Post by binbin on Aug 3, 2022 1:23:43 GMT -5
In modern society, enameled wire is the most widely used wire, because of the extensive use of electricity, it is found in the interior of large and small electrical appliances and electronic equipment. For example: as large as the stator and rotor windings of more than a dozen generators with an installed capacity of 1 million kilowatts installed under the Three Gorges Dam, as small as the cooling fans and transformers in various microelectronic devices, the core A component is composed of coils around which it is wound.
A copper wire with two ends (nonsense is not waste) is wound into a coil and then energized, it becomes a magnetic object, called an electromagnet. But the key is that the coils cannot be in contact with each other when the coil is wound. If they are in contact, the current will no longer flow along the coil circle by circle, but will "gather" directly from the contact, which is called a short circuit. In order to prevent this from happening, the wire used to wind the coil must be covered with a layer of insulating paint, called "enameled wire".
It is said that in the 1960s, there was a line of telephone poles in our village extending all the way to the north. Each pole had three horizontal poles, and there were many porcelain vases on the poles to fix the wires. It was only later that I found out that it was a telephone line. A separate wire was pulled under the three horizontal bars, which was the cable broadcasting line to the communes in the north, so a few smart people in the village were watching. At that time, the national economy was difficult and there was a shortage of materials. In terms of audio and entertainment, let alone radios, there were no radio speakers. A few middle-school-aged folks in the village understood the working principle of "reed horns". They fiddled with several meters of "enameled thread" as thin as sewing thread, wrapped it around a thick nail, and placed it vertically in a paper tube. , The periphery is fixed with cotton, of course, the two thread ends must be exposed outside. The lower end of the paper tube is a magnet, and a round iron piece is placed on the upper end next to the end of the iron nail, and a simple electro-acoustic device is ready. After dark, a few guys came together under a telephone pole, one stepped on the shoulder of the other (the rural people called it "shoulders"), and hung a piece of iron wire with one end folded into a hook on the wire, this broadcast. Even if the signal is brought down, then scrape off the insulating paint on one end of the enameled wire in the thing they made, connect it to the wire, and connect the other end to the other wire in the same way, and then insert it into the ground. . At this time, the few people put their heads in front of this gadget, held their breath, and turned their ears to the side. At this time, the indescribable excitement of those few can be imagined when I think about it now.
A sentence I often hear from people is "the emphasis is on participation", but for different things, the level of participation and the difficulty of the process are also quite different, especially for relatively high-end things that are difficult for ordinary people to reach. (like making something so "esoteric" at the time), it's more of an all-out immersion than usual. Chairman Mao said in his "On Practice": "If you want knowledge, you have to participate in the practice of changing reality. If you want to know the taste of pears, you have to change pears and eat them yourself." The process of eating pears , is the process of "revolution" of pears. You turn a whole pear into pear residue through your chewing. While you swallow sweets, moisten your lungs and relieve cough, you also know the taste of pears. Of course, the transformation is to change and improve the existing foundation, and this kind of production from scratch is an innovation based on the theoretical foundation. Don't underestimate this simple and crude production. This is actually the prototype of the "reed" type loudspeaker that was widely used later, which has a milestone significance in information dissemination.
Take a look at the development of information dissemination in today's society: the wide application of big data and artificial intelligence has brought about qualitative breakthroughs and quantitative leaps in people's living standards, and in many cases even subverted the cognitive scope and cognitive inertia of ordinary people. I can say with certainty: if the "heroes" in Tangshan knew that there was surveillance, they could record what they did so completely and frankly, or they knew they could monitor the video but thought that someone would deal with the video, so they did it. Dare to act so daringly and mischievously that he dares to break through the bottom line of social conscience. And they never dreamed that no master could retrieve that video through the Internet and post it online so that it could not be seen. It is said that the southerners returned to their residences after beating and took a nap. After waking up, they turned on their mobile phones and saw that "heroic deeds" had already been on the hot search. I can't stalk, but I have to stalk if I can't. The few people who are thinking about it now should have no regrets. What they regret is that they have done a great job, and quantitative changes lead to qualitative changes; the so-called "no regrets" means that they know that they are born with deficiencies, and their parents did not give them the brains that can store this knowledge. sooner or later.
