met free Page 1993
Page 1993
Now, the new Ming Dynasty has merged the Imperial Observatory and the Astronomical Institute.
And two-thirds of the mediocre staff were dismissed.
The new institution will be called the "Astronomical Institute".
Zhao Yuan left the city wall,
I plan to visit the Astronomical Institute.
Li Shishi wasn't interested in that thing.
Liu Huiniang, however, was in high spirits.
She has many relatives who are interested in technology.
Not only did our ancestors improve the wet copper smelting process,
Her cousin invented the tangram puzzle a few years ago.
The King of Liang personally arrived,
Chaos erupted throughout the Astronomical Institute.
Upon hearing the news, the academy's envoy, Huang Shang, rushed to greet him.
There was a hint of resentment beneath the enthusiasm.
This former top scholar of the previous dynasty,
He was first sent by Emperor Huizong of Song to compile Taoist scriptures.
Now Zhao Yuan has put him in charge of astronomy.
But he had always wanted to be a political appointee.
"How's the pendulum clock coming along?" Zhao Yuan asked casually.
Huang Shang said, "It's almost done."
Zhao Yuan nodded: "Go and take a look."
The Northern Song Dynasty's water-powered astronomical clock tower and the discussion on the manufacture of the celestial sphere.
It is still displayed in the office of the Astronomical Institute.
These two items belong to astronomical measurement devices.
The clock attribute is actually secondary.
After Zhao Yuan took control of Tokyo,
The astronomical institutions were quickly merged and streamlined.
He also tasked Huang Shang with leading a team to develop a mechanical clock.
The chief engineer of the R&D team,
It was Wang Daoshi who came up with the idea of "discussing the manufacture of the Jiheng Institute".
The scholars from Yangzhou brought by Zhao Yuan
There are a few who like to study physics.
He also joined this scientific team.
Some craftsmen were also borrowed from the Ministry of Works.
The entire team consists of approximately thirty people.
The overall idea was provided by Zhao Yuan.
No spring mechanism is needed.
Powered by a heavy hammer
Use a pendulum to keep time.
After Galileo invented this type of pendulum clock
Besides being too big,
Besides being inconvenient to move,
There are no major drawbacks.
Even in the internet age,
There are also many people who are into "retro" styles.
This type of clock is used to keep track of time in the home.
He then filmed a video and posted it online to show off.
But Zhao Yuan only saw the appearance.
Knowing the basic working principle,
I have absolutely no idea about its specific internal structure.
Wang the Taoist priest was squatting inside the house, conducting research.
Upon learning that Zhao Yuan had arrived,
He hurriedly led his team to greet them.
"Greetings to King Liang, greetings to Queen Liang!"
Zhao Yuan responded with a friendly smile.
Compared to facing other officials,
The smile at this moment is the most sincere.
"No need for formalities, how's the research going?"
The Taoist priest said, "It's mostly finished."
"Some minor changes are still needed."
Although the Song Dynasty's water-powered astronomical clock tower
And Galileo's hammer pendulum clock,
They all require the use of an escapement for adjustment.
But the escapements of both of them,
They differ greatly in design.
Wang the Taoist priest essentially wants to redesign it.
There is more than one hammer clock.
Each one is more than a person tall.
Wang the Taoist priest had his assistant completely disassemble the outer casing.
The Taoist priest pointed to one of the machines and explained in detail.
"The heavy hammer drives the ratchet,"
"The gear teeth push away the pawl of the pivot (axle),"
"This causes the pivot to rotate by one angle."
"The thorn beneath the pivot,"
"It just so happens to turn around and block the lower gear teeth."
"The ratchet continued to turn, pushing it away again,"
"The pivot then returned to its original position,"
"Thus, one swing is completed..."
Chapter 1752 The Pendulum
Explanation plus demonstration,
Zhao Yuan understood immediately.
The Taoist priest continued, "This horizontally swinging device above is called Tianquan."
"It was originally used to adjust the speed."
"I am truly ashamed,"
"The single pendulum method mentioned by King Liang was not used,"
"As a result, this lateral oscillation can also be adjusted,"
"Daily calculations using a water clock and sundial resulted in extremely large errors."
Zhao Yuan smiled.
There was no criticism.
The isochronism of a simple pendulum
This thing is simple to explain.
The detailed explanation is extremely complex.
It's normal for Wang Daoshi not to follow Zhao Yuan's instructions.
Furthermore, based on the heavy hammer strategy provided by Zhao Yuan...
Wang the Taoist priest was able to develop a pendulum clock.
That's already considered very capable.
The Taoist priest then pointed to the pendulum clock next to him.
"Later, I made several large pendulums,"
"I watched the drip test for three days."
"The period of the pendulum is indeed unrelated to the amplitude of the pendulum,"
"It only depends on the length of the cycloid."
"The specific balance device that adjusts the speed,"
"How many 'gates' (points in the escapement that prevent the swing rope from moving) should be set for optimal timekeeping?"
"We are still slowly and repeatedly comparing them."
"Use a sundial to test,"
"How big is the current error?" Zhao Yuan asked.
The Taoist priest replied, "An error of one month."
"About 15 minutes."
Zhao Yuan nodded approvingly: "It is already extremely accurate."
The Taoist priest said, "It can be improved further."
Ancient sundials in prefectures and counties
The production quality is not very good.
An error of up to fifteen minutes can occur in a single day.
However, the central government's astronomical department,
The sundial it used was extremely accurate.
The daily error is no more than 20 seconds.
The concept of "hour" already existed in the Song Dynasty.
Zhao Yuan said, "We will follow the old practice when we are young."
"Could we extend it by another hour?"