Jiang Si had been learning to paint from her master since she was a child, so she recognized at a glance that the handwriting on the envelope was from her master.
She also knew that her master wrote with his left hand.
However, regarding the fact that her master suddenly wrote her a letter and sent her things...
Jiang Si was quite surprised.
Although his wife didn't explicitly say where her master had gone, Jiang Si could roughly guess from her words.
My master was probably seconded to a classified unit.
This can also be seen from the fact that the mailing address is an encrypted mailbox.
Thinking this, Jiang Si quickly opened the envelope and began reading it at a glance.
"What did the letter say?" Huo Tingzhou saw her solemn expression and a bad feeling suddenly rose in his heart.
Thinking back to the assassination attempt on Mrs. Fang by secret agents, he couldn't help but frown.
"Is Professor Yu alright?"
"It's okay, it's not what you think."
Jiang Si took a deep breath and tried to keep her voice steady, "See for yourself."
Huo Tingzhou took the letter and quickly glanced through it.
The letter was very brief.
There were no pleasantries, no explanations.
The label reads: "The parts inside the package must be drawn with the highest precision, including three views (front, top, and side views), a plan view, and detailed sectional views of key components."
[Dimension lines need to be marked during the drawing process, but specific values are not required. Scale: 1:1.]
[Once completed, seal and mail back to this mailbox.]
If they hadn't both been so familiar with Professor Yu's ways, they might have thought someone was playing a prank.
While Huo Tingzhou was reading the letter, Jiang Si had already opened the package her master had sent.
One of the bags contained drawing tools.
Jiang Si glanced at them briefly; these items must all be custom-made and not available on the market.
In addition, there is a metal part wrapped in thick velvet.
It's about the size of a palm, with a somewhat complex shape, covered with fine grooves and interfaces.
"This should be a component from inside the rocket engine."
Huo Tingzhou had some knowledge of this subject, and he took it and looked at it carefully for a while.
"This is for connecting to a centrifugal pump, but it's an outdated model from overseas."
"Outdated?"
Jiang Si was surprised, but she felt that things were not so simple.
Completing such a detailed drawing would take at least a month.
Her master wouldn't just send her a discarded part for no reason.
Could it be that Master is deliberately testing her level?
Huo Tingzhou thought the same thing. After pondering for a moment, he suddenly had a bold guess.
"This time they sent an obsolete model; maybe next time it won't be..."
Jiang Si: "You mean it's under development?"
“That’s right.” Huo Tingzhou nodded.
If he's not mistaken, the development of the rocket engine may be nearing completion.
To prevent leaks during the production of these delicate parts, all drawings had to be hand-drawn.
They will then be manufactured by different military factories.
Finally, these components will be transported to the Beijing Aerospace Base for unified assembly.
What Jiang Si had to do was to draw complex three-dimensional mechanical structures into two-dimensional drawings with an error margin as low as millimeters.
Otherwise, during the rocket launch process, even the slightest flaw could lead to launch failure.
After listening to Huo Tingzhou's analysis, Jiang Si remained silent for a moment.
She paced back and forth in the living room several times before finally asking.
"Doesn't something seem off?"
Huo Tingzhou, afraid of interrupting her thoughts, didn't speak, but gestured for her to continue.
Jiang Si said, "Master went missing in 1963, which means he has been working in the field of secrecy for more than six years."
"If what you say is true, then the engine development project is nearing completion."
“Then Master can simply draw it himself.”
Why did he choose to have me paint this, going to such lengths instead of the more convenient option?
As they were talking, Jiang Si suddenly turned her head and looked over.
"Do you remember when your master taught me to draw these kinds of mechanical diagrams?"
Huo Tingzhou nodded. "I remember, you were eleven years old that year."
That year was also the year he left the Jiang family.
Jiang Si listened thoughtfully; of course she knew which year her master had taught her.
However, at the time, she couldn't understand it at all.
She remembered asking her master why the style of her art had suddenly changed at the beginning of this semester, and why she was being asked to draw such boring and tasteless things.
My master didn't explain much at the time, only saying that having more skills is never a bad thing, and that I would understand later.
Now that all these things are connected, Jiang Si finds it terrifying to think about.
Could it be that Master had already received a secret mission back then?
Thinking about it more deeply, is there another possibility?
From the moment his master went to the Jiang family to teach him to paint, he was already prepared to cultivate himself in this direction.
"There's one more thing—"
Jiang Si paused, her gaze falling on the envelope from before.
She picked it up and glanced at it, then looked at the letter her master had written for her.
"I don't understand why my master used his left hand to write me letters?"
As she said this, Jiang Si felt a vague unease.
"Do you think something might have happened to Master?" she asked.
Huo Tingzhou had the same suspicion, but there was no way to verify these questions at the moment, so he could only offer gentle reassurance.
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