First update!

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The Military Weapon Bureau was also in an emergency expansion, and the apprentices collected 2,000. In addition to the craftsmen dug up everywhere, the number of the Military Weapon Bureau soared to more than 8,000.

This is a place that costs more money than the army. The monthly cost of investing in the military weapon bureau is more than 100,000 taels, of which labor costs account for 1/3. Being a craftsman is more profitable than being a soldier, and the income is higher. Not only does it increase income with the improvement of technology, but if a technology to improve productivity is invented, you can also receive a steady stream of rewards.

Glass mirrors are currently only sold as luxury goods, and although sales cannot be expanded for a while. However, the high concentration of production materials in the late Ming Dynasty led to a sharp increase in luxury goods consumption. At present, the big merchants in Shandong have fully distributed goods in the southern area, and earned more than 500,000 taels last month.

The rich people in the Ming Dynasty were everywhere, and their main source of income was land. A large amount of land annexed, and the wealthy households with a total of more than 100,000 mu of land reached more than 20,000 to 30,000.

Such large-scale land annexation has created a large number of wealthy households, but it has also created many farmers who have lost their means of production. The reason is that the land profit margin is too large.

Just like the speculation of housing in later generations, because the house has good profits, all the funds went to that area, resulting in the high housing prices.

In addition to the wealthy families who make a living by land, there are also many wealthy families who make a fortune by opening workshops, salt goods, selling, embezzlement and bribery, robbing families, and making a fortune in sea trade.

With so many wealthy households, luxury goods consumption will naturally not be low. It is estimated that monthly sales still have a relatively large room for growth.

In addition, those merchants kept transporting supplies to exchange glass mirrors, and the income last month was estimated to be around 700,000 taels. For a time, Zhao Yan was still relatively well-off, so he decided to expand his enrollment and expand the scale of the Military Equipment Bureau.

The artillery laboratory's research on artillery is still progressing slowly. So far, only the hydraulic spring-type frame retreat method and sleeve gun have been studied. Although the rifle has been created, it is very troublesome to create it. The rifle of a gun barrel must be drilled with a hook knife on a wooden bed for seven or eight days before a gun barrel can be produced.

This wooden pull-up bed is very simple, and early American colonists could have made it themselves. This tool was produced by using it as a front-loaded rifled gun, but it was much slower to put it on the cannon.

The artillery battalion is being formed, how can it be without artillery? Zhao Yan had to take action himself and enter the artillery laboratory.

Under Zhao Yan's command, after half a month of research, the blast bolt was made, eliminating the accident of loading ammunition afterwards. This was a technology that only appeared in the 19th century. The blast bolt was relatively complicated and it took a long time to make one.

There is no mechanization of productivity, which is slow and costly.

After being combined, a 75mm field cannon was pushed to the shooting range for test firing. Currently, the bullet body is cylindrical, so the bullet weight is not used, but it is changed to the caliber.

This 75mm field cannon has a diameter of 20 and a pipe length of 1.5 meters. It has been rifled, made of rear-mounted, cylindrical bullet body, frame backward, cast iron, and wrapped several circles of steel wire. The total weight of the gun rack is 630 kilograms and the bullet weight is 10 kilograms.

Compared with the artillery in later generations, it is extremely clumsy. The artillery in later generations with a diameter of more than 75mm can be carried on the shoulders and runs.

After a loud "Boom!", the shells flew out of the barrel smoothly. The craftsman hurriedly rode his horse to measure the range. After more than ten minutes, the results were measured.

The craftsman excitedly told Zhao Yan that the shot just now cost more than 2,000 meters.

"Continue." Zhao Yan was quite satisfied with this range.

After testing one after another, the effective range of this field cannon is about 1,200 meters, which is no worse than the range of the two-ton Red Cannon.

This is the effect of rifling. Those red barbarian cannons are also smoothbore cannons. They confirmed that the safety of the cannons was safe, so they abandoned the safety fuse and carried out continuous shooting.

It can shoot two shells in one minute, but it is good to shoot one shot in this era in two minutes.

It is not only because of the rear-loading, but also has a lot to do with the quantitative ammunition assembly.

With artillery technology in this era, artillery soldiers had to use a ruler to measure when loading medicine. At the same time, due to the front installation, the diameter cannot be too large, so the power naturally cannot be increased.

The 20-fold diameter is still a little less powerful.

This model of field gun is okay to use! The most important thing is the rate of fire and lethality. The rate of fire has been increased, and the lethality has to be relied on grenades.

The durch shot was invented by Henry Slapne of the British Royal Artillery in 1803. In more than a century, there was no better shell than this.

Mix shrapnel and iron beads with a small amount of gunpowder into the shell, and then ignite it with a fuse. After the shell is fired, it explodes within the time specified by the fuse, emitting a large number of shrapnel to kill the enemy. It is the most effective weapon against infantry and cavalry.

Because the friction between gunpowder and elixirs is sometimes exploded early. So the second time it was modified into a metal tube inserted into the shell, filled with gunpowder, separated from the shrapnel inside the shell.

The third modification was in 1840, and the iron partition was further installed at night and it was loaded into a cylindrical bullet body.

Grenades, also known as explosive bombs, can also play a powerful role in naval battles. The shells can be shot into the hull and then explode, causing secondary damage. At the beginning, the explosive bombs were considered to be naval combat weapons second to solid bombs. French artillery designed a cannon for firing explosive bombs. The gun body was short, light in weight, and used less medicine. In 1824, a second-deck warship was successfully crushed.

The demise of the Turkish fleet in Sinop made people realize the important surname of the bomb (grenade).

The production of grenades is not difficult, especially for a time traveler like Zhao Yan who is foresighted, there is almost no need to take detours.

But in two days, Zhao Yan designed the grenade.

"You can design a field gun according to these 10 kilograms of grenades. It is enough to hit the shells 1,000 meters away. You can make it as light as possible." Zhao Yan decided all these, as long as the craftsmen experimented according to different diameters, and finally decided to be the strongest man in the mobile surname.

The grenade designed by Zhao Yan is to deal with cavalry. The stronger the mobile surname, the better, and the range and attacking ability are not that important.

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Chapter completed!