The principle of the crane is very simple, and it can be found everywhere in the city.

Cranes, cranes on construction sites, and cranes and pulleys are almost inseparable, and they are a pair of good friends who are inseparable from Meng.

Although there is no steel boom at the moment, it is also possible to make a simple crane tower with wood, as for the pulley block, with steel now, it is not difficult to cast it, it is just a set of live rings.

The fixed pulley is responsible for changing the direction of the force, the movable pulley is responsible for saving the force, a fixed pulley plus a movable pulley combination can save half of the force, of course, this is theoretical, two fixed pulleys and a moving pulley can save two-thirds of the force, a fixed pulley and two movable pulleys can save three-quarters of the force, of course, these are theoretical, but anyway, the use of pulley block to save force is certain, the most important thing is that the direction of the force can be changed with a rope, and the worker does not have to stand on the high scaffold in a dangerous situation.

In front of the scaffolding more than 20 meters high stood dozens of worker slaves, wearing tattered clothes are using their hands to lift a seven or eight meters long waterwheel keel and several meters long huge wooden planks, and there is not even a safety rope on the body, as long as the foot slips, it will definitely fall down and fall into serious injury or death, in such an era of low medical level, any injury may be lifeless, not to mention a worker slave, if Chen Xu is not there, the steward on the construction site will not have the mind to save it, it will be thrown directly to the grass shed to fend for itself, and if it dies, it will be pulled outside and buried, and absolutely no one will care.

There are many bones buried in the Great Wall, and the mausoleum of Qin Shi Huang does not know how many prisoners died of exhaustion, and the death of Xiuchi Road cannot be counted, in this barbaric and primitive era, human life ...... It's not worth the money.

But in Chen Xu's view, all human lives are worth cherishing and cherishing, unless they are extremely evil people, these workers and slaves are not guilty, but just have a bad life.

It took twenty minutes, Chen Xu told Hu Kuan in detail about the pendant and pulley, although Hu Kuan was confused about the principle that the pulley group can save effort, but he did not have the slightest doubt, because Hou Ye never said nonsense, Hou Ye said labor-saving, that is naturally labor-saving, so Hu Kuan shouted to let the installation project pause, and then went to the office to design the drawings, and Chen Xu also dizzily stood up to go to the smelting workshop, today's main task is to make firearms.

In the smelting workshop, he brought in the hemp rod and the gong and the victory and a few craftsmen who were good at casting, Chen Xu took out a few drawings and explained them carefully, and then looked at a few people and asked, "Do you understand?" ”

"Master Hou, the difficulty of casting this pipe is not too big, but you said that pulling out the thin steel wire and winding it into a spring, I have never done this before, I don't know how to start, this steel is extremely hard, not as soft as twine!" As the chief engineer of the smelting workshop, Gong Shengsheng said with a wry smile.

"Actually, you're right, drawing wire is actually similar to spinning, but the material used is steel and silk linen, first cast an anvil with fine holes with very hard steel, and when the steel juice is not completely solidified, use steel tongs to pull out a thin head and clamp it in the small hole of the anvil, and the other end makes a spinning wheel-like reel, and then it should be able to pull out the steel wire under the rolling, which may involve quenching and other processing processes, and then the drawn filament is wound on a thin iron rod in a heated state. According to the length of the need, you can get the spring by cutting it with steel pliers, but when it comes to the size, length and strength of the spring, it takes trial and error to succeed, now you can first use the forging method to create a very thin steel wire, and then wind it into a spring, I will do the test first, and then these parts, this is the trigger, this is the hammer, this is the buckle and fixture for installing the spring......"

The arquebus is just a device to verify the firing method and power, and the ultimate goal is to create a flintlock musket, the principle is not difficult, the difficulty is to manufacture, because the flintlock musket seems to have a simple structure, but the excitation method is a complete set of linkage devices, triggers, springs, hammers, gears, each size must be very strict, and accurate to the millimeter level to achieve the desired effect, and these are not strictly supported by theory, completely Chen Xu imagined out of thin air, Of course, Daqin also has very strict manufacturing processes and skilled craftsmen, but in the face of this complex machinery, although the craftsmen in a circle seem to be serious and serious, in fact, the chaos in their hearts is the same as Chen Xu's state after he woke up after crossing over.

In Chinese history, from the beginning of the use of firearms in the Song Dynasty, until the appearance of flintlock muskets in the Ming Dynasty, it has gone through hundreds of years, and the application of gunpowder and steel has been very popular, coupled with the continuous contact with Western civilization, this is how someone slowly improved and manufactured more powerful flintlock muskets, and the current Daqin, it can be said that they have not even seen gunpowder, and the appearance of steel is also the last month or two, and the hot forging technology has just been learned, you discuss this complex mechanical structure with them, In fact, there is a feeling of self-inflicted abuse.

