Leonardo just watched Bifang take out the second hand from the watch, rub it on his hair a few times, put it on a leaf and put it into the water, then pointed to the stationary direction and said that was north and south.
What north and south?
what?
[I know, this is Lorentz’s theorem! 】
[When talking about Lorentz’s theorem, I slowly typed a question mark]
[Is it magnetization? Have you never been to school? It should be the same as a compass, but it is temporary]
"The principle is actually very simple. It is the forming principle of a compass, but one is permanent and the other is temporary." Bifang picked up the leaves in the puddle, drained the water, put the pointer on it back, and buckled it.
Tighten the dial.
"Repeatedly rub a piece of wire or a sewing needle against silk or hair in the same direction. I wonder if you ever played with rubbing a plastic ruler on your hair when you were in school, and then sucking up the scraps of paper.
game?
In fact, the truth is that the iron wire will produce magnetism, and when hung, it can indicate the North Pole.
It is similar to placing a magnet bar in the center of the earth. The magnetic north pole is near the geographical south pole, and the magnetic south pole is near the geographical north pole. The magnetic poles and geographical poles do not completely coincide with each other, and there is a magnetic declination, but in terms of identifying the direction, it is enough.
.
The magnetism will not be very strong. After a period of time, you will need to rub it again to increase its magnetism.
If you have a battery with a voltage of 2 volts or more, you can use current to magnetize metal. You also need to prepare a small piece of metal wire, and the outside of the metal wire should preferably be covered with insulation."
[I know the one that sucks scraps of paper, I often play it, dog head.jpg]
[No way, no way, there are really people who have never used plastic paper to suck up scraps of paper, right?]
[But what if you don’t have a watch? Can’t everyone wear a wire? 】
Leonardo also raised such doubts. Indeed, what if there is no watch? Or what about an electronic watch?
This method still has limitations.
He wanted to know a more general and universal method from Bifang.
"If you don't have a watch second hand, you can also use a thin, flat razor blade to indicate the direction, because it is made of two types of metals bonded together. You can make it magnetic by carefully rubbing the blade on your palm, and then hang it
Hanging it up can achieve the same effect."
"If you don't have any of these, and you are really lost, and the phone still can't be connected, then you can dismantle the phone. There will definitely be something inside. I think everyone should have a mobile phone, right? Or a flashlight, or any electronic device.
It will be all right."
Leonardo also wanted to ask, but Bi Fang stopped him directly: "Forget it, under what circumstances can a person be reduced to having no equipment on him, no plants, no sun, and even the terrain?
Not yet?"
The audience smiled knowingly.
"Besides, sewing needles or paper clips are essential items for outdoor adventures. Don't you have any?"
Leonardo scratched his head: "I brought a kettle, a flashlight, a knife, water purification tablets, and a medical kit. That's it...is there anything else?"
Bi Fang was too lazy to say anything. After all, the other party was just an amateur. He might have prepared these things based on his feeling. He had good outdoor awareness even if he had water purification tablets.
"Among the basic wilderness survival tools, knives are the most commonly used tools in critical situations."
"In addition, you also need a knife, waterproof matches, candles, fishing lines, various types of fish hooks, two small baits, wire for traps, water purification tablets, whistles, ropes, paper clips or other
"Put all these things into a small container. This container can also be used as a small kettle to boil water in an emergency. Seal it and keep it dry. Make sure to put the wilderness survival kit in your backpack before each departure.
In a backpack or clothing pocket.”
[Write it down, place the order now, and keep it in your bag for future use]
【You don’t think it can be used, do you?】
[What if I get lost in the forest in the future, dog head.jpg]
[Others are exploring, fully equipped, ×, Fang Shen is exploring, a pair of underpants, √]
This was the first time that Bi Fang told everyone in detail what he needed to prepare for an adventure, and he immediately wrote everything down.
"Basically, I have already mentioned all the methods for identifying directions. Except for a few exceptions, which have little applicability, such as ant nests always running north and south, the others are completely sufficient." Bi Fang did not dwell on this issue.
If you struggle too much, move on.
While walking, he said: "Having a general direction is not enough. Many times, you may have lost your way as soon as you turn around, because the surrounding environment is too similar. Therefore, before moving forward for a certain period of time, you must first follow the directions on the road.
A certain geographical feature is a marker."
"That is to say, you must find a certain geographical feature on the ground, such as a tree, make this reference object consistent with your direction of travel, walk towards it, and then repeat this process until you know your destination
.”
"All ant nests run north-south?" Leonardo quickly followed, asking somewhat incredulously.
"Yes, this is the structural wisdom of living things. The nests of ants and termites are all 'mounds' or 'thin blade-like' structures, and they must run north-south, with the entrance of the hole facing south, so that they can be illuminated by the sun in winter.
By the way, you can avoid direct sunlight in summer.”
Leonardo looked shocked: "You know too much!"
"How can you have the nerve to hang out when you don't understand anything? When you know the function and name of every plant, the habits and weaknesses of every animal, the making and use of every tool, and the cause and trend of every terrain,
You won’t be afraid of the wilderness.”
"Then have you reached such a state now?"
"Me? I'm still far away."
Bi Fang crossed the dense woods and stepped onto a rock. The sound of gurgling water suddenly became louder.
A stream no more than two or three meters wide appeared in front of everyone.
Leonardo looked happy, his pale face returned to color, he had really found it!
He couldn't wait to go to the stream and pick up a puddle of clear water. The stream here gathered from nowhere. After being filtered by rocks and sand, no impurities could be seen, and it was clear and transparent.
However, having learned from the past, Leonardo did not dare to put it in his mouth to drink. He took out a kettle, filled it with water, and put two water purification tablets in it.
[Although I have said it many times, I still want to shout out, Fang Shen is awesome!]
【Really awesome!】
Every step is very safe. If you say you are looking for a water source, you will definitely find it.
If you can find the direction, you can definitely find the direction.