Although Etalic was old, his footsteps were light and powerful, and he moved as fast as the wind. His steps are precise, his hands and feet are coordinated, and his legs are slack. While walking, the old warrior wears his legs with his hips, and his center of gravity is only slightly ups and downs, and the leisurely charm is naturally born.

Seeing this, Bertard's eyes narrowed, his feet exerted strength, and he ran like a tiger. He strode alternately, with a sense of jumping, and the rhythm of tigers and leopards in coordination.

Sherlot is in good shape. Although he couldn't compare with the two experienced warriors, he also completely mastered the running skills of the warriors. When the teenager walks, the muscles are integrated, flexibility, speed, balance, and explosion. The four standards enter the room, and they are always ready for fighting.

In this era of weak long-range and insufficient lethality of stone tools, personal force has been displayed to the greatest extent. The training of the samurai is counted in ten years, and it can firmly suppress the militia several times. Naturally, he has gone a long way in the exploration of physical strengthening. The unparalleled fierce generals controlled their pace and could kill seven in and seven out in the scattered formation, while the stone spears of the militiamen were no threat.

However, the charcoal in front of Shulot, together with sulfur and soil nitrate, ended the era of fierce warriors ahead of schedule!

The use of charcoal can be traced back to the Teotihuacan civilization in Central America. In the banquet in the fresco, the ancestors grilled venison over charcoal. For teenagers, charcoal firing technology is an important cornerstone of civilization. Charcoal can make pen and ink for painting, absorb moisture to forecast the weather, and purify the air soot

And most importantly, charcoal can be used as high-temperature fuel, participating in the configuration of gunpowder and the forging of metal!

Although the invention of charcoal is very early, in fact, under different production methods, the quality and productivity of charcoal vary greatly.

The essence of charcoal is carbonized porous wood produced by incomplete combustion or pyrolysis. It is flammable, smokeless, high in calorific value and extremely low in water content. The quality of charcoal is reflected in the unit calorific value, which depends on the temperature conditions during carbonization. The higher the carbonization temperature, the higher the unit calorific value of the charcoal and the better the quality. The productivity of charcoal is the efficiency with which a fixed weight of wood is converted into charcoal.

In Scholot's memory, the power of black powder lies in the oxidation exotherm and gas release in the reaction. The sharply increased temperature heats the massively released gas, and the volume of the gas increases exponentially, producing a violently expanding explosion. Therefore, the better the quality of the charcoal, the higher the combustion temperature and the greater the power of the black powder.

In metal forging, the biggest limitation of classical technology is insufficient temperature. When the water of gray cast iron is below 1500 degrees, the performance of cast iron will be improved with the increase of temperature. Due to the addition of carbon, the initial forging temperature of forged steel is 200-300 degrees lower than the optimum temperature of cast iron, generally around 1200 degrees, and then the final forging temperature gradually decreases until about 800 degrees.

In order to achieve such a high temperature of more than 1,000 degrees, in addition to designing a blast furnace, excellent charcoal or coal coke with high calorific value is essential.

In other words, charcoal, a high-heat fuel, acts on bronze, iron, gunpowder and even the industrial age, and is an indispensable source of power for the development of civilization!

Shirott stood in front of the smokey charcoal mound, facing the kneeling charcoal burner, pondering.

Seeing the calmness of His Highness, the leader of the charcoal worker at the front took two steps on his knees and fell to the ground.

"Your Highness, God of Fire bless you! We have just finished burning two piles of charcoal, please check it out."

Hearing this, Xiulote looked up and saw a black mud mound in front of him, shaped like a "grave mound", less than one meter high and about two meters in diameter at the bottom.

The surface of the mud pile has cracked several cracks, but it was just painted by the charcoal workers with new mud, and the color is lighter. There are several ventilation holes at the bottom of the mud pile, which are supposed to be channels for oxygen, but they have been blocked at this time. At the top of the mud pile, there is a fire opening two palms large, which has not been completely blocked at this time. Curling green smoke emerged from the "grave mound", which looked like a good omen in the legend of the Celestial Dynasty.

Shirott looked to the side again, and another pile of charcoal had already been burned and cooled.

The leader of the charcoal workers with a dusty face urged in a low voice, and the charcoal workers stepped forward together, ripped apart the mud pile, and took out a large amount of black charcoal from it. Then the leader of the charcoal workers picked them up, picked out a few pieces of good charcoal with a glossy surface, hard and pitch-black surface, and held them in his arms, and handed them to the Highness as a gift.

