Little known.

In ancient Huaxia, the purification of salt had always been a troublesome affair.

In the most primitive tribal eras, humans initially relied on eating raw flesh and blood to obtain salt.

After entering the era of civilization,

the ancestors found salt wells and thus gained methods for processing crude salt.

By the Tang and Song periods, fine salt refined from sea salt gradually appeared and was quite expensive.

The highest price even reached a pound... or rather sixteen taels and ninety wen.

But the term 'fine salt' here is actually a concept compared to earlier crude salt.

Compared to the standard table salt of later generations, the fine salt of this period still contained many impurities.

Such as sulfate ions, magnesium ions, calcium ions, etc...

Especially magnesium ions.

This stuff, when entering the human body, could cause diarrhea, heart function disorders, and other anomalies.

For Wang Yue at this time, it was practically a deadly substance, and injecting it was essentially murder.

Earlier, to preserve Wang Yue's life, Xu Yun could only temporarily cope with fine salt.

After all, efficiency comes first.

Moreover, the purpose of adding table salt was merely to dehydrate ethanol and increase the alcohol concentration, leaving minimal residues in the human body.

But now, with physiological saline injections, it can be foreseen that this will be an extremely long-term treatment.

Thus, these impurities become somewhat troublesome.

Therefore, purifying sodium chloride has become a necessary and urgent step.

Indeed.

There are many methods to purify sodium chloride.

For instance, using seashells, coconut shells, or any acidic fruit can do the trick.

But don't forget.

Xu Yun came to this era with a task to complete.

The stronger the ability he showcased now, the easier it would be to gain Old Su's trust.

Coupled with the factors of the era, he also needed a certain status to do some things — whether he succeeds in the end is one thing, having a say is another.

So, after careful consideration, he decided to hand-build a generator and use electrolysis to prepare sodium chloride.

Having made up his mind.

Xu Yun pondered for a moment, then said to Old Su:

"Sir, intravenous injections require something called physiological saline, which needs to be made by another method.

Therefore, may I trouble you, sir, to prepare some materials for this humble one?"

"What do you need?"

"...These things might be a bit expensive."

Upon hearing this, Old Su grandly flicked his sleeve:

"Zheng Ru's life is at stake, and my family is wealthy; just say what you need."

Only then did Xu Yun nod and flip to the other side of the paper with the strange symbols.

He began to write down the needed materials:

"A piece of natural magnet, best shaped like this...

Then process the fine copper into thin wires, the longer the better... along with two copper blocks and several copper plates...

Also need a half-meter iron shaft, wooden molds, tung oil, a turntable, graphite, Poisonous Heavy Stone, and the water supply equipment in the mansion...

Send someone to the Sour Plum Shop on the east side of the city to ask the owner if they have any white stuff that can produce ice; if so, buy some back...

Oh, and prepare the donkey used for grinding."

After describing the requirements, Xu Yun handed the paper to Old Su.

This time, he was preparing to make a standard disc generator, the principle being Faraday's electromagnetic induction phenomenon.

Or simply put, generating electricity through magnetism.

The iron shaft forms the rotor core, copper wires soaked in tung oil are wound around it as windings, and the magnet acts as the stator.

An operation that can be done by hand.

What?

Are you asking about the voltage issue?

U=kB∠nV, voltage equals the coefficient times the magnetic strength times the effective length of the rotor times the number of coil turns times the difference in rotational speed, which can all be pre-calculated.

Meanwhile, the precision of the copper wire only needs to be five millimeters, which even the industrial standards of ancient times could easily meet.

Throughout the entire process, the biggest problem isn't technology or craftsmanship, but the cost of production.

According to Xu Yun's design.

The generator's base cost would be over 200 guan of copper coins, equivalent to two hundred taels of silver, with potential increases at any time.

Converting this based on the previously mentioned concept is roughly equivalent to 200,000 in later eras.

And these generators, without voltage regulators and distribution devices, could do very little in ancient times.

To put it bluntly, this thing is practically burning money.

So if you time-travel to an ordinary family, you'd probably get a beating from your parents before you even fiddle with the generator...

However, at this point, to treat Wang Yue, Old Su obviously would not be too concerned.

After getting Xu Yun's blueprint, he immediately summoned Mr. Xie, the Old Chief Steward.

He had this head steward work overtime at night.

Xu Yun then rubbed his somewhat sore neck, bid farewell to Old Su, and returned to his small room to sleep.

A lot happened today, exhausting him both mentally and physically.

And since there was no Tifa in this era, naturally, he could only obediently sleep.

He slept through the night without incident.

....

The next morning early.

A faint voice suddenly reached Xu Yun's ears:

"Mr. Wang, Mr. Wang, it's time to get up....."

Xu Yun yawned and rubbed his drowsy eyes.

After coming to his senses, he suddenly felt something was amiss:

In past days, although someone would also call him to wake up, the commotion was mostly rough.

Either banging on the door or shouting, unlike today's gentle tone.

Then he put on his clothes and opened the door.

At this moment, he saw.

Yongzhu was standing outside with a slightly timid smile, holding a basin of water in his hands, showing none of the casualness of yesterday when he casually called him 'Wang Mazi':

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