The reason why Gu Yi customized dozens of large triangle-like wooden buckets in [Shuiputun] was to dig out the delicate placer gold in the mud and sand.

This triangular wooden bucket is also called "gold bucket" or "gold plate", which is a common tool used by Gu Yi and his gold diggers in the world, although it has only been seen in a documentary, but it does not prevent Gu Yi from copying it, after all, that thing does not have any technical content, just a few wooden planks spliced together.

With this thing, Gu Yi and they don't have to shake themselves to death in the water with a heavy copper vessel like last time, they only need to hold the gold bucket with both hands and let it float on the water surface and shake it gently, so that they can easily wash away the lighter sediment and filter it through the continuous shaking of the water flow, and wash out the heavy placer gold.

Gu Yi just demonstrated it to the others, and then handed over the job to those miners, so the miners who had just finished working as construction workers turned into gold diggers, and slowly shook them off!

As for the quartz sand that was scooped out by the way, Gu Yi couldn't use it for the time being, so he could only find a vacant lot to pile up there for the time being.

Even if a large piece of quartz stone is fished out, Gu Yi will not have time to deal with it for the time being, because there are still a large number of mica blocks mixed in it, and people who have never heard of this world also like mica, although quartz stone and mica stone look almost indistinguishable.

After all, with only theoretical knowledge and no practical experience, Gu Yi had to conduct a lot of experiments to master the accurate material ratio.

Fortunately, the koji made a few days ago can already be used, although because of the different sizes of the jars and the different fermentation temperatures, some of them are not ready to be moldy and spoiled, but Gu Yi made a total of 1,000 kilograms of koji embryos, even if some of them are broken and dried, the remaining koji can also have hundreds of kilograms.

Gu Yi classified the fermented koji that were slightly different due to the size of the jar and the fermentation temperature, and prepared to brew them at the same time, trying to taste the best.

And because Gu Yi made sweet wine koji this time, he could only make rice wine for the time being, and handed over the gold panning work to the miners, and when he was pounding the koji, he commanded some carpenters who were skilled enough to build a water-powered mill according to his requirements.

It is not difficult to build a hydraulic mill, after all, the technical content of this wood product is not high, and as long as you see the real thing, you can basically draw a rough structural drawing.

And before Gu Yi came to this world, he liked to stay at home and read the "farming texts" posted on the Internet, and those "predecessors" who had the same experience as him almost used these things as "golden fingers", and the research and analysis were very simple and thorough.

What is ironic is that there are even boring people who have specially sorted out the various gold fingers used by the protagonists in the farming text, and sorted out something called "Gold Finger Usage Guide", which describes in detail the manufacturing and use methods of various gold fingers, and "The Doomsday Survival Guide of the World Realm" and "Bei Ye Wild Survival Book" are called "Three Treasure Books".

At that time, I just thought it was interesting, and I studied the Gu Yi of the "Three Treasures" in detail with a playful mentality, and I had to thank those "predecessors", if it weren't for them, living in a modern city, even the otaku who couldn't even distinguish between leeks and wheat seedlings, where would they know the structure and principle of these ancient and primitive instruments?

But when Gu Yi himself entered another world, he suddenly found that thousands of "predecessors" had set a good example for him, and those boring people who worked hard to collect information and compile the "Three Treasures Book" also laid a solid foundation for him and paved the way to become a "great inventor", which is also the reason why Gu Yi is currently in trouble, but still retains a "confidence".

Although the tools were primitive and crude, these skilled miners still quickly followed Gu Yi's instructions, relying on wooden wedges to fit, and made the first small Ferris wheel-like hydraulic mill without a single nail.

The five-meter-high water wheel, driven by the strong water flow at the outlet of the underground river, squeaks and rattles and rotates, and the stone mill rotates through a thick central shaft connecting levers and gears, and the wooden pestle attached to the other end of the stone mill is like a chicken pecking rice, pounding into the stone mortar one by one, making a "clang" sound.

The crowd who had never seen such a miraculous instrument exclaimed again and again, the water wheel could make the stone mill and the wooden pestle rotate and stir up by itself without manpower, but unfortunately, before the water wheel rotated for a long time, the part connecting the shaft began to smoke, and in the exclamation of everyone, there was a terrible "click" sound, and it broke and collapsed.

The strength of the transmission shaft is not enough, which can make Gu Yi almost scratch the scalp, I used to see the "predecessors" "invent and create", as if it was simply like burping and farting, a few words can develop the agricultural era into the industrial age, and so on to really do it yourself, but found that it is not so easy at all.

In desperation, Gu Yi could only let Ge Qiao, the kid, risk his life and beg the old man to help make some metal parts, thinking that under the guise of processing wine raw materials, the old man who wanted to drink should not refuse.

Ge Qiao took the structural diagram of the parts drawn by Gu Yi on the leather paper, and went to the fire cave with trepidation, but fortunately, he succeeded in getting the old man to agree to help, and he made a batch of key components in half a day, and finally set up the water wheel again.

After several hours of rotation without failure, Gu Yi breathed a sigh of relief and announced that the hydraulic mill had been built!

The excited miners didn't even need Gu Yi's instructions, they took the initiative to fetch millet and pour it into the stone mortar, looked at the wooden pestle like a donkey's head with great interest, scooped the millet grain in the stone mortar to remove the bran, and from time to time let out exclamations of "What a great strength!", "Pound fast and good!".

With the first one, it is naturally not difficult to follow it, and after a little adjustment of the strength, angle and other details, the miners with a large number of people quickly set up the second, third, and even tenth water wheels, and at the same time rotated on the trap river.

But after the establishment of the water-powered mill, there is also a distressing problem, that is, the attraction of these leopards is too great, and they can't help but touch this one and dig it out, trying to figure out how the big wooden plate that is slowly turning by the water makes the stone mill and wooden pestle move.