"His Royal Highness, look, this is the best quality charcoal! It's hard, black and shiny, and it burns hot and fierce. You can touch two pieces to make sure it's crisp and delicious!"

The charcoal was related to the military affairs, so Shilot directly reached out and took two pieces, collided and listened to them. His palms quickly smeared black, the familiar smell of charcoal fire choked on his nose, and there was indeed some crisp thumping in his ears. The young man's heart resurfaced with distant memories, and he nodded slightly.

Immediately, Shilot took two steps forward, and under the surprised eyes of the charcoal workers, he squatted in front of the charcoal pile to check the shape of the mud pile. Then, he took out two pieces of charcoal from the bottom, the tentacles were slightly soft, and there was no black light on the outside. The charcoal leader's expression changed instantly. The teenager put the charcoal next to his ear and collided it again, and the sound was dull, which was regarded as insufficient heat and poor quality.

Shirot took a step back and stood in front of the charcoal pile, silent. The leader of the charcoal workers stood by, carefully explaining the specific charcoal burning process.

Obviously, the charcoal burning process used by the charcoal workers is the most primitive heap burning method, which is about the same technical level as the tribes of the Black African continent. First put a wooden stake in the middle of the open space as a support, then pile up standing firewood on both sides, then wrap leaves on the firewood, cover with wet mud, and leave vents and fire holes.

When the top burner ignites, oxygen flows in from the bottom vent, and the flame descends from the top, extending against the flow of oxygen. The charcoal workers use the amount of ventilation to control the size of the flame. They will block the vents where they are burned. After the vents are blocked, the flames will be blocked until they see the smoke coming out, and they can cool down and wait for the "furnace" to open.

After listening, Shilot simulated the specific combustion process in his mind. In general, the charcoal near the fire port should be over-burned, the middle quality is the best, and the vent position should be under-burned.

After a while, he looked at the uneasy leader of the charcoal worker and asked calmly.

"What is the yield of this pile of charcoal? Can you get half the quality charcoal?"

The leader of the charcoal workers was slightly taken aback. Immediately, he hurriedly ordered the craftsmen to weigh them on a simple large scale. He glanced left and right, and while His Highness was not paying attention, kicked a few stones into the charcoal of the Great Balance. After a while, the leader of the charcoal workers respectfully replied.

"Your Highness, eighty parts of wood can burn fifteen parts of charcoal."

Xiulott mentally calculated a few seconds, divided 15 by 80, which was about 19, which was a tricky hexadecimal system. This efficiency is much lower than he remembered.

"Is it dry wood?" the boy asked.

The leader of the charcoal workers nodded, of course it was dry wood, and only a little of the raw wood was burned.

"How much is the high-quality charcoal you picked out just now?"

In Shilot's view, only that kind of high-quality charcoal is suitable for powder charcoal for gunpowder. The production of soil nitrate is not easy, the output is limited, and the purity cannot be guaranteed. If the quality of charcoal powder is not good enough, the power of gunpowder can be imagined.

"Five no, seven." The charcoal leader gritted his teeth and said.

Well, five servings. Shilot nodded knowingly, the first number was credible. Then, he shook his head again, 6-7 qualified charcoal output. This charcoal-burning efficiency is also too low, and technical improvements must be made.

The boy recalled familiar memories again. His thoughts flew back to the distant era, to the future of the Celestial Dynasty. Building a kiln to burn charcoal and building a kiln to burn bricks, these two kinds of earth-style buildings are memories of the past in the countryside, just a glimpse in his childhood fantasy.

Sherlot fell into long and difficult thinking. Bertard had already prepared, sending charcoal and large wooden planks from local materials. Etalek was delighted, sat cross-legged on the hot mud pile, and paid attention to His Highness's "divine revelation".

Shulot was distracted. He first drew an enlarged version of the earthen kiln, doubling the size and changing the shape to a square. Finally, it is four meters long, two meters wide and two meters high. The young man made a rough calculation, 16 cubic meters, and it is estimated that 2-3 tons of dry wood can be put in. Recalling the difficulty of logging in this era, he shook his head again and changed the size to 2 meters long, 1 meter wide and 1 meter high, to test the specific design effect.

Next, referring to vents and burners, Shilot recalls two key words: flue and fire.

The young man first drew a fire path on the bottom of the long and wide kiln, and then painted another one, leaving only a two-meter-long fire path along the center of the long surface. The fire channel is connected to both ends, and its function is similar to that of the fire port. It is used to insert dry wood to start the fire, so as to burn the wood into charcoal.

