After Li Wenyuan stretched out his hand to catch the falling pigeon, he took it to his face, and then stroked the pigeon carefully, while cooing and teasing the pigeon, Li Wenyuan's other hand quietly touched the thing tied to the pigeon's leg, it was indeed an object wrapped in cloth, in terms of size and shape, it seemed to be a letter, Li Wenyuan knew what was going on, I said in my heart: I said why this pigeon is wandering here repeatedly, it turns out that it is for this reason, if this pigeon did not come back today, I would have really forgotten him.

Thinking of this, Li Wenyuan waved his hand to disperse the people, and then returned to the room, closed the door, locked the doors and windows, and then took off the cloth bag on the pigeon's leg, and then put the pigeon in the empty bird cage next to him, and after filling it with water and food, he let the pigeon stay in it to rest and have fun, Li Wenyuan lit the candle on the table, and then carefully opened the cloth bag, and then fell out of a note from it, Li Wenyuan slowly unfolded the note, With the help of the candlelight next to him, he looked at the words on it: Xue Ju united with Li Yuan to fight against the Western Regions.

After Li Wenyuan read it, he burned the note into ashes with the help of the candle flame, and then took out several folders in the room, and then Li Wenyuan sat on the table calmly, picked up a folder and flipped through it repeatedly in his hand, and finally found what he wanted most. Li Wenyuan searched carefully on it, and then stopped looking at a person's life on the document, and then Li Wenyuan found the relevant information of this person in the file in another folder, and then suddenly realized: It turned out to be him, I said how could I use this method, but this kid is also very powerful, it has only been a few years, and he has climbed to this point, I can't think of it.

But the arrival of this message brought not only the dusty memories that were awakened, but also the news that Li Wenyuan least wanted to get: Xue Ju finally chose to form an alliance with Li Yuan and fight to the end with himself. Thinking of this, Li Wenyuan couldn't help but clench his fist tightly hidden in the sleeve of his robe, then took a deep breath, and then pushed the door out of his spirits, and came to a large logistics and warehousing center in Wuwei County that was set up after turning his face with Xue Ju.

This storage center was specially used to stock up on all kinds of military supplies needed for this war against Xue Ju. For this reason, the rails of the steam locomotive were extended to the storage center, and on both sides of the tracks were built platforms that were at the same level as the threshold of the steam locomotive, and after the steam locomotive stopped here, the laborers could step on the ground and carry materials downward, eliminating the waste of energy and time of jumping up and down. Moreover, after testing the durability of the steam locomotive, and it only took a day and night to travel from Dunhuang County to Wuwei County, Li Wenyuan began to try to transport some local products from Wuwei County to Dunhuang County.

At present, the ice books are used to build cisterns near the springs that are carefully selected by icemakers in the cold winter, and hundreds of them have been repaired. In the winter, when the water in these pools was frozen, the icesmiths began to work, carefully digging out pieces of ice from the reservoirs filled with spring ice, and then transporting them by vehicle to a huge ice cellar in the county town of Wuwei County for storage. The ice cellar is more than two meters deep underground, and a large number of straw and reed mats are laid on the outside as insulation, and then a large number of bluestone are used to lay the ground and the surrounding walls, and then all the gaps are wiped with secret materials, and then the spring ice that has been created is put on top, and then covered with rice bran, leaves and other insulating materials to cap the top, and finally the cellar mouth is sealed with materials, so far it is considered to be finished in the cellar, and after storage, it is waiting for the next year to enjoy.

But one of the biggest drawbacks of this is that the ice cubes will actually still melt in the cellar, but the speed is very slow, according to this ancient method of storage of the ice cellar after a summer almost because of melting and consume almost two-thirds, only one-third can be used normally, which means that almost every winter has to pay twice as much labor in vain to ensure the daily consumption of the whole summer, which is an unbearable waste for Li Wenyuan, who is used to careful budgeting. After all, when people eat horses and chew horses, they are all white flowers.

Later, far away in the arsenal of Dunhuang County in the gunpowder production line, a worker inadvertently knocked over a bowl of saltpeter powder into a bucket next to it, the saltpeter powder into the water on the spot dissolved clean, the worker was in a hurry to reach directly into the bucket to catch the bowl containing saltpeter powder, the dog days in the workshop interview was stuffy, but the worker reached into the bucket in the water was cold and biting, so that the worker in the thirty-nine days can not help but sweat hair stand on end shivering. Later, it reached Li Wenyuan's ears at this time, and Li Wenyuan remembered that the main ingredient of this saltpeter powder is calcium nitrate, when this kind of thing is dissolved in water, it will absorb a lot of heat from the water and the surrounding environment, which will lead to a sharp drop in the surrounding temperature.

Moreover, this aqueous solution of dissolved calcium nitrate can also be further concentrated by evaporation, and then cooled by the concentrated solution in the low-temperature environment of using calcium nitrate to make ice, and the calcium nitrate is extracted from the concentrated solution in the form of crystallization again. Calcium nitrate is not a precious thing for Li Wenyuan, not to mention that it can be recycled to reduce costs, so under Li Wenyuan's promotion, summer ice is no longer the privilege of some dignitaries.

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