After dinner, Zhang Yang drew the structure of the fireworks, and remembered that after the heat gathered at the bottom of the fireworks, there would be a violent tension in the launch tube to propel the fireworks.

To increase the height of the fireworks, it is necessary to make the fireworks produce a large initial velocity when the primer is detonated, and this initial velocity is used to increase the height of the final launch of the fireworks.

The initial velocity determines the launch height.

The structure of the fireworks is drawn.

Take a gasp.

It's not that easy.

Zhang Yang drew the drawings melancholy, and there were many technical problems.

The flame of the oil lamp swayed with the wind blowing in through the crack in the door, and Li Yue's shadow stretched long.

Zhang Yang saw her come out of the room holding something.

Looking back again, she walked into the room with the futon in her arms.

Why would she take my futon to her own room?

Zhang Yang looked back and looked at it again, huh? Really.

Li Yue poked his head out of his room and said, "Come and sleep in my room at night." ”

"Oh." Zhang Yang nodded.

Then I saw Li Yue walking into the room with a pile of firewood, as if he was going to light a warm kang, "It's too cold, put the two of us on top of each other, and add a warm kang to the two layers of bedding, which will be warmer." ”

Zhang Yang looked out the window, and there was a howling northwest wind outside.

It's a wicked cold.

After washing, the two lay on the bed.

Zhang Yang smelled the smell of her room and continued to ponder the drawings in his hand.

The kang was burning very warm, Li Yue lay aside and said, "Do you say that there is really such a thing as fake death in this world?" It's the kind of thing that can't wake up when you look at it all the time. ”

Zhang Yang looked up at the roof, thought for a while, and said; "You mean vegetative people?"

"Vegetative?"

"Pretty much that." Zhang Yang put the drawings aside and lay down completely.

"Can you wake up then?"

Li Yue wrapped himself in the quilt and whispered.

"I remembered an incident, there used to be a vegetative person who couldn't wake up, he used to quarrel with his wife before he got sick, and now when he can't sleep, his wife scolds him every day by the bedside, turning over the old accounts and scolding, and then he is angry and wakes up, and then the couple lives happily ever after."

Li Yue whispered: "Did his wife still scold after that?" ”

Zhang Yang thought for a while, "It should still be scolded......"

Li Yue said: "They must be very happy. ”

"Hmm."

Li Yue pursed her lips and smiled, "Sleep." ”

"Well, sleep."

In December of the fourth year of Zhenguan, the cold air from the north swept down, and countless livestock froze to death in the steppe of the Turkic people.

Chang'an City was also so cold that people shivered.

Zhang Yang took a deep breath of cold air, then took a long breath and turned into a cloud of fog in the cold air.

Rubbing your hands together may make your hands warmer.

The spinach in the yard was also frozen a lot.

I don't know how many days these spinach can be eaten.

Break some of the ice cubes in the water tank and remove some ice and water and put them in the jug.

Then light the stove and boil the water first.

Li Yue got up sleepily and saw Zhang Yang busy in the yard.

After getting dressed, Li Yue walked out of the room and the cold air greeted him, and he shivered unconsciously.

Zhang Yang said: "Today will be a sunny day, you can take out your clothes and bedding to wash." ”

Li Yue looked at the sky, "How do you know?" ”

Zhang Yang pointed to the Chaoyang in the east and said: "The clouds are transparent fish scales, and the cold air passes through and there is no rain, which means that the high altitude is also very dry." ”

Li Yue nodded as he listened.

Zhang Yang swept the yard and continued: "The cold air in the north has passed, and there is no rain, today will be a sunny day, some rumors say that the fish scale cloud is an earthquake cloud, from a meteorological point of view, there is no such statement at all." ”

"Meteorology?" Li Yue discovered a new word.

She helped sweep and said, "What is meteorology?" Is it one of the hundred schools of thought? ”

Zhang Yang cleared his throat and said, "Sort of." ”

"My husband is so powerful, I know everything, I have to become so powerful." Li Yue clenched his small fists to cheer himself up.

Chop wood to make a fire, make two pancakes, and fry the mutton, which can be eaten with rolls.

After breakfast, Zhang Yang continued to load the artillery battle.

Li Yue took his small notebook and said: "I understand a little, I don't feel very cold when it snows, and it is the coldest after the snow stops, because the snow condenses and does not absorb heat, and the snow melts before it absorbs heat, and it seems that when the sky is clear, it is even colder when the snow melts." ”

That's a good way to understand.

Li Yue recorded it in his small notebook.

Zhang Yang raised his eyes to see what was recorded in her small notebook.

Li Yue flashed over and covered the small notebook, "You can't read it." ”

Zhang Yang said curiously: "What is written?" I can't even look at it. ”

Li Yue hugged the small book and said, "Anyway, you can't read it now, ...... later." I'll show you when the time comes. ”

"Okay."

Zhang Yang withdrew his eyes at this time.

Don't try to make the little daughter-in-law give up her attachment, and I don't know where the attachment in this little girl's heart came from.

At noon, the sun warms up.

Zhang Yang took Li Yue to walk outside Chang'an City, Li Yue sat in the carriage and looked at the scenery along the way, and there were some ice slags by the river.

It seems that the river has not completely melted because of the ice.

Zhang Yang sat in the carriage and let the horse walk slowly.

The breeze was blowing, and Li Yue felt the warmth of the sun while soaking the sun.

There were still artillery battles on the carriage, and Zhang Yang was going to take them out for experiments.

Stopped in an open area, and there was no one else around.

Li Yue's gaze saw Zhang Yang put a cannon on the ground, and then lit the fuse.

Then quickly ran back.

The fuse burned into the shell, and white smoke rose from the shell.

Zhang Yang ran back and covered Li Yue's ears.

Li Yue looked up at Zhang Yang playfully.

"Bang, bang!"

There were two explosions before and after, and the cannon didn't fly out of the bamboo barrel at all, how did it become a double cannon?

Li Yue opened her mouth and said excitedly: "It's so powerful, it can ring twice." ”

The first primer detonates, and the second is the cannonball.

Listening to Li Yue's surprised voice, Zhang Yang thought far away in his heart, it didn't fly at all.

The second time, Zhang Yang made some changes, leaving some more space between the bottom fire and the artillery battle.

Ignite the lead ......

"Bang ......"

There was only one explosion.

The internal artillery battles were not detonated at all.

Li Yue said with some excitement: "I want to play too, I want to play too." ”

Zhang Yang took out a small cannon and handed it to her, "Na, play with this." ”

Li Yue looked at the small artillery battle in his hand, and then looked at the big cannon battle on Zhang Yang's side, "I want to play big!" ”

"The big one is too dangerous for you."

"If you can play, I will play too." Li Yue protested.

"When my experiment is successful, I'll play big for you."