After staying in the ironmaking workshop and blacksmith shop for two hours, Chen Xu came out with a black face, and then he didn't bother to continue inspecting the construction site, and got into the carriage and went home directly.

The gap between the civilizations produced by more than 2,000 years of time and space is too big, just the production and construction of a spring, Chen Xu spoke for half an hour, and several craftsmen are still confused, as for the trigger, hammer, gear, fire door and barrel, etc., Chen Xu can only force them to build in strict accordance with the drawings designed by themselves, as for the effect after the creation, he can only pray for the blessing of the old man Taiyi and the gods and Bodhisattvas from all walks of life.

Everything is easier said than done, the beginning is difficult, the middle is difficult, and the end is also difficult.

Difficult! Difficult! Difficult!

This is Chen Xu's most profound experience at the moment, this has nothing to do with academic knowledge, it is only closely related to the level of civilization development in this era, this musket is relative to the craftsmen of Daqin, as if the earth scientists of later generations got the construction instructions of the interstellar gate, they may have a little clue, but they are absolutely confused for a long time, so if Chen Xu now says the construction principle of laser guns and electromagnetic guns, for the craftsmen of Daqin, Scientists who definitely belong to later generations will be stunned to death when they get the instructions for the manufacture of two-way foil-level weapons.

Therefore, after Chen Xu returned to the city, he decided to put down the musket for the time being, lest the gun had not yet been made, and he would no longer be able to survive suicide, after all, he had just invented steel and stirrups and saddles, which was enough to make Daqin's technology lead the entire earth civilization for hundreds of years, even if there were no firearms, Daqin could almost sweep the entire earth, this is the suppression of advanced civilizations, if you can equip 100,000 new horsemen, what Rest Empire, what Roman Empire, what Carthage, Macedonian Empire, are all scum, you can crush all the way.

But in any case, once the Eastern and Western civilizations collide, the result will inevitably be the integration and spread of civilizations, and the saddle stirrup will soon be learned by other civilizations in Europe and Asia, because the structure is too simple, and this advantage of Great Qin will inevitably not be retained after ten or twenty years.

Therefore, firearms, a higher level of technical reserves, is necessary, to let Daqin dominate the earth, just like the old United States in later generations, to be enough to reserve at least 50 years of technological superiority, with technology to form absolute suppression, the first aircraft carrier that China painstakingly built in later generations, theoretically speaking, is similar to the United States Independence aircraft carrier, and Independence was built after the end of World War II, more than half a century earlier than China's first aircraft carrier, this is the technological gap.

Later, when China began to study the moon, the Americans had already begun to study Mars, and the Mariner probe had already flown out of the solar system to truly travel the universe.

This is the gap, the so-called step by step, step by step, China began to lag behind in the Qing Dynasty, and then has been lagging behind, leading the ancient civilization of the earth for two thousand years, and has to do everything possible to endure humiliation and bear the burden to chase the pace of Western civilization, after half a century of development, all kinds of curves overtaking are very loud, all kinds of achievements are complacent, but only those who understand can see clearly, decades of catching up, the gap between China and the United States has not narrowed too much, because when China has the first conventionally powered aircraft carrier, The United States has eleven of the world's most advanced nuclear-powered aircraft carriers, and if China wants to build eleven of the same nuclear-powered aircraft carriers, aside from technology, it will take at least 30 years, and the United States in 30 years is estimated to have developed a spacecraft that can fly to Mars, that is to say, the technology of the United States is not the same era as the rest of the earth, just like Chen Xu and the current Daqin.

But Chen Xu, the history of China's later generations, did not want him to repeat it, he decided to use the prestige of Qin Shi Huang, the first emperor of the ages, and the military force of Great Qin to completely orientalize the earth's civilization...... It is also absolutely not allowed to Chinese take the English level four or six, what TOEFL IELTS is even more impossible, earthlings must speak Chinese, only Chinese is the most beautiful and authentic human language, and foreigners must pass the exam before they can become officials, the first question of the test content is to say tongue twisters, flat pole wide bench long......

"Hou Ye, Hou Ye~~"

Just when Chen Xu was sitting in the carriage and swaying all the way back to his house, all kinds of strange thoughts in his head were scurrying around, a hurried voice woke him up.

"What?" Chen Xu lifted the curtain and saw a guard in the house hurriedly riding a horse to meet him.

"Master Hou, Princess Huayu is here, and she has brought a lot of ingredients, Steward Chen asked you to hurry back home!" The guard said profusely.

Chen Xu's face couldn't help but twitch a few times, and he told the coachman to speed up.