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As the night deepened, the preparation rooms inside and outside the laboratory were brightly lit, and the staff were busy preparing for the preparation of medicines.

The specific drug for kala-azar is sodium antimony gluconate, the main raw materials are antimony and sodium gluconate, and the secondary materials include chlorine, sodium hydroxide, hydrogen peroxide, and methanol.

Yang Tianfeng was confident that he would be able to make the medicine overnight, not only the production process he had found in his head, but also the two main raw materials he had taken from the arsenal.

China is a major producer of tungsten ore and antimony ore, and both of these minerals have strategic value and are important raw materials for military production. Needless to say, tungsten, antimony alloyed with lead and tin can be used to improve the performance of welding materials, bullets and bearings, and is also one of the minerals designated by Yang Tianfeng to purchase from the rear.

If the steel surface needs to be chrome-plated, tin-plated, nickel-plated to adapt to special purposes, the surface of the billet needs to be strictly cleaned to make the coating firmly combined with the steel surface, and sodium gluconate is usually added to the cleaning agent to achieve the desired effect.

Although sodium gluconate could not be produced in China at that time, the process was not complicated, mainly because the fermentation method was time-consuming. The simplest production method is to use substances containing glucose (such as grains) as raw materials, and use fermentation to first prepare gluconic acid from glucose, and then neutralize it by sodium hydroxide to obtain sodium gluconate.

"These sodium gluconate were bought from Hong Kong, and the amount was not much, so I originally wanted to use them as a sample to provide various indicators for production and manufacturing. However, it is sufficient to make a small amount of the drug. Yang Tianfeng pondered for a moment and said: "In the future, the laboratory will have to produce its own products, and I will take it out soon." ”

Professor Hao is convinced of this, the laboratory has a lot of information provided by Yang Tianfeng, and the personnel and equipment are constantly expanding, and he feels sincerely proud and proud to be able to walk in the forefront of domestic research, fill the gap in China, and save the lives of thousands of Chinese people, and even more enthusiastic about the work that cannot wait.

Yang Tianfeng dictated, Hao Jiaqi recorded, the process of preparing sodium antimony gluconate formed a written data. Professor Hao and others read the information, discussed the key links with Yang Tianfeng, and then put on protection and entered the laboratory to work.

Although Yang Tianfeng did not directly participate in the preparation of medicine because of the injury in his right arm, he was not idle. Recently, he has been busy commanding and fighting wars, and the production situation of the arsenal and aircraft manufacturing departments needs to be reported, and there are many problems that need his guidance and solution.

It is not that these problems will always exist without Yang Tianfeng, but time waits for no one, Yang Tianfeng's knowledge and methods can solve the problem in the fastest and simplest way, and speed up the pace of manufacturing.

One more bullet production line has been added, and another is being manufactured in the county so that the troops can be equipped with more slaughtering chainsaws. Coupled with the guns and ammunition drawn from the First Theater, there is no sign of a shortage of ammunition in the Third Column.

Of course, this is relative. Compared with the 120 rounds of ammunition carried by the devil alone, the third column can't even reach half. However, during the Anti-Japanese War, the ammunition of the National X Army was 30 rounds per soldier, and the ammunition of the Eighth Route Army was only 3 to 5 rounds.

In fact, the simplest and most basic quantity of ammunition to be produced is to look at the overall national strength, and to put it bluntly, it is to look at the production level of the country. China was not an industrial country at all before the war, and war is the best test of whether a country's industrial base is solid.

The number of bullets can also be seen as the difference in firepower or the length of continuous combat in some respects.

Also because of the limitation of ammunition production capacity, and the current army is still in the process of continuous expansion, although the production capacity of the arsenal is improving, the pressure of ammunition for replacing automatic weapons is still huge. Therefore, Yang Tianfeng has not come up with drawings and materials for semi-automatic and automatic weapons.

All-out production of weapons and ammunition for the existing equipment of the troops, and use excess production capacity to develop new weapons, this has always been Yang Tianfeng's requirement for the arsenal. At present, the problems encountered by the arsenal are mainly concentrated in the two areas of recoilless guns and rockets.

The recoilless gun is small in size, light in weight, simple in structure, and easy to operate, similar to a steel fist or a bazooka, but the range and power far exceed that of a steel fist.

Yang Tianfeng wanted to make a recoilless gun, mainly based on two considerations.

The first is to deal with Tada Jun's "cage" policy, which has the ability to destroy devil turrets and pillboxes. Infantry guns and steel fists also have such an effect, but one is slightly larger and the other is too close in range, so they are not the most ideal weapons.

The second is to increase the power of striking devil armored targets. The range of the steel fist is only a little more than 100 meters, and it often needs to be covered by terrain, buildings, etc. Especially in positional warfare, the steel fist is very passive against tank guns and machine guns. If there is a recoilless gun, the distance of direct armor-piercing shells can exceed 500 meters, and the maximum range of anti-personnel grenades can reach more than 6,000 meters.

It is flexible, powerful, long-range, and relatively easy to manufacture, and the technical level of the arsenal can basically meet the needs of production and manufacturing. This is Yang Tianfeng's comprehensive analysis and judgment, and although there are difficulties now, they are not unsolvable.

“…… The key to the problem is the symmetrical vent at the edge of the bolt, the axis of the vent should be in the same direction as the rifling rotation, when the gunpowder gas is ejected from the vent, the torque generated should be just enough to offset the torque generated by the rotation of the shell on the rifling, and the recoil can be counteracted when fired, and the rotation of the gun body can also be prevented......"

Yang Tianfeng wrote down the guidance with his left hand, looked at the somewhat crooked words, and couldn't help but smile bitterly and shook his head, it's really not used to writing by hand!

Footsteps sounded behind him, and Yang Tianfeng didn't care. The security level of the laboratory was high, and his guards were added outside, and strangers couldn't get in at all.

It's just that the person who came passed behind him and went around to the other side of the table, and Yang Tianfeng was still a little surprised after seeing who it was.

Zhao Yuqing! The expression on her face was serious, though not quite commensurate with her age and experience.

Yang Tianfeng was only stunned for a moment, then returned to normal, watching Little Soap pull over the chair and sit opposite him, staring at him.

"How's the drug made? They wouldn't let me in. Zhao Yuqing asked a little stiffly.

Yang Tianfeng pursed the corners of his mouth slightly and said, "If it goes well, it can be prepared tonight." During the preparation process, toxic substances are produced and can be dangerous without protection. (To be continued.) )