Hou Dongfang, as the representative of Zhang Guoan's island lord, was warmly received by Pingzhang Jia Nidao after arriving in Lin'an City. Pen & Fun & Pavilion www.biquge.info

In fact, Pingzhang Jia seems to like this tall young man very much, and that Zhang Guoan businessman really has a vision.

The conversation between the two of them was very smooth, and the attitude of both parties was extremely friendly.

After Pingzhang Jia seemed to hear Hou Dongfang say "My Zhang Island Master" three times in a row, he suddenly understood that the other party had always wanted to own Liuqiu Island...... After hearing this, he wanted to laugh in his heart, what is there to be nostalgic for an overseas desert island?!

Let Da Song live a good life, but you have to live on an overseas desert island?!

Well, people who are not my Great Song really think differently...... Pingzhang Jia Yidao immediately made a clear statement, fully agreeing with the title of Zhang Island Master, and admitting that the other party completely owned Liuqiu Island.

The owner? Hehe, it sounds similar to the king of the mountain...... But it's not under the rule of my Great Song Dynasty, whatever they call it.

After the two sides clarified the core issues, their conversation deepened.

Hou Dongfang briefly explained the basic principles of rockets to Pingzhang Jia Yidao...... Because the reason is very simple, he quickly figured it out, and I can also create this thing by my Great Song Dynasty craftsmen!

Hou Dongfang nodded in agreement and said, "Ordinary craftsmen can build it according to the size, but this output can't be increased." ”

Ping Zhangjia said disappreciably: "I have countless craftsmen in the Great Song Dynasty...... It can be imitated! ”

Hou Dongfang shook his head and said, "It seems possible, but the black fire/medicine pillar is different from the usual, and some of the ingredients are obtained by my island master using the scientific formation." ”

Pingzhang Jia said casually: "This is easy to say, let your island owner sell more medicine pillars and ...... with me"

Hou Dongfang immediately agreed, this originally had the meaning of the owner of Zhang, and their Great Song craftsmen could always help solve some problems.

Subsequently, Pingzhang Jia Yidao complained that the output of Liuqiuyu was too small...... It's not that he didn't use the relevant products, but that the Great Song government got a lot of taxes from this sales process!

The Liuqiu Island area never took away the money from the sale, but purchased materials in the Great Song Market again, and in this back and forth, the Great Song Dynasty government collected taxes at both ends, and of course got benefits.

The behavior of the island could not help but attract his attention, because the amount of their transactions was really huge, and the amount exceeded that of ordinary large merchants.

It has become an economic phenomenon.

Many officials in the Great Song Dynasty have some insights into this economic phenomenon, although they still can't fully understand the truth of this, but at least some officials have thought that the money in the world may not be a fixed number, and it will not be as simple as you have more money and I have less!

Naliuqiu Island was originally an overseas desert island, and it can produce so many ...... Wealth can be created at will, right?!

In fact, the most studied phenomenon of convection on the island is the law of the military control of the former army of the Great Song Dynasty.

He has read the popular "Arithmetic in Primary Schools" and "Geometry in Primary Schools" in the Great Song Book Market several times, and he has a lot of experience in the study of lever theory...... At the same time, he used them in armament, summed up a few formulas, and made an adjustable stone cannon with the craftsmen in his arsenal, which could shoot at different distances, and the range could be estimated in advance.

They are also pondering the relationship between the size, weight and distance of stone or thunderbolt bullets, and are summing up a set of rules.

Zhang Guoan really didn't know that they were studying these, otherwise he would definitely help them from the side.

He didn't know how far this research would go, nor what strange results would come out, but it was a welcome phenomenon...... In terms of basic mathematics, the Great Song Dynasty may be the first country in human history to have a preliminary system.

Of course, this is far from enough.

Fa Ke also didn't know that Zhang Guoan was writing three books, "Primary School Physics", "Primary School Chemistry", and "Primary School Biology", which were all intended to be used as teaching materials like the previous two.

In the past few years, Zhang Guoan has never relaxed his education and teaching, especially those half-grown children, although they all have their own jobs, but in their spare time, they have to study, and even give lectures to people younger than them.

The basic principle of Zhang Guoan's writing of these three books is to establish a basic platform for exploring nature, which may be too low, but after all, it already exists.

He has been perfecting, so the law can be controlled by the book yet.

But the Fa Ke system cares about the goods produced by the flow of islands, not because they are easy to use and popular, but because they always make him feel novel.

With his current fortune, it is impossible for him to afford to buy Liuqiu jade products, but he didn't expect that he would be able to get the favor of Zhang Guoan's island owner, and he made a special trip to send him the same Liuqiu jade products, saying that they were called telescopes.

This product is indeed made by the craftsmen of Zhang Guoan.

He didn't have the ability to burn optical-grade glass at the time, but he could still improve the quality gradually, and when the quality of the product was very good, he asked the craftsman to polish the concave-convex mirror out of volcanic ash according to the size he had given.

He designed it directly as a monotube, slowly blended it, and packed it in a bronze tube.

He opened both eyes at the same time, and observed an object in a telescope with one eye, and directly observed the same object with the other eye, and at this time there was a clear difference in size between the object in the left and right eyes, and he compared the length of the object in the left and right eyes, and calculated, and the multiplier was about eight times.

He also asked the craftsmen to change to a shrinkable type, which can be used dual-purpose and is easy to carry.

Polishing the concave-convex eyepieces and objective lenses is a meticulous work, where did the craftsmen at that time dare to innovate, they strictly implemented the size required by Zhang Guoan, so after the first batch of telescopes came out, they were basically the same color.

After he distributed the binoculars to the personnel of the Liuqiu Guard squad leader and above, everyone reported that it was very good, and it would be better if they could see farther away.

This requirement is not difficult either.

The role of the telescope is not to bring distant objects closer, but to expand the angle of view.

Zhang Guoan's main design is the simplest telescope objective, the objective lens is in the front, it is a convex lens with a very long focal length, and the angle of light at the focal position is very small.

The eyepiece is a convex lens with a short focal length, and the angle of light rays at the focal point is large, when the focal points of the two lenses coincide.

Then it's easy to make the angle of view of distant objects in the eye larger, and the greater the difference in focal length between the two lenses, the greater the magnification.

Of course, this requires a long optical path of the telescope to achieve a large magnification.

This puts forward high requirements for the production of lenses, and after trial production, the most cost-effective multiple is about 20 times.

It's a half-meter-long one, a size that can only be used at sea.

After Zhang Guoan equipped his army and caravans, he began to consider selling to the Great Song army.

The best way to sell is not to give it to their official family, but to the military closest to it.

Fa Ke couldn't help but be overjoyed after getting the eight-fold telescope. (To be continued.) )