Those who used to break dry batteries when they were kids, remember the black carbon bar in the middle -- it's a common thing to draw circles on the ground at that time, or to be stronger than a little partner. But you know what? It's such an ugly little thing that it was almost impossible for a radio man to use the ground during the war。
At that point, both the japanese and the chiang army were staring at the ground, and dry batteries were not allowed in. To be honest, they're just afraid that we're going to use the radio — after all, there's radios in the brigade and above, no dry batteries, a piece of scrap metal. It's been a long time since you've been able to use used batteries for salt water, or use needles for ammonium chloride。
I couldn't do it. I had to do it myself. In 1942, people at the yanan materials plant began testing, and out of 17 raw materials, all but two of the powder was purchased from shanxi, and the rest was self-made. Zinc skin, for example, is used for civilian copper — copper zinc, which is not the same melting point — the tea factory heats it with a cement kiln, separates the zinc from the copper, turns it into zinc, then presses the skin required for dry batteries with a new machine。
Where's ammonium chloride? Either human urine fermentation and lime evaporate ammonia and react with hydrochloric acid, or the rest of the oxen and sheep horns of the button factory are used to heat the ammonia gas in close proximity. Look, it's all around you。
The most painful is the carbon bar. You mix it with coke powder (barrel hard), graphite powder (barrel conductor) and asphalt into a noodle, then you squeeze it with a machine. But at that time it was used to prolong the asphalt of the oil fields, which was thicker than any other, and did not squeeze the mold. What do we do? Somebody put sugar on it. Don't laugh, it's working. Add an eighth percent of sugar, it's soft, it's good。
At the end of the day, there's no easy way out of this. It was all forced out. Smelting zinc from copper money, making ammonia from human urine and making asphalt with sugar is a way to get dirt out of every step, but it is the way to get the radio moving properly and the message out. In fact, sometimes things that seem difficult to do can be of great use — after all, living and working。
