Now the Rotating Instrument Clock is primarily powered by a motor, with its speed controlled by an astronomical clock or radio oscillator.

However, the early Rotating Instrument Clocks drew their power from chain-driven weights or springs, with their rotational speeds controlled by centrifugal governors.

The Water Transporting Celestial Observation Platform, representing the pinnacle of Old Su's life, utilized this latter principle.

Previously, when designing the layout of the telescope, Xu Yun made some modifications to the Rotating Instrument Clock based on the Water Transporting Celestial Observation Platform.

First, he adjusted the torque and also created a spiral passage inside the cylinder body.

Turning it into an attached device.

Subsequently, Xu Yun bent down and reached into the cylinder with his right hand to begin feeling around.

A few seconds later.

About 30 centimeters along the cylinder wall, he felt three small protruding discs.

Xu Yun gave a slight twist, and an iron disc was removed.

Then he casually picked up a piece of foxtail grass from the ground and inserted it into a gap.

At the same time, he adjusted the torque, precisely enlarging it to twenty times speed based on the scale.

Soon.

Driven by the internal spring, the foxtail grass began to rotate with the platform.

"One... two... three..."

Xu Yun watched seriously for a few minutes, silently keeping count.

A few minutes later.

A slight smile of satisfaction appeared on his face.

The precision of this rotating instrument equipment was very perfect, which was more than sufficient to undertake this observation task.

In this way.....

As long as the donkey at home turns a few more discs, it will be fine.

He then reassembled the iron disc and began to inspect the remaining Star-finding Mirror and guide mirror.

Those familiar with astronomical telescopes should know.

Due to the generally small field of view of the primary mirror of an astronomical telescope, it is often very difficult to directly find the observation target in the primary mirror—because near the target, there are often no other celestial bodies available for reference comparison.

In later times, to solve this problem and quickly locate the celestial body to be observed.

Astronomers attached a small telescope with low magnification and a wide field of view next to the primary mirror.

This is the Star-finding Mirror.

The Star-finding Mirror typically uses a refracting telescope, with its optical axis parallel to the primary mirror's optical axis.

The aperture is generally around 50 to 100mm, the field of view is about 30° to 50°, and the magnification is 7 to 20 times.

A graticule is mounted on its focal plane for calibration, which can be modified with a ruler.

During observation.

One only needs to first find the celestial body to be observed with the Star-finding Mirror and align the body to the center of the Star-finding Mirror's field of view.

Due to the parallel optical axes, the celestial body will also appear synchronously in the primary mirror's field of view.

Additionally.

When the primary mirror is engaged in long-term observation.

To promptly correct tracking errors, observers also set up a telescope for monitoring purposes next to the primary mirror.

This is the guide mirror.

The diameter, focal length, and magnification of the guide mirror must all be greater than those of the Star-finding Mirror, and the field of view smaller.

When the observation target deviates from the primary mirror's center, this situation can be reflected in the guide mirror, allowing it to be promptly adjusted back to the field of view center.

However, there are many unscrupulous merchants in later times. Some popular telescopes have only one of either the Star-finding Mirror or guide mirror, severely impacting novice observation experiences.

The perspective returns to reality.

Only to see Xu Yun come to the head of the Star-finding Mirror and measure the optical axes of the two mirror surfaces using a portable wisdom tooth gauge.

"17.4 centimeters."

Then he reached the tail and continued with the measurements.

"Also 17.4 centimeters."

Then there was the guide mirror.

"Head 12.1 centimeters."

"Tail also 12.1 centimeters."

"Completely consistent, parallel."

After completing the examination.

Xu Yun stood up, dusted off his hands, and gave Siegfried a thumbs-up:

"Master Qi, the cylinder is fine, but how is the mirror surface now?"

Seeing that the cylinder passed Xu Yun's inspection, Siegfried's shoulders slightly relaxed, and he replied:

"The mirror surface is still being polished, after all, unlike the cylinder, the mirror surface is completed by us alone.

So it will be slower. At the present pace, another week will probably be needed....."

Xu Yun remained silent for a moment, then calculated the approximate time and said:

"Master Qi, do not worry, do not overlook quality for the sake of time.

If a week is not enough, then ten days; if ten days are not enough, then two weeks; if two weeks are not enough, then a month.

The master has no strict deadline for the project; everything is based on precision, slow work yields fine craftsmanship."

Then he remembered something and glanced at Xiaoli, who was staring at him, and asked:

"By the way, Master Qi, what about Miss Li's microscope..."

Upon hearing this, Siegfried immediately pointed to a certain room nearby:

"The microscope is finished, it's in that workshop, you can enter by pushing the door."

Xu Yun looked at him again to confirm:

"Master Qi, the microscope was made according to the blueprint I gave you before, right?"

Siegfried nodded emphatically:

"That's right, exactly as instructed by Mr. Wang, with no deviations whatsoever."

Xu Yun nodded, pondered for a moment, and said to Siegfried and Xiaoli:

"Master Qi, Miss Li, I'll go inside for a check."

Xu Yun, being the person most knowledgeable about the microscope, had a perfectly reasonable request.

Even Xiaoli said nothing more and watched as Xu Yun entered the house.

A quarter of an hour passed.

Crunch——

The door of the house was opened again.

Xu Yun emerged, carrying a box.

He raised the box toward Xiaoli and smiled:

"Miss Li, the precision of the microscope is correct, but the box might be a little heavy.

I'll carry it for you, and later hand it over to the coachman. You can check it yourself when you get home, alright?"

A flash of excitement crossed Xiaoli's eyes, and she quickly nodded:

"That's great, thank you very much."

Seeing that, Xu Yun placed the box down and cupped his hands to Siegfried:

"Master Qi, there are still matters at the house; since all is well, I shall take my leave. Please pay more attention to the remaining lenses."

Siegfried hurriedly returned the gesture:

"Mr. Wang, rest assured, this matter is remembered by this old man. There shall be no mistakes."

Afterwards, he accompanied Xu Yun and Xiaoli back along the original route, escorting them to the entrance.

Xu Yun handed the box to Xiaoli's carriage driver and parted ways with Xiaoli on the spot.

Click-click-click——

Watching the carriage gradually fade into the distance, Xu Yun sighed slightly:

"Sorry, Old Li..."

.........

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