The practical observation of artillery coordinates finally began after a few days of theoretical learning.

The reason why it takes a few days is because many warriors don't know anything about trigonometric functions......

I once heard a joke about a guy grabbing a pair of scissors and trying to cut his nails, only to find that the scissors were not good for sharpening ...... At this time, I found that the whetstone was gone, so I went to buy it, and when I bought it, I found that I had to make a bottom seat for the whetstone, so I had to go up the mountain and cut down trees...... There are a lot of horns, and Zuihou has forgotten what he was going to do.

Wu Dengxiong, the commander of the artillery battalion who was responsible for the calculation of coordinates, encountered such an incident...... When it comes to trigonometric functions, we find it necessary to talk about the basic theorems of triangles, and when we talk about the basic theorems, we find that there are still people who don't know what angles are...... When I talk about angles, I find that there are still people who don't know how to multiply......

So this process almost made the artillery battalion commander vomit blood in anger...... After a few days of lectures, I was so angry that my face was bloodless, my eyes were straight, and I said vigorously: "I said the battalion commander...... This learning coordinates has to be a bit basic, just like a series of lectures, these two are ......"

"No way!" I said, "This is not negotiable, and it must be taught if it is not taught, otherwise what if you need to call for artillery support when you go to the battlefield?" ”

"That'...... Isn't there an artillery observer? Wu Dengxiong was still a little unwilling.

"How many artillery observers are there?" I said, "What if the artillery observation is killed or wounded?" You just want us to blow up the devils in a row, right? ”

"You...... What is this to say...... "Wu Dengxiong didn't dare to say anything anymore because of me like this, just kidding, our second company is a hero company...... Do you dare us to blow up the devil twice? It's the knowledge of making mistakes. In this day and age...... Everyone is afraid that others will put a hat on themselves.

So Wu Dengxiong had to walk up to the podium with a green face.

But it still doesn't make sense...... The fighters are too weak in base. Some don't even know how to multiply. How do you let people learn this trigonometric function?

All right...... I saw that I couldn't hold on anymore, so I stood up on the podium and said, "Comrades, do you know what the use of learning this is? ”

"Count the distance!"

"Report the coordinates!"

……

"That's right!" I said, "You know the use, but do you know it...... What do I want you to learn? ”

The soldiers under his command were dumbfounded, and it took a long time for someone to answer: "Isn't it for the artillery comrades to indicate the target?" ”

"You can say yes or no!" I pretended to sigh helplessly: "Look at ...... Our battalion has an artillery battalion, a mortar battery. A total of several dozen cannons...... I'm still wondering which class and which platoon will learn how to report the coordinates...... I'll divide it into a few cannons, and now it seems ......."

"Battalion commander! We learn ......"

"Battalion commander, we'll be there soon! Give me a little more time! ”

……

Before I could finish speaking, the warriors grabbed it like something...... This is not good for gold and silver, just like this kind of weapon that can save your life on the battlefield, not to mention that you still have a few cannons for them.

So that enthusiasm was mobilized at once, and the multiplication mouth would never be able to do it, and it was immediately recited ...... If you don't sleep, you have to memorize it. Multiplication will not be, and the questions will be calculated one by one. If you don't eat, you have to finish the question. The soldiers of Liang Company even gave a death order to their soldiers: If anyone drags back our platoon, the artillery of our platoon will be lost. Lao Tzu cut off the stuff in his crotch and used it as a gunner!

As a result, within a few days, I actually gnawed down this trigonometric function......

This made Wu Dengxiong complain in front of me with a bitter face: "Battalion commander! Didn't you use this method earlier? I have suffered so many days of sin in vain! ”

Alas! Didn't I just think about it?

Of course, I believe that many of them still know it but don't know why, that is, they memorize the formula by rote and then put the data into it.

But then again, our purpose is to fight a war, so that the shells will be accurate, so as long as you can calculate correctly, you will know how to calculate it, regardless of whether he really understands it or not!

Then go to the field to make field measurements, and the first thing to do is to calculate the distance between two points, that is, the length......

Of course, this length cannot be measured with a meter ruler, who will give you the time and opportunity to measure it with a tape measure on the battlefield...... This artillery naturally has the methods and tools of artillery, and this method is either trigonometric functions, and the tools are what they call "steering wheels", "rods" and "calculation wheels".

I've seen this steering wheel and pole in modern times, and I often see people aiming at this thing when building a house......