He wasn't quite sure about the width and height of the fire path, but he only estimated the width and height of the two palms. Then, he thought about it again, the flame should be from the ignition point, from the bottom to the top, the ignition port of the fire path should be lower than the end, how much lower? Well, it's also two palms.

Next is the flue. According to the boy's analysis, the flue should be opened in the surrounding soil. The temperature at the top of the flame is the highest, and the wood in the kiln is carbonized from top to bottom, then the flue is reversed, from bottom to top, the opening is at the bottom, and the width is still two palms. Then, the smoke ascends from the bottom along the flue in the outer wall, and is emitted from the top smoke hole, which is narrow at the top and wide at the bottom, which is convenient for the top hole to be sealed. Well, the smoke eye is only the size of a palm.

At this point, the talent in Shulot's belly has been exhausted. He thought about it for a while with a serious expression, and the fire was burning, and there was no problem with the logic.

Continuing to think about it, he added a few pictures of smoke: thick smoke, add firewood and fire; green smoke, seal the fire; all green smoke, turn off the fire to cool. In fact, this is the secret of smoking viewing that the leader of the charcoal workers just told him. In the end, the young man painted the vertical firewood shape, and let the charcoal workers figure out how to place it.

The samurai and craftsmen waited quietly around, in awe. After a long while, His Highness finally finished the enlightenment.

Shiloh waved to the leader of the charcoal workers, and the other party stepped forward respectfully with a smile.

"your name?"

"Your Highness, I am Koscachi of the capital city in the lake."

Koscach's face was covered in dirt, and he couldn't tell his age, except for a bright smile. His voice was low and hoarse, probably caused by long-term smoking.

Shuluo nodded, the charcoal profession ignored by the alliance, the background of ordinary civilians, flexible and knowledgeable about numbers.

"Koscachi, I have a military mission for you!"

Hearing that it was a military mission, Koscachi shuddered. He lowered his head and covered his face, his face bitter.

"Look up and look here! This board is a new-style charcoal kiln designed by me. You have to build it according to the shape above, paying special attention to the fire and flue! As for the specific size and details, I will leave it to you to explore."

Hearing this, Koscachi's eyelids flickered. His Highness has only been here for an hour, and he gave some new designs! I have been doing it for twenty years, and I don't dare to change it arbitrarily!

Xiulott looked at the expression of the leader of the charcoal worker, and felt that the other party didn't quite believe in the blueprints he had worked so hard to design. In this case, the boy spoke dignifiedly again.

"Koscachi, the alliance requires you to build five new charcoal kilns within a week, and then fire them one by one. The general shape remains the same, and you can adjust the technical details. No matter what method you use, one month Inside, your charcoal yield must be 40% of dry wood! Excellent charcoal should be half!

If you reach the standard, I will promote you as a senior craftsman of Shenqi Institute, and if you exceed the standard, you are a master craftsman! And if there is only 30% of the wood to be whipped once, you will end yourself! "

In Shilot's view, this standard is not strict. In later generations, the charcoal production rate of dry wood in charcoal kilns can reach 50% and 75%, and the Daming charcoal industry at this time can also stabilize at about 50%. With his own design guidance that spans the ages, what the leader of the charcoal industry needs to achieve is only the details.

Hearing His Highness's strict order, Koscachi's eyelids trembled violently at first, and then his whole body trembled. His Highness put the wooden plank with the mission objective on it, ruthlessly into his hand, then turned and left grimly, heading to the adjacent brick kiln workshop,

The old warrior Etalic gave Koscachi a fierce, deep smile. Then, he stretched out a strong hand, patted the leader of the charcoal worker on the shoulder, and gently brushed the other's fragile neck, and continued to leave with a smile.

Smoke was still rising from the top of the mound, but Koscachi was cold. The skin on his neck was scratched by the calluses of his fingers, and he suddenly got goosebumps.

The leader of the charcoal workers stood still, trembling slightly, like a crow stunned by a kestrel. It wasn't until the figures of His Highness and the warriors were gone that he suddenly turned around and jumped up, scolding the surrounding charcoal workers with a hoarse voice.

"You lazy blackbirds! From today onwards, let me sleep in the kiln! If you can't accomplish His Highness's goal within a month, I'll pluck your bird feathers first!"

In the sky, a wise crow was attracted by the smoke column on the ground, came happily, hovered over the heads of the lively charcoal workers, and chirped like a accompaniment.