A copper wire with two ends (nonsense is not waste) is wound into a coil and then energized, it becomes a magnetic object, called an electromagnet. But the key is that the coils cannot be in contact with each other when the coil is wound. If they are in contact, the current will no longer flow along the coil circle by circle, but will "gather" directly from the contact, which is called a short circuit. In order to prevent this from happening, the wire used to wind the coil must be covered with a layer of insulating paint, called "enameled wire".
It is said that in the 1960s, there was a line of telephone poles in our village extending all the way to the north. Each pole had three horizontal poles, and there were many porcelain vases on the poles to fix the wires. It was only later that I found out that it was a telephone line. A separate wire was pulled under the three horizontal bars, which was the cable broadcasting line to the communes in the north, so a few smart people in the village were watching. At that time, the national economy was difficult and there was a shortage of materials. In terms of audio and entertainment, let alone radios, there were no radio speakers. A few middle-school-aged folks in the village understood the working principle of "reed horns". They fiddled with several meters of "enameled thread" as thin as sewing thread, wrapped it around a thick nail, and placed it vertically in a paper tube. , The periphery is fixed with cotton, of course, the two thread ends must be exposed outside. The lower end of the paper tube is a magnet, and a round iron piece is placed on the upper end next to the end of the iron nail, and a simple electro-acoustic device is ready. After dark, a few guys came together under a telephone pole, one stepped on the shoulder of the other (the rural people called it "shoulders"), and hung a piece of iron wire with one end folded into a hook on the wire, this broadcast. Even if the signal is brought down, then scrape off the insulating paint on one end of the enameled wire in the thing they made, connect it to the wire, and connect the other end to the other wire in the same way, and then insert it into the ground. . At this time, the few people put their heads in front of this gadget, held their breath, and turned their ears to the side. At this time, the indescribable excitement of those few can be imagined when I think about it now.
A sentence I often hear from people is "the emphasis is on participation", but for different things, the level of participation and the difficulty of the process are also quite different, especially for relatively high-end things that are difficult for ordinary people to reach. (like making something so "esoteric" at the time), it's more of an all-out immersion than usual. Chairman Mao said in his "On Practice": "If you want knowledge, you have to participate in the practice of changing reality. If you want to know the taste of pears, you have to change pears and eat them yourself." The process of eating pears , is the process of "revolution" of pears. You turn a whole pear into pear residue through your chewing. While you swallow sweets, moisten your lungs and relieve cough, you also know the taste of pears. Of course, the transformation is to change and improve the existing foundation, and this kind of production from scratch is an innovation based on the theoretical foundation. Don't underestimate this simple and crude production. This is actually the prototype of the "reed" type loudspeaker that was widely used later, which has a milestone significance in information dissemination.
Take a look at the development of information dissemination in today's society: the wide application of big data and artificial intelligence has brought about qualitative breakthroughs and quantitative leaps in people's living standards, and in many cases even subverted the cognitive scope and cognitive inertia of ordinary people. I can say with certainty: if the "heroes" in Tangshan knew that there was surveillance, they could record what they did so completely and frankly, or they knew they could monitor the video but thought that someone would deal with the video, so they did it. Dare to act so daringly and mischievously that he dares to break through the bottom line of social conscience. And they never dreamed that no master could retrieve that video through the Internet and post it online so that it could not be seen. It is said that the southerners returned to their residences after beating and took a nap. After waking up, they turned on their mobile phones and saw that "heroic deeds" had already been on the hot search. I can't stalk, but I have to stalk if I can't. The few people who are thinking about it now should have no regrets. What they regret is that they have done a great job, and quantitative changes lead to qualitative changes; the so-called "no regrets" means that they know that they are born with deficiencies, and their parents did not give them the brains that can store this knowledge. sooner or later.
