First, in the Ming Dynasty, the difficulty of building generators and wired telegraph transmission and receiving devices is not ordinary, the main difficulty lies in the production of wires, wires should be placed in modern times, it is really not a thing, there are everywhere inside and outside the house, and the grocery store in any small town has to buy it, but the Ming Dynasty did not have to buy it at that time, not only the Ming Dynasty, but the whole world did not have this thing.

Is wire hard to make? Modern people may not understand, it is obviously a very common thing, it is everywhere, what is so difficult to do?

First of all, it is difficult to draw wire, the copper wire in the wire can be hard-drawn with copper rods, the Ming Dynasty did not have a wire drawing machine to buy, to make their own. To squeeze the copper out of a small hole like a noodle, how hard it is, and how hard is the drawing die that withstands the extrusion force. Moreover, it is not that the copper wire is squeezed out and it is over, you also have to straighten the copper wire according to the speed of extruding the wire, roll it into a roll, and the speed of this rolling also has strict requirements.

Then, it is not enough to just pull out the copper wire, but the wire is used to transmit electricity, and the outside must be covered with an insulating layer, which is the so-called wire skin. Modern wires are basically covered with plastic insulation, plastic is refined from oil, oil was not difficult to find in the Ming Dynasty, but it is more difficult to extract plastic from black oil than to make wires, think Zhu Cijiong still gave up. In fact, the insulation layer can also be replaced by rubber, which is much easier to produce than plastic, as long as the sap of the rubber tree is processed slightly. South America, the origin of rubber, now happens to be a colony of Spain and Portugal, as long as Zhu Cijiong says a word, the Portuguese governor of Macao, Shi Vera, and the Spanish governor of Luzon, Corquian, will definitely compete to give him rubber from the Americas.

As long as the wires are made, the generator and the wired telegraph sending and receiving device are relatively simple.

Like a generator, the shell is cast in a wooden mold, and then put it on the machine tool to process it, the bearings are also ready-made, the magnet is not difficult to find, and the winding is similar to spinning, but the yarn becomes a wire. The wired telegraph sending and receiving device is simpler, to put it bluntly, it is to take the wire on a small iron rod a few times, make an electromagnet out, and then switch the whole thing.

Of course, these simplicitys are only relative to Zhu Cijiong alone, for Daming and even everyone else in the whole world, these are unimaginable things, not to mention that there is no concept of electricity at this time. Zhu Cijiong is also having a headache for this problem, he is the emperor, it is impossible to run around the coil and make electromagnets, if this set of things is made into a large demand, there must be at least one set in each county, think about the number Zhu Cijiong's scalp is numb, if he wants to do it alone, it is estimated that he will not be able to finish just sitting there and winding the coil in this life.

What will no one do? Of course, it is impossible for Zhu Cijiong, as the emperor's honor, to go to Daming Institute of Technology to teach as a teacher, he can only select one or two people to teach alone, train them into talents in mechanical and electrical engineering, and then let them teach others.

Now the problem comes again, learning science, especially learning physics, talent is very important, talented people will understand as soon as you say it, and people without talent may not be able to nag in his ear for a year or two, Zhu Cijiong didn't want to teach for a few years with a wooden lump, so he decided to select it on a small scale.

What is the talent of studying science, this has really been summed up, saying that abstract point is smart, especially smart, and concrete point is flexible thinking and strong logic. How can you tell if a person is smart or not? Naturally, it was a test, and for this reason, Zhu Cijiong personally came up with a test question, convened a group of Jinshi from the Jiaxu Branch in the seventh year of Chongzheng, and organized a special palace test, which was called Bingzi Enke.

First of all, the age must be around thirty years old, if you are too old, your thinking has been solidified, and it will be more difficult to accept new knowledge; And he must be loyal and upright, he does not want to raise a white-eyed wolf; As for why only from the seven years of Chongzheng's Jinshi, age is a factor, because there are basically no Jinshi under the age of forty in Chongzheng's first and fourth years of Chongzheng, and there is a more important reason is the position problem, the people he cultivates will be at least three grades in the future, and even two grades and one grade are possible, and it is not possible to have the title of Jinshi.

Combining these conditions, less than thirty people finally met the requirements, looking at the leaders among these scholars, Zhu Cijiong couldn't help but beat a drum in his heart, you must fight for breath, my requirements are not high, as long as one or two can answer correctly.

Even he himself is so nervous, what kind of difficult question is he coming up with? In fact, this topic is not difficult for modern people at all, as long as you have gone to college, you can basically make it, and the topic he came up with is:

Today, 0 is zero, 1 is one, 2 is two, 3 is three, 4 is want, 5 is together, 6 is land, 7 is Qi, 8 is 捌, and 9 is Jiu, which is used to simplify the numbers.

