The most expensive room in the city that never sleeps has a strange name, called the "Presidential Suite".

What kind of thing is the president, the Ming people don't know, guessing that it may be the abbreviation of the chief military officer and the capital, right?

But the room that is full of spring in the harsh winter is too comfortable to live in, and the price of three hundred taels of silver for a night of doing nothing is also relatively clumsy.

Casually invite a few playmates to take a sauna bath also cost dozens of taels of silver, and then a full-body relaxation technician massage is one hundred and ten taels, hungry, never sleep, the eight major restaurants in the city are casually ordered, guaranteed to be sent to the guest's room as soon as possible, but the price is expensive......

In order to save some silver at a 20% discount, too many people are willing to pay a deposit of five hundred taels of silver in exchange for something called a membership card, of course, five hundred taels of silver is a deposit and can be refunded.

In more than a month, Zheng Xiu'e and Chu Chu were dumbfounded, the 600,000 taels of silver that had been spent on the total investment were basically back now, although they didn't earn so much silver, which made them unacceptable.

"Why does my husband's brain grow?" After settling the accounts, Zheng Xiu'e asked Chu Chu happily: "At that time, he said that he would receive the blonde membership card, and I thought it was whimsical, five hundred taels of silver, enough to buy seven or eight small courtyards in the outer city."

Who knew that more than 1,000 tickets had been sent out in just over a month, no, the investment in our city that never sleeps has almost returned to its original cost. ”

Chu Chu looked at the thousands of lights outside the window, and only felt that the night view of the city that never sleeps was beautiful, she pulled Zheng Xiu'e and pointed to the crowd on the street and said:

"Sister, I just know that no matter what business you do, popularity is the most important thing. We have spent a lot of oil to light up the city that never sleeps, and there are more than 10,000 people who come to play here every night, and at the most more than 50,000 or 60,000. We have a lot of novelties here, and it makes sense to make a lot of money. ”

A kind of big killing weapon used by the Ming army to defend the city is called the fierce fire oil tank, which is to use manpower to pressurize the oil tank to make the oil tank have a certain pressure, which is similar to the fire hose, so that the fierce fire oil can be sprayed out.

The besieging enemy army and the approaching shield carts and rushing carts were doused with fierce fire oil and then attacked by torches, which suddenly ignited a raging fire, with a little shadow of the flamethrowers of later generations.

Fierce fire oil is not vegetable oil, but petroleum products, as early as the Song Dynasty Han people began to use oil, this era has been known to make easy to ignite through simple boiling.

The term oil was written by the Song Dynasty scientist Shen Kuo in his book "Mengxi Bi Tan", when the Song people discovered oil and knew that it was easy to burn.

Huang Han had studied the fierce fire oil, and also knew that some crude oil oil could be obtained close to the diesel and kerosene of later generations through natural precipitation, and the fierce fire oil used by the Ming army was similar to diesel and kerosene.

Then take the method of atmospheric distillation to remove the impurities, and you will get relatively pure kerosene, which can be used to light the lamp.

This primary processing technique is not worth mentioning, and it is similar to distilling liquor, and it is possible for craftsmen to obtain large quantities of kerosene of similar quality to later generations by mastering the relationship between temperature and oil quality.

Of course, the fierce fire oil lamp is not a vegetable oil lamp like the rush grass used by the Ming Dynasty, but an oil lamp with a glass base and a glass lampshade with a special cotton wick.

The technology of this thing is not worth mentioning, the key is to have the right lamp oil, but in order to earn the silver of the dignitaries, such an oil lamp is very exquisite, and the use of gold and silver for the lamp head is much longer than the use of iron sheets.

The street lamp in the city that never sleeps is such an oil lamp, but the lamp head is not gold and silver but copper, and the brightness and cost performance are too different from lighting a candle.

Grand theaters and places all use fierce fire oil lamps, and in order to avoid some people can't stand the smell of burning fierce fire oil, and in order to prevent fires, the oil lamps are on the wall, isolated by glass covers, and outside the walls, there are special servants and female workers who are responsible for lighting to change the lamp oil and keep the lampshades clean.

The cost of running the city that never sleeps is high, and there are many workers employed, with two or three hundred people in charge of the lights in two shifts alone, ninety percent of whom are women.

Because it is more difficult for women to find employment than men, the principle of giving priority to women is applied to work that does not require heavy physical strength in the city that never sleeps, of course, after giving priority to military dependents.

For this reason, the main building of the city that never sleeps is designed with a sandwich wall between the rooms that allow one person to pass, and in the sandwich wall there is a honeycomb coal stove used to heat nickel and white copper radiators, light holes, water pipes, drainage pipes, and exhaust holes leading to the outside.

In this era, it is not feasible to use heating pipes for heating, and the city that never sleeps adopts the simplest and most effective benzene method, directly in the outer wall of the room, boiling water with a honeycomb coal stove, keeping half of the hot water stored indoors, similar to a radiator, and it is enough to store hot water above eighty or ninety degrees.

This radiator is actually exposed in the indoor part of the concave and convex surface to increase the heat dissipation effect, the outside is like a square hollow copper container, the hollow position is actually a honeycomb coal stove.

However, unlike other honeycomb coal furnaces, which are filled with yellow mud to increase the thermal insulation effect, it is surrounded by a part of a water-filled copper container, which makes better use of the heat energy of honeycomb coal combustion.

Due to the need for people to take care of the independent honeycomb coal furnace heating facilities, and the need for people to replenish water and replace briquettes, the need for manpower to warm a city that never sleeps of such a scale can be seen.

The design of the sandwich wall is to keep the business area clean and tidy, and the guests on the working surface can not see it at all, and the dignitaries only see the warm and bright environment of the cold winter and can take a hot shower at any time, and they cannot see the busy staff in the sandwich wall.

It is also because of the sandwich wall that if the flag guard wants to monitor and listen to a certain Jin merchant or an official who comes to consume, these people are simply unable to prevent it.

In the eyes of modern people, working in the sandwich wall is simply dark, boring and hard, but Da Ming Shengdou Xiaomin does not think so.

They feel extremely happy to be able to get such a job, because the working environment is so good, they don't have to endure the wind, frost, snow and rain, and the work is easy and comfortable.

For a month, the city is popular all over Beijing, and if the banquet between the bureaucrats is not arranged to go to the sauna after drinking on the street outside Chongwenmen, it will be regarded as a small family.

The merchants dared not speak out in anger, because with the city that never sleeps, the cost of their entertainment has increased several times for no reason, and it is a heavy burden to pay a deposit of five hundred taels of silver and receive a membership card to give to the adults.

Merchants know that giving out the membership card is equivalent to beating a dog with a meat bun, and five hundred taels of silver cannot belong to them at all.

This has been the case since ancient times, and officials basically do not need to spend their own money on high-end things that officials enjoy, and naturally there are people who are in a hurry to pay filial piety.