In the evening, the golden crow fell and the sky was dark. The sound of drums sounded everywhere in Chang'an City. If it were in the past, it meant that the curfew was about to begin, but now the sound of drums only told the residents in the city that the city gate was about to close.

In the cold wind, Yu Wen Wen stood at the top of the city, looking at the chessboard in front of him, looking at the straight streets, and then looking at the pocket watch in his hand.

At this moment, it was 17:18 pm. Because winter is now, the sunset time is earlier than before. According to the calculation of the Imperial Heaven Supervision, the sunset time of this month is about 17:35 pm.

Time passed, and soon it reached 17:20. In an instant, Chang'an City shrouded in twilight began to lit up.

The newly installed gas street lights on the streets everywhere are flashing with fire, and countless lights drive away the darkness and make Chang'an City dazzling.

On the side, the concubines who witnessed this wonder were surprised. Looking at the beautiful scenery comparable to the night view of the US dollar festival, they didn't know what words to use to describe it.

"Thousands of words are better than the four words 'Downlights'." Yuwen Wen said, looking at his family and looking at the lights in front of him, and he was filled with joy.

Yuchi Chifan looked at the dim lights and sighed: "In the past, I always heard people say that when the street lights on Huangzhou Xiyang are on at night, the street lights are so bright. Now the street lights in Chang'an City are on, and they look really spectacular."

"That's right, the lights illuminate the road, the night sky, and the eyes of people. The dark night is no longer scary." After Yuwen Wen finished speaking, he looked at the dim lights outside the imperial city, and then the bright lights in the palace, and was very satisfied.

The world's largest metropolis and the world's largest capital should have brilliant night scenes.

The dimly lit night Changan is like the North Star in the dark, pointing out the direction for all living beings to move forward.

The pointer of the pocket watch walked to 17:40, the sun had disappeared on the horizon, night fell, and Chang'an City was still full of vitality.

Yuwen Wen and his concubines picked up the thousand-mile mirrors and admired the spectacular night view. On the streets under the lights, pedestrians walked leisurely, with people riding horses passing by from time to time, and children chasing and fighting on the streets, without any curfew.

Starting today, Chang'an City no longer implements the traditional curfew system (the city gates will still be closed). When night falls, the gas street lights in the main streets will light up. Except for some areas (such as near the palace city and other places), all streets and yards allow people to move freely at night.

The gas street lights will be lit all night, and there will be patrol teams like patroling the streets, but people walking on the streets will no longer be strictly investigated unless the other party is suspicious.

Such treatment was only available on the Lantern Festival in the past, but from now on, it will become the norm.

In other words, Chang'an City will be a veritable city that never sleeps from tonight.

Yuwen Wen was talking to his family on the top of the city and ate some snacks. Before he knew it, the hour hand walked until exactly 18 o'clock, and bells rang everywhere in the city, and several young princes and princesses cheered:

"Time is up!!"

Time is up and the fireworks performance is about to begin. Yu Wenwen finished his snacks, clapped his hands, and looked up at the night sky.

Tonight is the first night of abolishing the curfew system. There are fireworks performances, and some department notified the whole city half a month in advance. In the past few days, residents of all walks of life have been reminded every day that there will be fireworks performances tonight.

Afterwards, Chang'an East and West City will also hold large-scale acrobatic performances, including the spread of ichthyosaurs to celebrate different nights.

Therefore, not only Yuwen Wen's family, but every household in the city should be men, women, young and old gathering together, waiting to watch the wonderful fireworks performance.

At the same time, the imperial guards on duty in the palace city also looked up at the night sky.

After a while, a ball of light roared into the sky, and then brilliant sparks burst out in the air, and countless bright lights flew into the sky one after another, making sparks bloom over Chang'an City.

The gorgeous fireworks bloom endlessly in the night sky, making the night in Chang'an City colorful. Cheers sounded everywhere in the city, slowly gathering into a tide.