The current counting method is every decimal place, such as 0 to 9 is ten numbers, and the later carry is 10, that is, pick; 10 to 19 are the same number of ten, and the subsequent carry is 20, that is, two picks, and so on.

If only 0 and 1 are used, every two digits, then 0 is still zero, 1 is still one, 10 is really two, 11 is really three, and 100 is really wanton.

If we count by the binary method, 1010 is geometry, and 1110 is geometry?

If you write in the binary method, how to write 7 and how to write 9?

This is actually the basic content of logical algebra in advanced mathematics, binary code, for modern college students is naturally handy, extremely simple, but for these ancient college students, even equivalent to master's and doctoral students, this is simply their life!

Zhu Cijiong stared nervously at these candidates, a quarter of an hour passed, two quarters of an hour passed, some were full of surprise, some were confused, and some were meditating, but none of them started writing.

His heart slowly sank, he only gave an hour of time, because this time it was to test whether their thinking was flexible and logical, and if they were given too long, it would be meaningless. He believes that if these people are allowed to go back to study for ten days and half a month, it is estimated that no one will be able to answer, but what can that prove? At most, it only proves that they are not stupid, and it has little to do with science talent.

Half an hour later, a candidate finally picked up his pen, but he looked at the test questions on the table and was stunned.

Zhu Cijiong has been staring at them, someone has picked up a pen at this time, he doesn't want to mention how excited he is, why is this person stunned and doesn't move? He thought about it, slapped his forehead, and immediately beckoned Cao Huachun to come over, and whispered.

Soon, a team of little eunuchs each walked in cautiously with a thick stack of white paper, quickly put a pile on each candidate's table, and then cautiously retreated.

The vast majority of candidates were stunned when they saw the pile of paper, and looked at the test questions sent down, which obviously required them to answer directly to the back of the questions, and now they are sending a stack of papers to each person, what does this mean?

They don't understand, naturally some people understand, the candidate who just lifted the pen saw the pile of white paper and immediately got a treasure, and excitedly put the pen with the premise.

Zhu Cijiong looked at his confident appearance, couldn't help but stand up, walked over, and saw what he was writing, whether he was doing what he thought in his heart, making a draft, and making simple calculations.

The emperor actually ran down in person, which was not common in the previous palace examinations, although the candidates present were all high school scholars, and they were officials in the court, they were inevitably a little nervous, but the person who waved the pen and wrote may be too involved, and there was no reaction at all, and he still wrote there non-stop.

Zhu Cijiong walked behind him and looked, a piece of scratch paper was almost full of him, the habit of the Ming Dynasty was to write vertically, this one naturally also wrote one column after another, the first column is capitalized zero to nine, the second column is Arabic numerals 0 to 9, the third column is capitalized to pick up Jiu, the fourth column is Arabic numerals 10 to 19, the fifth column is capitalized two to two pick up nine, the sixth column is Arabic numerals 20 to 29, the writing is extremely neat, the words are evenly spaced between words, as if measured with a ruler.

At this time, he had already begun to calculate, he took a new piece of paper, the first column he wrote with a capital zero and one, the second column he wrote the Arabic numerals 0 and 1, the third column with a capital zero and one one, the fourth column wrote the Arabic numerals 10 and 11, when he wrote the fifth column, he paused, looked at the title carefully, and then decisively wrote down one zero zero, one zero one and one one one, and the sixth column was 100, 101 and 111.

Seeing this, Zhu Cijiong also showed an excited expression, such flexible thinking, such strong calculation ability, don't think about it, this must have figured it out.

Sure enough, the candidate quickly wrote down one zero zero zero, one zero zero one, one zero one one, one in the seventh column, and 1000, 1001, 1011 and 1111 in the eighth column, and then he counted carefully and replied decisively at the back of the test question:

If you count by the bipolar method, 1010 is actually a pickup, and 1110 is a pickup.

If written in the binary method, 7 should be written as 111 and 9 should be written as 1001.

Completely correct, Zhu Cijiong resisted the urge to applaud, and glanced at the signature on his test paper, Xu Fuyuan, well, it's him, even if everyone else can't answer, it doesn't matter, this one is enough.

However, Zhu Cijiong miscalculated this time, all the candidates saw him return to the dragon chair with satisfaction, and they all knew that this Xu Fuyuan was afraid that he had answered correctly, although no one peeked at his answers, but there were many people who imitated his appearance and wrote on the white paper, an hour later, the exam papers were collected, and there was really one person who also answered correctly, but the name was a little strange, what is Xia Yunyi.