Now I know that this thing is measuring angles...... For example, if you want to measure the distance between points A and B, of course, you can't directly read the distance between points AB with the steering wheel.

The method is to construct a triangle, for example, insert a red and white rod on the right or left side of point A at a distance of tens of meters, assuming that this rod is point C, so as to form a triangle composed of three points A, B, and C, and the length of AC is known.

Then use the steering wheel to aim at C from point A and B, so you get two angles...... Well, knowing the two angles of the triangle and one side, you can find the length of any side of the triangle, what sine, cosine, tangent, cotangent theorem, turn a few times on the calculation disk, and then add, subtract, multiply and divide a flip, and you can get the distance of two points AB.

The calculator is a mechanical calculator used to calculate the value of the sine and cosine...... There is an aluminum disc about 20 centimeters in diameter, engraved with dense scales, and if you adjust this scale to the desired degree, the two plastic hands will point to the corresponding sine cosine......

As for tangent cotangents...... Anyone who has read the book knows that the sine and cosine are reversed and reversed.

Liang Lianbing was stunned and didn't believe that he could calculate the length in this way, and kept saying that it was fake...... How is it possible, just take a picture with this ghost, and you can know the distance between A and B, even if you don't measure two points? And then he was really serious...... I actually found a rope to pull from point A to point B, and then measured the length...... Hey, shouting: Fuck shit!

Of course, the distance between points A and B cannot be the enemy's target, because if the enemy's target will be aimed at you with the steering wheel, then do you still need shelling?

Therefore, both points A and B are on the trenches on the opposite side, and it is easy to calculate the length of this AB, and the observers of the two points are aimed at the same target of the enemy on the opposite side at the same time...... Soon two angles were obtained, and then the exact distance of our position from the enemy target was calculated from the length of the two angles and AB......

All right! If the artillery positions in the rear at this time know the coordinates of our positions, then the coordinates of the enemy's positions are calculated with this distance and angle. If you don't know, use a known azimuth, such as a certain high ground with a known coordinates, and calculate the distance in the same way.

Of course, if you want to carry out shelling, you also have to calculate the elevation of the target...... The shell is a parabola, so it's useless to know the coordinates, because the impact point of things at different heights of the same coordinate is different. The same method is used for this elevation, in short, this triangle is turned upside down, and after a few times, the enemy's coordinates and elevation can be calculated.

In principle, it is very simple...... In the end, it comes and goes: know the two angles and one side of a triangle, and find the length of the other side...... I believe that anyone who has learned relevant knowledge will do this question.

But...... It's not that easy to do.

The difficulty lies in measuring the angle of the target...... It's not that hard to measure, just aim the steering wheel at the target and read the reading.

Here's the difficulty...... There must be two people who read the angle of the same target at the same time at two points in AB...... And it is very likely that these two points are still far away.

Therefore, AB must first be able to contact two points, either by walkie-talkie or by pulling a telephone line.

Then A is subjective...... The full name is the main observation point, and it sends a message to the side view (side observation point): "Aim at the enemy bunker about 10 meters to the left of the pine tree......

This sentence sounds like an easy sentence, but in fact, you may be stunned when you look at it from the side: pine tree, which one of those pine trees are there? Left...... It looks left in your direction, but it looks right in my direction......

So after looking for a long time, I couldn't find the dark castle that the subjective point of, and it was even possible to find the wrong target and get a completely wrong coordinate.

Only then did I realize that artillery observers were really not simple, according to Wu Dengxiong's words...... This requires long-term cooperation between artillery observers, and there is a clear understanding between the subjective and the sideways, which is more tacit than between husband and wife...... A few words can make the sideways understand which target to capture and react quickly.

And that's not all, the most important thing is that all these actions have to be completed in more than ten seconds...... Subjectively describe a target through the telephone to the side, the main and sideways steering wheels aim at the target at the same time, the sideways report the readings to the subjective, and the subjective calculates the required data according to their own readings plus the readings on the sideways report with the assistance of the assistant pulling the calculation wheel, and immediately calculates the distance of the target with the distance of the two points known AB......

How is this done?!!

I couldn't help but be dumbfounded...... Especially the zuihou step, the previous step can also be said to be practice makes perfect, this zuihou step to calculate the length of the other side with two angles and one side...... Can it also be calculated in seconds? Modern computers also take time to input data, and it is not possible to do it in a few seconds.

Note: This is the method of artillery observers in the 70s, modern times there are laser rangefinders that can be used. (To be continued......)