the DC power supply to complete the whole circuit.

Place the protractor so that the zero degree line and the compass are pointing in the same direction when exposed only to the Earth's magnetic field.

Slowly and carefully turn on the DC power switch, increasing the current reading of the ammeter until the compass deviates 45° from the initial position.

At this point, the Earth's magnetic field in the horizontal direction is equal to the magnetic field generated by the coil and is balanced by it.

The formula for calculating the strength of the Earth's magnetic field is as follows:

15 turns × (1.26×10-6) × (current value (unit: A)) / 2× coil radius (unit: m)

1.26×10-6 is equal to 0.00000126, so you can multiply the inch by 0.00254 to get m.

The magnetic field generated by the coil is orthogonal to the plane of the coil, and Li Gengai recorded the data with white chalk on the ground, and obtained the conclusion that the magnetic field generated by the coil and the earth's magnetic field in the horizontal direction are orthogonal, and when the magnetic field of the coil and the earth's magnetic field in the horizontal direction are exactly equal, the point where this situation occurs is at the angle of 45° between the two. When equilibrium occurs, the Earth's magnetic field can be calculated by equations.

In unit Tesla, N is the number of turns of the coil. μ0 is the strength of a magnetic field generated by a given current, called the permeability of free space, which is equal to 1.26× is the radius of the coil, and the unit is m.

Therefore, a coil with a diameter of 2 inches and 15 turns requires a current of 0.28A to rotate the compass at a 45° angle.

The magnetic field strength is: B = (15 turns× 1.26×10-6T-m/A×028A)/(2×0.051m) = 0.00000052T or 5.2×10-5T.

This is the expected range of fluctuations in the Earth's magnetic field at mid-latitudes.

The expression on Li Reform's face was instantly very special and psychedelic, and the hand that picked up the chalk was stunned on the spot.

"What's wrong?"

Everyone was very excited to see that he was writing and drawing, and they all felt a little surprised when they stopped at once.

"I was wrong, not only is there nothing strange about the magnetic field here, but it's even-" Standing up slowly, "it's normal. ”

In other words, this is an impossible place that has been forgotten by the world!!