There was a quiet palace city, and thin cheers sounded at the top of the city, which was the prince and princess cheering, and the imperial guards also cheered. Yuwen Wen did not care about the emperor's majesty and shouted.

Over the past thousands of years, countless dynasties have thought of many ways to "show off their wealth" in order to demonstrate their national strength, but no era can show different national strength to the world through technology as it is now.

Gas street lights have appeared a few years ago, but to be promoted for public lighting, technology is not a problem, but cost is the problem.

It takes money to lay gas pipelines and install gas street lights, and it also takes money to maintain gas pipelines and gas street lights. When a high-power gas generator is running, it is burning money.

Should this money be "burned"? The officials of the Political Affairs Hall have been arguing endlessly. Based on the principle of increasing revenue and reducing expenditure, everyone basically opposes the establishment of a "city that never sleeps" in Chang'an.

Because of this, the money "burned" every night will not be less, and the priests feel that there is no need to spend money in vain for some "face".

Yuwen Wen was good at following the flow and would not act alone, so the plan for public lighting of gas lamps was shelved.

Later, things turned around, that is, the successful improvement of the gas internal combustion engine and the improvement of the gas production efficiency of the gas generator, which greatly increased the demand for gas.

Although the improved gas internal combustion engine is not enough to become a reliable large-scale mechanical power, it can become an excellent power source for air compressors. The gas internal combustion engine is used to replace the steam engine to drive the air compressor, and the overall operating costs are similar.

However, the air compressor driven by the internal combustion engine saves time to use.

Therefore, after rigorous evaluation, everyone found that the scale of cold storage and various refrigeration equipment, which are now expanding, it is very cost-effective to use gas internal combustion engines to replace steam engines to drive the refrigeration system to operate. For this reason, it is necessary to build a gas system with unified gas supply.

Not only the cold storages, but also the wine shops, restaurants and various entertainment venues that have installed self-use cold storages, new air-conditioning, urgently need a unified gas supply system to support the technical transformation of their own refrigeration equipment.

In addition, the water pumps in the workshop driven by gas internal combustion engines, as well as the various lathes and small equipment in various workshops and workshops, can also operate at low cost once a public gas supply system is available.

The strong demand has led to the birth of the gas public gas supply system (charge). The greater the power of this huge system's gas generator, the more gas internal combustion engines are connected, the greater the profit. After deducting the operating costs, you can even make a profit and then make a profit.

Therefore, the public lighting system of gas lamps can be used on a sailboat, no longer a luxury for burning money.

Yuwen Wen's wish was realized many years later due to the development of productivity.

This is the social progress brought about by technological progress, which has caused the night sky of Chang'an City to be illuminated by gas street lights, rather than a luxury item that a certain king burns money for the sake of face.

Yuwen Wen looked at the fireworks blooming in the night sky, the dim lights in Chang'an City, and looked at the beauties on both sides, feeling quite moved, and wanted to write a poem.

The queen and the concubines listened attentively, but Yuwen Wen said: "This is a masterpiece I saw somewhere. Now I will borrow flowers to offer Buddha..."

He then chanted:

The north wind blooms at night, thousands of flowers and trees blow down, and the stars are like rain.

The BMW carving car is full of fragrance, the sound of the phoenix flute moves, the jade pot turns, and the fish and dragon dance overnight.

The moths and the willows are golden, and the smiles are filled with fragrance.

I searched for him for a long time, but when I looked back, the man was in the dim light.

After listening to the beauties, they were a little confused: Is this a poem? It is not a five-character poem, not a seven-character poem, nor a Yuefu poem.

But there is no doubt that this is a poem with extremely beautiful artistic conception. After listening to it, everyone couldn't stop savoring it. Looking at the "Thousands of Flowers" in the night sky, looking at the dim lights in front of them, and then looking at Yuwen Wen, the last sentence of the poem was echoed in his ears:
Chapter completed!