Later, Zhu Linmiao briefly told Mu Zhiqing about the process of building a canning factory and producing canned food.

In fact, this method of steaming and canning is extremely simple, just keep it as clean as possible. The biggest technical difficulty is the sealing with wax, and even this difficulty will disappear after the mass production of rubber seals in the future.

It wasn't until noon that he finished telling the cannery.

After the two had lunch together, Zhu Linmiao rushed to the East Courtyard to check the experimental situation of vulcanized rubber.

Although the pot of rubber last night successfully completed vulcanization, the elasticity and hardness are very poor, depending on how the next few pots are.

Yao Qisheng and the others saw that the auxiliary king was coming, and they nodded hurriedly.

This is also what Zhu Linmiao ordered, and there is no need to be polite during the experiment.

He glanced at the vulcanized rubber products neatly placed next to him, turned his head and asked Yao Qisheng: "How is the situation of these batches of rubber?" ”

"Back to Your Highness, nine pots have been released. The students found that about one and a half times of sulfur and dry steaming for four hours were the most suitable. Yao Qisheng respectfully presented him with a copy of the experimental results, "In addition, the students also noticed that the vulcanization effect is better when the seal is sealed. The vulcanization rate of raw rubber varies depending on the thickness. Now we are testing it again and again with more sizes of raw rubber. ”

Zhu Linmiao first picked up the vulcanized rubber marked "four hours, one and a half", and broke it vigorously, and could already feel that it was far more elastic than raw rubber. It's barely enough to make solid tires and the like.

He looked at the experimental records in his hand again, and saw that the data were all neatly arranged in a table according to his requirements, and the time, temperature, sulfur ratio, and weight of raw rubber were extremely fine.

He nodded with satisfaction, believing that it was only a matter of time before the best vulcanized rubber parameters were tested with such rigorous and meticulous experimental methods.

On the side, Wen Xinping held more than a dozen black and yellow rubber rings with numbers written on them, and said: "Your Highness, this is the 'sealing ring' you want, which has been treated in different vulcanization methods, please take a look." ”

Zhu Linmiao's eyes lit up, and she hurriedly took it over to take a closer look, and several of them had quite suitable elasticity and hardness. He couldn't help but be interested, and ordered Yao Qisheng and the others to continue the experiment, so he took Shi Lin to the Dragon Guard camp outside the city.

Chen Xiongfei had already been notified by the soldiers who had arrived in advance, and was waiting outside the camp. When he saw Zhu Linmiao coming, he hurriedly saluted and said, "My lord, the cannon has been prepared on the barren slope in the north. ”

"Okay, let's try it now."

"Yes!"

The artillery battalion had placed martial law several miles near the barren slope, and three No. 1 Franc machine guns were placed under the slope.

Zhu Linmiao stepped forward to remove the gun of a cannon, placed a rubber sealing ring at the junction of the gun chamber and the gun gun, and put the gun back.

The Furlong cannon is like digging a gap in the body of an ordinary gun, and the sub-gun is the missing part of the gun body. This design allows a gun to be equipped with multiple guns, and the gunpowder and shells are loaded in advance in the guns.

When firing, you only need to jam the sub-gun in the gap at the rear of the gun, and the gun can be ignited immediately. And after firing, you can continue to shoot with another sub-gun. Since there is no time to reload, the rate of fire is extremely high, and it can even reach an astonishing speed of seven guns in a minute!

But the Furlong cannon had a fatal flaw. Due to the processing accuracy of this era, the combination between the gun and the gun body is not tight, and a large amount of high-temperature and high-pressure gases from gunpowder combustion will leak from here, resulting in very limited range and power. In the past, the effective firing range of the Franc cannon was only more than 200 steps, which was very weak.

However, at present, Zhu Linmiao has the "artifact" of rubber seals, which can greatly improve the "air leakage" problem between the gun and the barrel.

Because of the gasket of the sealing ring, it took him a lot of effort to push the gun in, and then took a few steps back, signaling the artilleryman next to him to continue the operation.

Chen Xiongfei personally stepped forward to command, ordered the muzzle of the gun to be flattened, and then the command sword in his hand fell, and said loudly: "Release!" ”

There was a loud bang, and the previous situation of sparks overflowing near Zi Gong almost did not appear, and the cannon body slammed back, retreating nearly a foot away.

Immediately, a puff of dust rose from the dirt slope in the distance. A soldier of the artillery battalion rushed to measure it with a knot, and soon ran back and said, "Report! The cannonball fell one hundred and fifty zhang away, and rolled out nine zhang! ”

One hundred and fifty?! Zhu Linmiao calculated in his heart, that is to say, this cannon can shoot at the enemy a mile away from fifty meters!

Chen Xiongfei and the other artillerymen were also shocked when they heard the "one hundred and fifty zhang" - what kind of immortal trick did His Highness use, which almost doubled the range of the Franc cannon in an instant!

These Franc cannons used to be the chicken ribs that the Dragon Guards looked down on, but now they have reached a range of nearly a mile, and they have a terrible rate of fire of six or seven rounds a minute, which is simply the "machine gun" of the seventeenth century!

With the help of the sealing ring, the thirty Furlong cannons of the artillery battalion were gathered together and shot, and the dense "bullet rain" could definitely sweep away "not a single inch of grass" within a mile!

Zhu Linmiao suddenly remembered something, and hurriedly said to the gunner: "Quick, first remove the Zi Gong and clean up the cannon barrel!" ”

"Yes!" The two gunners quickly unmandled the guns. Zhu Linmiao stepped forward to watch, and sure enough, as he expected, the rubber sealing ring had been deformed under the high temperature of gunpowder, and part of it was stuck to the joint between the gun body and the sub-gun.

He took out the knife he had prepared and scraped the rubber residue, but fortunately, the heat softened the rubber and it was easy to clean up.

It seems that every shot fired will cost one seal. He thought to himself, but compared to the improvement of artillery performance, this little cost is definitely worth it! When the vulcanized rubber plant is put into production, how much does this kind of sealing ring not as big as a bracelet cost?

He handed the rest of the seals to Chen Xiongfei, briefly explained the principle, and then asked them to test and record the shooting effect of each seal one by one.

Soon, the sixteen or seventeen rubber rings were all exhausted in the rumbling cannon, and Chen Xiong flew over and saluted: "Your Excellency, you have tried it all." The No. 11 sealing ring can increase the distance of the cannon to more than 10 kilometers away. The second lap was the worst, with a distance of only 130 feet. ”

This sealing ring is too soft and easy to be broken by gunpowder gas, too hard to achieve the best sealing effect, it seems that more testing is necessary. Zhu Linmiao nodded and wrote it down, and rushed back to the original Lu Wangfu to tell Yao Qisheng the test results, and asked them to make a batch of sealing rings according to the process of the No. 11 ring under laboratory conditions.

For the time being, a range of one mile is enough.

……

"These guys are simply not enough to succeed and more than to lose!" Hong Chengchou slammed the stack of pamphlets in his hand to the ground, these were the courtiers sent by Dudorgon to impeach Hong Chengchou.