Zhen Qian really wanted to get the sextant out, but the production process of the sextant was not just to draw two strokes with drawings, the indexing arc, the index arm, the moving mirror, the fixed mirror, the telescope and the micrometer wheel, which of these parts did not need to reach more than millimeters, and the requirements for optical accuracy were even stricter.

Since you can't get a sextant for the time being, it's not bad to draw a star map first and perfect the astrology.

The navigation technology of this era is not generally backward, of course, this is the result of Zhen Qian's observation, there is naturally no soft sail with wind from all directions, and every time you go to sea, you either rely on monsoons and ocean currents, or use manpower oars when there is no wind.

You can imagine how much cargo a sea ship below a thousand stones could carry in the Tang Dynasty, when shipbuilding technology was not very developed.

Even Zhen Qian was vigorously developing flyships at this time, even if he knew more advanced technology, what could he do if he couldn't build it.

Rome wasn't built in a day!

In addition to the slow accumulation, what else can Zhen Qian do?

Fortunately, Zhen San's understanding is good, as a native of the Tang Dynasty, without suspecting Zhen Qian's madness, he can accept some knowledge of later generations, what else can he demand.

Zhen San turned Zhen Qian's crazy ideas into crazy realities one by one, and the observatory was built to improve the star map, but in other people's hearts, it was another idea, but Zhen Qian and Zhen San didn't bother to think about it.

In fact, Zhen San's craziest idea is to build a reservoir, the Wufeng Islands are mountainous, Zhen San uses the advantages of the terrain to store the water in the rainy season, and then builds a canal to lead the water from the mountain to the bottom of the mountain, uses the drop of the mountain to drive a large waterwheel, and drives a giant machine to carry out hydraulic forging and processing, which completely subverts many people's worldview.

When Zhen San took out the engineering model, the lake formed by the surrounding mountains alone made many people lose their eyes all over the ground, and it was regarded as a whimsical and arrogant move.

It's just that in Zhen Qian's view, Zhen San's design is not as good as some small reservoirs in later generations, and his vision is different, so he naturally can't look down on it.

There are many people who have ideas in this world, but there are very few people who can realize their ideas, Zhen San built the reservoir to build weapons and equipment, if he relies on manpower, Zhen Qian is afraid that he will not be able to see the artillery fleet until he dies.

"This is the drawing of the seed machine and the loom, you take it back and see it first, if there is anything you don't understand, ask me?" Zhen Qian said irresponsibly.

Zhen San had long been accustomed to Zhen Qian's inexplicable drawings for himself, and after looking at them, he was suddenly stunned, and looked at Zhen Qian with a somewhat strange expression: "Master, it seems that you haven't finished drawing this drawing?" ”

Zhen Qian took it and looked at it, his face was embarrassed, and he didn't know when he stuffed the drawings of the bicycle to Zhen San.

"I drew it with my hand!"

"What if I believe you?"

Zhen San has seen too many unbelievable drawings of Zhen Qian, including big birds flying in the sky, ships sailing in the water, and carriage......s running on tracks, although he has not figured out what kind of creations those are for the time being, but he knows in his heart that those must be the secrets that Zhen Qian does not pass on.

"The master has a whimsy, how can he scribble casually, even if it is unintentional, it must be a flash of inspiration, and what ...... comes up in his mind, well! …… Hey! This...... The two-wheeled machine is very delicate, and although the structure is simple, it is cleverly conceived, let me think about it! ”

Zhen Qian was speechless.

This Zhen San can also pat on the back, how could he never find out before, Zhen Qian knew, it's not that Zhen San can't say that he can't talk about slapping horses, but now Zhen San's vision is too high, and it is difficult for ordinary things to arouse his interest, so he is naturally stingy with words.

Zhen Qian thought about it, the drawing of the bicycle just now was too complicated, not to mention the chain, that is, the bearing with thorn teeth could not be manufactured on a large scale, thinking of this, he drew a few strokes on another piece of paper at random, sketched out the original bicycle and handed it to Zhen Sandao: "The bicycle seems to be simple, but the required process accuracy is not low, I have a simple drawing here, you take it back and study it, see if you can make it first?" ”

Zhen San already has the character of a craftsman in later generations, took a look at the original bicycle drawings, and then looked at the first exquisite bicycle drawings in his hand.

The early bicycle is said to be a manuscript left by Leonardo da Vinci at the end of the 15th century, and it is no longer known whether it was made or not, and the structure is so simple that later generations can smack it, but it is the prototype of the earliest bicycle.

It is said that the first bicycle was made by a French man named Sifrac, and one rainy day, he was walking on the road, in order to avoid the four-wheeled carriage, he was splashed with muddy water by the passing carriage, it was because of this muddy water that he suddenly thought that the carriage was too wide, what would happen if four wheels became two wheels at ......the front and rear.

So Sifrak began to study, and soon the first "Wooden Horse Wheel" car in history was born. The car had two wooden wheels at the front and rear, with a beam attached to it and a bench mounted on it, like a toy. Although this "Trojan Horse Wheel" has neither a transmission chain nor a steering device, it is generally considered to be the earliest bicycle of mankind.

More than ten years later, a German forester Dress also made a two-wheeled car, and he added a handlebar to the front wheel to control the direction, which could change the direction of travel. However, when riding, you still need to use two feet to push the bike forward.

Later, Macmillan, a blacksmith in England, improved on the wood-wheeled car invented by Dress. He attached a crank to the axle of the rear wheel, and then connected the crank with the front pedal with a connecting rod, and the front and rear wheels were made of iron, with the front wheel large and the rear wheel small. In this way, the person's feet finally really leave the ground, and the alternating pedaling of the feet drives the wheels to roll the vehicle forward.

Until the end of the 19th century, the Englishman Rosson ingeniously installed chains and sprockets on bicycles, and used the rotation of the rear wheels to propel the bicycle forward. A truly modern bicycle is born.

The development of the bicycle has also gone through a long process, the development of mechanics and kinematics has changed the structure and performance of the bicycle, the front fork and brake are installed, the front and rear wheels are the same size, the steel pipe is used to form a diamond-shaped frame, the use of rubber tires, etc., even if Zhen Qian can draw accurate bicycle drawings, Zhen San can not make bicycles in the modern sense of the future.

"Don't think about it too much, the food should be eaten in one bite, the road should be walked step by step, the biggest significance of the emergence of bicycles is to replace walking, improve the speed of walking, reduce the use of horses, and facilitate travel ......."

(End of chapter)