Chapter 665 (1/2)

In this time and space, 1785 is destined to be an extraordinary year.

In the spring of this year, stone bear and huckleberry, who is already 18 years old, came to Norfolk, the east capital, again along the Shangdong highway, which has just been built for less than a year, under the protection of a group of guards.

Shangdong road is the main road from Shangjing to Norfolk. This trunk road with a length of nearly 1600 kilometers has been built for ten years. Along this road, you can go from Shangjing to Norfolk via gaoshu tribe and Daqingshan base.

There are seven similar trunk roads in Yanhuang tribe. They all start from Shangjing and then lead to the seven most important cities of the tribe.

The width of the highway is similar to that of the two-way two lane highway of later generations. The width of the highway subgrade is 13 meters, including the shoulder.

The subgrade is made of natural soil and covered with reinforced concrete and asphalt.

The road from Shangjing to gaoshu tribe is made of reinforced concrete, but the road from gaoshu tribe to East Norfolk is made of asphalt.

The tribe was able to use asphalt thanks to the dedicated work of Bill Gates, who has been studying oil in Buffalo, and his daughter Mary gates.

There are three kinds of asphalt, coal tar asphalt, petroleum asphalt and natural asphalt. One is that coal tar pitch is toxic, the other is that it is not produced much. The most important thing is that the performance of coal tar pitch is not very good. It is easy to break at low temperature and soften at high temperature. Therefore, although the tribe produced a lot of coal tar pitch during coking, it can not be used.

Petroleum asphalt is the residue after distillation of petroleum. The performance of petroleum asphalt is much better than that of coal tar asphalt, so when gates and his daughter developed the industrial refining process at the Petroleum Research Institute in Buffalo, they began to build large-scale refining equipment near Youxi State Park in the northeast corner of Pennsylvania, and a large amount of asphalt came out.

Then the roads built by Yanhuang tribe began to use asphalt.

As for the natural asphalt, although there is basically no toxin, the output of that thing is too small, so the stone bear can't afford to use the natural asphalt to pave the road.

At this time, the product of crude oil distillation was mainly kerosene used to make lamp oil. Of course, Shi Xiong also instructed gates and his daughter to develop a method of producing gasoline.

Although the stone bear knows the general structure of the internal combustion engine, and the scientific research team led by Jack Williams has also made the internal combustion engine, because of the material, the internal combustion engine can not run for a long time.

Internal combustion engines are easy to do, but key parts like pistons and crankshafts need excellent materials. Before the breakthrough of materials, the internal combustion engine was just a product.

But gasoline can be used in the military.

Kerosene and gasoline can be obtained by distillation of crude oil. The liquid gasoline can be turned into colloid by adding aluminum soap thickener into gasoline. Well, this kind of gelatinous gasoline is the basic raw material for making indescribable bombs

Now Yanhuang tribe has built a hard airship, but Shixiong doesn't want to expose it to Europeans, so hard airships are only used in the west, North and southwest. Of course, the bear Army Air Force under the command of black wolf is also equipped with a lot of hard airships.

Once the air force's hard airship takes part in the war, it only needs to fly the airship over the enemy, and then desperately throw down this indescribable missile, which can definitely make the enemy sour.