Voltaic stack, as the name suggests, is actually a "pile", which is composed of stacked "voltaic electric layers" one by one.

Richard placed a zinc ring on a copper ring and pressed it with a piece of linen soaked in salt water to create a "voltaic layer." Next, Richard re-placed the zinc and brass rings on top of the linen and pressed the linen. After repeating the operation a dozen times, a column is erected in front of you, the so-called "voltaic stack" - a rudimentary battery - with a negative electrode at the top and a positive electrode at the bottom.

Without hesitation, Richard quickly connected the metal wire, felt the strength of the current of the volcanic stack, raised his eyebrows slightly, and then calmed down.

It is true that compared with fruit batteries, the current of the voltaic stack does become stronger, but the strength is limited, and there is no change of magnitude (tenfold).

Of course, if you want to forcibly use this kind of voltaic stack, it is not impossible, the current is too small can be increased by the voltaic stack "parallel", and the voltage is too small can be increased by the volcanic stack "in series". This is just the application of physics knowledge in modern earth and junior high school.

But Richard had to face a problem that the current and voltage of the voltaic stack were insufficient, and if he wanted to meet the standard of both, then he had to connect them in parallel and then connect them in series to form a huge "phalanx" of voltaic stacks. The current was used during meditation, and Richard was skeptical that he could have enough volatile stacks in his bedroom.

So...... Still can't do it.

Richard let out a sigh of relief, his brow furrowed.

The two maids looked at Richard in fear, and Richard kept frowning and thinking, and after a while, he tried again.

Since fruit batteries don't work, volcanic stacks don't work, then make Baghdad batteries.

Yes, the Baghdad battery.

If the voltaic stack is the first recorded power generator on the modern earth, then the Baghdad battery is the first generator that has not been recorded on the modern earth.

The Baghdad battery, unlike the rest, does not have a clear inventor, in fact, it was excavated from the ground by accident:

One day in the middle of summer in June 1936, outside the village of Gagatrabua, the capital of Iraq, near Baghdad, the construction of a railroad was in full swing. When the workers were preparing to lay the roadbed with shovels, they excavated an ancient mausoleum made of huge stone slabs, continued to excavate, and dug up an ancient sarcophagus.

Two months later, with the help of Iraqi archaeologists, the sarcophagus was carefully opened, from which a large number of artifacts from the ancient Persian era more than 2,000 years ago were discovered. There are twisted beads made of pearls, a large amount of gold and silverware, and a piece of pottery with a strange shape.

The pottery was the Baghdad battery, and after it was successfully restored, the current generated was maintained for 18 days before disappearing.

No one knows why chemical batteries existed more than two thousand years ago and were more advanced than voltaic stacks. No one knows how far the experiments on electricity had developed at that time.

Richard was also unaware of the puzzle, and now he was making the Baghdad battery to test whether it could meet his needs.

I hope so......

Richard thought, turning to the two maids and commanding again. This time it took a little longer, because the materials used were significantly more troublesome than the previous two batteries.

Half a day later, the materials were ready, and Richard was once again making them himself. The two maids watched with wide eyes, because they didn't know if Richard would let them imitate a new one after seeing it, after all, there was a precedent.

Richard moved quickly, first picking up a clay pot more than ten centimeters high, and then pouring viscous asphalt into it.

The asphalt also carries a certain amount of fluidity with temperature, and slowly deforms according to the shape of the clay pot. When the asphalt had filled most of the pot, Richard picked up a thick copper pipe about 3 percent in diameter. Align the asphalt in the tank and insert it so that the entire copper pipe is submerged in the asphalt.

Then Richard picked up a thin solid iron rod and inserted it into the copper pipe, carefully controlling the angle to ensure that the iron rod did not touch the wall of the copper pipe, and was a few centimeters higher than the copper pipe.

After doing this, I immediately began to pour acid into the jar, and bubbles came out, and the Baghdad battery was made. Connecting the copper tube and iron rod with a wire, Richard touched it, and immediately felt a much stronger current.

But after feeling it for a while, Richard's brows furrowed again.

It is true that the current is strong, but it is still not enough to change the bioelectric current in the body, and ...... The current of the Baghdad battery is extremely unstable, sometimes strong and sometimes weak. Although it is not clear what impact this will have on "opening up the source of law", Li perceives that it should be a bad one.

"Sure enough, it still doesn't work. Richard muttered, exhaling a cloudy breath. Shaking his head, he pushed open the door of the independent laboratory and walked out, and the maid Angel and the maid Luna hurriedly followed.

The rest of the maids in the hall couldn't help but cast jealous glances at the two of them when they saw that Angel and Luna were still with Richard. However, they soon noticed that His Royal Highness Richard, the prince, had an unhappy expression on his face, and Angel and Luna were even more flustered, and their eyes immediately changed to schadenfreude.

There is also competition between the maids, and it is very fierce, at this moment, in the eyes of the other maids, Angel and Luna obviously did not complete the task assigned by Richard and made Richard angry, which is good news for them.

"Da Da", Richard walked through the hall to the palace gate, and found that the time was close to the afternoon - before he knew it, half a day had passed.

After three experiments, the problem of current is still not solved, how to solve it?

Richard fell into deep thought.

Edward, the captain of the guard, showed up, and when he saw Richard, he wanted to remind Richard not to forget to eat lunch. But seeing Richard's brows tightly knit and pensive, his reason stopped and did not come up to disturb him.

The whole world suddenly became quiet, and the guards and maids in the palace were doing their work, trying not to make any sound, lest it affect Richard's thinking and make His Royal Highness the prince angry.

In this eerie silence, Richard pondered for a long time, looking for a solution to the problem.

After half a ring, Richard suddenly raised his head and looked at the square in front of him.

"Flutter Flutter ......"

Two gray finches skimmed almost against the ground of the square.

Turning his head to look above the palace door, in a corner, a spider was rapidly weaving a spider's web, a vertical web.

With his eyes narrowing slightly, Richard stretched out his hand and felt it, and found that the humidity of the air was increasing. Turning his head to look at the sky, the sun was still there, but the clouds were thickening, and the southern sky was getting darker and darker.

"It's going to rain?" Richard's eyes narrowed.

Theoretically, this is normal, after all, after several days of hot and dry water, a large amount of water vapor evaporates into the air, and there is a great chance of rain. It seems that it should not be small.

And when it rains, it is accompanied by thunder and lightning.

Thunder and lightning, as a kind of electric current in nature, are theoretically strong enough to know that they can change the bioelectric current in a person's body without thinking about it. But how to lead it down and control the use is a problem, after all, I don't want to be struck by lightning, then it is not scientific research at all, but suicide.

In this case......

After a moment, Richard turned around, had a plan, looked at Edward, the captain of the guard, and said, "Bring the craftsmen of the palace, I have something to tell him." ”

"Well, it's ......"