This, how do you see this?

Leonardo watched Bi Fang take out the second hand in his watch, rub it on his hair a few times, put the leaves on the pad and send it into the water, and pointed to the still direction and said that it was north and south.

What North and South?

What is it?

[I know, this is Lorentz's theorem!] 】

[Speaking of Lorenz's theorem, I slowly typed a question mark]

[It's magnetization, right?] Didn't go to school? And the compass should be a truth, but temporary]

"The principle is actually very simple, it is the principle of forming the compass, but one is permanent and the other is temporary." Bi Fang picked up the leaves in the puddle, drained them, put the hands on them back on, and fastened the dial.

"Rubbing a piece of wire, or a sewing needle against silk or hair in the same direction, I wonder if you ever played a game of rubbing a plastic ruler on your hair and then sucking up the confetti when you were in school?

In fact, it is a truth that the wire will produce magnetism, and when hung it can indicate the North Pole.

It is approximate to place a magnet rod in the center of the earth, with the magnetic north pole near the geographic south pole and the magnetic south pole near the geographic north pole. The magnetic pole does not coincide completely with the geographical pole, and there is a magnetic declination, but in terms of direction, it is completely sufficient.

This is not very magnetic, and after a while, you will need to rub it again to increase its magnetism.

If you have a battery, and it has a voltage of 2 volts or more, you can use the current to magnetize the metal, and you also need to prepare a small piece of metal wire, and the outside of the metal wire should be wrapped with an insulating skin. ”

[Suck the confetti that I know, I play a lot, dog head .jpg]

[No, no, there really isn't anyone who hasn't played with plastic paper to suck up scraps of paper, right? 】

[But what if I don't have a watch?] You can't everyone bring a wire, right? 】

Leonardo likewise raised such doubts, indeed, what if there is no watch? Or maybe it's an electronic watch?

There are limitations to this approach.

He wanted to know a more general, universal method from Bi Fang.

"There is no watch second hand, and it is also possible to use a thin, flat razor blade to indicate the direction, because it is made of two types of metal bonded. Carefully rubbing the blade on the palm of your hand will make it magnetic, and then hanging it up will achieve the same effect. ”

"If you don't have any of these, and you're really lost, and the phone still can't get through, then you can dismantle the phone, there will definitely be it inside, I think everyone should always have a mobile phone, right? Or a flashlight, all electronic devices will do. ”

Leonardo also wanted to ask, but Bi Fang stopped him directly: "Forget it, under what circumstances can a person be reduced to the point where he has no equipment, can't see plants, can't see the sun, and can't even see the terrain?" ”

The audience will smile.

"And sewing needles or paper clips are all necessary for outdoor adventures, don't you have them?"

Leonardo scratched his head: "I brought a kettle, a flashlight, a knife, a water purification pill, and a medical kit, that's all...... Anything else? ”

Bi Fang didn't bother to say anything, after all, the other party was just an amateur, and he might have prepared these things by feeling, and he had a good sense of outdoor water purification pills.

"Among the basic tools for survival in the wild, knives are the most commonly used tools in critical situations."

"In addition, there should be knives, matches, candles, fishing line, various types of fishing hooks, two small bait, wire for making traps, water purification tablets, whistles, ropes, paper clips or sewing needles, medical tape, plaster (band-aids), dental floss (tough silk thread), compasses, tweezers, paracetamol (analgesics), disinfectant alcohol."

"Put all of these things in a small container. This container can also be used as a small kettle to boil water in case of emergency. Seal it tightly and keep it dry. Make sure to pack your wilderness kit in your backpack or clothing pocket before you go. ”

[Write it down, place an order, and put it in the bag in the future]

[You don't think you can use it, do you?] 】

[What if you get lost in the forest in the future, the dog head .jpg]

[Others are exploring, fully equipped, ×, Fang Shen exploring, a pair of pants, √]

This is the first time that Bi Fang has said in such detail in front of everyone what he wanted to prepare for the expedition, and he immediately wrote down all of them.

"Basically, I've said all the ways to identify directions, except for a few that have little applicability, such as ant nests that always run north-south, and everything else is completely sufficient." Bi Fang did not dwell too much on this issue and continued to move forward.

As he walked, he said: "It is not enough to have a general direction, many times, you may have lost your way as soon as you turn around, because the surrounding environment is too similar, so before each section of the road, you must first mark a certain geographical feature on the way." ”

"That is, you have to find a geographical feature on the ground, say a tree, make that reference object align with the direction you are going, walk towards it, and then repeat the process to know the destination."

"Ant nests are all north-south?" Leonardo hurriedly followed, asking with some incredulity.

"Yes, this is the structural wisdom of living things, the nests of ants and termites are all 'mounds' or 'thin blades' structures, and they must be in a north-south direction, with the entrance facing south, so that they can be exposed to the sun in winter and avoid direct sunlight in summer."

Leonardo's eyes were shocked: "You know too much!" ”

"I don't understand anything, why are I embarrassed to come out and mess around? When you know the role and name of every plant, the habits and weaknesses of every animal, the making and use of every tool, the causes and trends of every terrain, you will not be afraid of the wilderness. ”

"So have you reached such a state now?"

"Me? I'm still far from it. ”

Bi Fang crossed the dense woods and stepped onto a rock, and the sound of gurgling water suddenly became louder.

A stream no more than two or three meters wide appeared in front of everyone's eyes.

Leonardo's face was delighted, his pale face returned to blood, he really found it!

He couldn't wait to come to the stream, and picked up a puddle of clear water, where the stream gathered from nowhere, filtered by rocks and sediment, no impurities could be seen, and it was clear and transparent.

However, with the experience of the past, Leonardo did not dare to drink it in his mouth, took out the kettle and filled it with water, and put two water purification tablets in it.

[Although I have said it many times, I still have to shout now, Fang Shen is awesome! ] 】

[Indeed cow! 】

Every step is very safe, and if you say that you will find a water source, you will definitely find a water source.

If you say you can find your way, you will definitely find your way.

How can such a person not give confidence?

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