The gunboat slowly came to a stop. However, it did not drop anchor and continued to light the fire. It only disconnected the transmission system.
The water flow here was gentle, and the captain gave the order to tighten the right rudder. The engineers immediately controlled the two transmission shafts and connected one of them to power. The gunboat slowly turned around.
At this time, the bow heavy gun of the shallow-water heavy gunship was pointed at the hillside in the distance, and the two fixed rotating Gatling cannons on the left and right sides also pointed their muzzles forward.
At this time, the sailors were wiping the cannon and the cannon had cooled down.
On the hillside in the distance, a large number of Mongolian soldiers were gathering. Apparently, Gushi Khan was collecting the broken troops everywhere. They planned to compete with this damn black ship.
Since early morning, they had had enough of the boat's birdiness.
At that time, there were 30,000 people in Linhe City, and only about 9,000 escaped. The rest were burned to death there. There were still 20,000 people in various camps outside the city, and they were shot by machine guns in previous conflicts.
More than a thousand people died, and hundreds more were killed by artillery.
Gushi Khan sent out messengers to gather the scattered soldiers and horses, and gathered here to prepare for a good battle with this ship.
Currently, there are many castles on the crescent-shaped plain of Jacket, along the crisscrossing rivers. Such as Jilucai Castle, Yuhun Ancient City, Three Tent House Ancient City, Linrong Ancient City, Xinhure Ancient City, Gao
There are a large number of military fortresses such as Quesai Castle, Shujiang City, Shuofang County Ancient City, and Woye Town Ancient City.
These ancient cities are all left over from history. Although they are dilapidated, the basic city walls are still there, but many of the internal buildings have collapsed. This time Mongolia from the Desert invaded in large numbers, and various tribes were dispersed to various ancient city castles, and divided into
Pasture land should be kept separate for cattle and sheep to avoid disputes.
Among them, Linhe City is the largest part, where the leaders of the four tribes are stationed, hoarding all the food and grass. Originally, this place was the farthest to the west, farthest from Jiuyuan City, and was supposed to be the safest. Unexpectedly, Jiuyuan City sent people here
A black ship burned down the safest place.
The four leaders on the hill gnashed their teeth. They were not ready to run away at this time. It was just a boat, and they didn't believe they couldn't chew it off.
At this time, on the hillside, there were more and more Mongolians, densely packed cavalry, and in front of them slaves were nailing wooden planks to the Lele cart. They had more than a hundred small Franco machine guns,
and more than 200 camel swivel guns also caught up.
Yang Fan looked at where they were with a smile, boosting morale and building shield vehicles. He did not give any instructions.
"Uncle Dingyuan is so calm and calm, it seems that he has defeated them. However, there are many people on the other side. More than 20,000 people have gathered now. It is estimated that they will attack soon." Zhang Wudian said.
"Don't worry, Mr. Zhang, these shield cars, Fran cannons, and camel cannons are all useless. They don't know the performance of our weapons at all." Zhang Fan explained with a smile.
"Their Folang machines are all small-caliber, and they are too big for their camels to carry. The camel cannon is not big either. It is basically a large matchlock gun, similar to those big tubes in Japan. The maximum range is more than 300 meters.
It’s as high as the sky. If you want to hit the target, the effective range is only 200 meters.”
"They are now 3,500 meters away from us. Our heavy artillery can hit them at this distance. However, this is the maximum range and can only be ejected and cannot be aimed directly."
Zhang Wudian said: "If the artillery cannot be aimed directly, it will be difficult to hit the target."
In this era, there are no trigonometric functions and no way to calculate ballistic trajectories. Parabolic trajectories cannot be predicted, so there is no way to aim indirectly.
Therefore, the effective range of artillery is the maximum range of direct aim. Without optical equipment, it is difficult for the human eye to see clearly 200 meters away. Even in modern times, a rifle can be easily aimed with the naked eye and hit an object 200 meters away.
The targets are all excellent shooters.
Therefore, after World War II, assault rifles were eliminated, and rifles that used high-power fully loaded bullets. The effective range of 800 meters like the Mauser 98K has no practical significance. The 7.62X54mm bullet is large and heavy, and it also affects the ability to carry ammunition.
quantity.
In fact, the battle basically takes place at a distance of 200 meters to 300 meters. Long range is basically useless. At this distance, firepower density is often more valuable than precise shooting. The bullets are replaced by the Soviet 7.62X39mm bullets. The West also uses them.
Several intermediate-power bullets of different calibers were produced. Later, the caliber was reduced and replaced with smaller bullets.
"Mr. Zhang, you are a master of mathematics, but you may not have studied ballistics. Ballistics can be calculated using mathematical formulas. Coupled with the measurement and calculation of climatic factors such as wind direction, wind speed and humidity, it can be indirectly calculated through parabolic ballistics.
Aimed."
Zhang Wudian said in surprise: "Mathematics can also be used in artillery shooting."
Yang Fan said eloquently: "Of course, you see this is a shooting table. In fact, there is no need to calculate it on the spot. The table above has been calculated. Just adjust it according to the distance. You see, I will give you a show. Just face the one on the hillside.
How about a cowhide marquee as a goal.”
Zhang Wudian also came over, looked at it for a while and said: "This is not close, it is probably seven or eight miles away. Can the heavy cannon on the bow of the ship hit that far?"
Yang Fan put his hand in the back, thumbs up, and looked through the glare window. He closed one eye in turn and did some mental calculations. He said: "It's about 3,400 meters. We can hit it."
Zhang Fengyi asked in surprise: "Brother Yang, what is your method? You can calculate the distance with your thumb. Can you teach me? It's really amazing."
Yang Fan said with a smile: "The thumb range measurement used by artillery mainly uses the "eye-jumping method"."
"Based on the fact that the distance between the two pupils is about one-tenth of the length of one's arm, multiply the width of the measured object on the ground by 10 to get the distance from the standing point to the target."
"When measuring, the observer faces the target, extends the thumb of his right hand between the eyes, closes the left eye, aligns the target with the right eye through the side of the thumb, and then observes with the left eye through the same side of the thumb. Remember the left eye
With your eyes aligned with the object, estimate the distance between the object and the target, and then multiply by 10 times to get the target distance."
Zhang Fengyi was dumbfounded, it was so complicated, so complicated.
Zhang Wudian said with a smile: "Xiaoqing, grandpa always teaches you to read more and learn more. You just don't like to read and study. Uncle Dingyuan's method sounds simple, but it requires very advanced mathematical knowledge.
.You don’t understand. When you go back, grandpa will teach you the principles and you will understand.”
This method was originally created by Chinese artillery in modern times. This method has a large error and can only be used for rough estimation. In use, certain practical experience is required.
This method is also called the visual distance method, which is based on the principle of triangle similarity. The length of the arm, the height of the thumb or the pencil in the hand, and the angle between the line of sight and the top of the thumb or the pencil in the hand are known.
The far target is a tall, fixed mountain top or an object with an elevation on a military terrain map. In terms of its principle, it is derived from the principle of trigonometric functions, which determines the standing point and the target point.
Zhang Wudian is a scholar with profound knowledge in mathematics, so he can naturally understand it. Zhang Fengyi is good at wielding swords and swords all day long. If you ask her to study, she will run away long ago.