The old blacksmith's surname is Niu, and he is quite confident in his craft. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Master Niu said to Sun Yi: "I heard that Lord Lidel is gathering the bowl for dinner, and I want to ask the master, is the iron bowl okay?" ”

"Iron bowl?" Sun Yi was stunned, "Do you have a way to build a large number of iron bowls?" ”

Master Niu shook his head, "It's definitely not possible to build, we can cast!" ”

Cast iron bowls? Sun Yi never thought about it.

However, since thin and large iron pots can be cast, it should not be a problem for the blacksmiths of the Ming Dynasty to cast a few iron bowls.

Iron is more active than tin, and the iron bowl can be used directly as the negative electrode of the battery.

Another advantage of using an iron bowl as an electrode is that the effective area of the electrode has been expanded many times at once.

The idea was opened, and Sun Yi came up with an idea, "It doesn't have to be in the shape of a bowl, as long as it doesn't leak!" It's okay to have thicker walls! ”

The bull blacksmith said: "Then simply make it into a square bowl, the mold is easy to make." ”

Sun Yi thought for a while and said: "Don't grind off the burrs on the bowl wall, the more burrs the larger the contact area, the better the effect!" ”

The bull blacksmith laughed and said, "That's simpler, you said how many you want." ”

"A hundred!" , Sun Yi stretched out two fingers, "It's no problem to make another hundred if you use it!" ”

The blacksmith counted three times with his fingers, "Make it smaller, and I estimate that the iron will be able to do so." ”

Sun Yi didn't expect the iron materials in the camp to be so tight, so he hurriedly took out a copper coin, "As long as you can put down the copper coin!" ”

The ox blacksmith stared at the copper coin fiercely a few times, and said, "Make it square!" I can't put the copper coin horizontally, but I can put it along the way. Enough is enough! ”

Sun Yi breathed a sigh of relief.

Blacksmith Xue interjected: "What if you knock the copper coin into something else?" ”

Sun Yiyi: "Of course, but the tin bar can't be submerged in water." ”

Blacksmith Xue recalled the appearance of the "money string" and asked: "If you take the copper wire to string the money eye, can you bury the copper money and even the copper wire in the water?" ”

Sun Yi replied "yes".

Blacksmith Xue said: "Then simply turn the copper coin, knock it into a flat piece, and then knock in a section of copper wire while it is hot, and the iron can can be made smaller." ”

Sun Yi gave a thumbs up, "Good way!" ”

At that moment, Sun Yi couldn't take care of the hare, so the three of them returned to Sun Yi's shack and carefully discussed the size and shape of the iron cans and copper sheets.

Sun Yi also made a model out of aqueous stone powder.

Master Niu stared at the model for a long time, and said, "Master's method of using gypsum as a mother mold, can I use it in the future?" ”

Sun Yi spread his hands, "Use it casually!" ”

At dinner time, the camp was filled with the smell of stewed hares.

The robes kept two of the captured hares, and gave the rest to the orphans. In the words of the fifth brother, "The copper wire is already there, and you can set the hare at any time in the future, the dolls are pitiful, and the dolls will mend their body bones first." ”

The orphans argued and struggled for a long time, and gave one to Sun Yi, one to the wounded, and two for themselves, one for the first meal, one for the second meal, and the rest for the people who had helped them before.

Sun Yi picked his teeth with a willow branch, and while reminiscing about the taste of the hare, he scolded in his heart: "His mother's, the hare meat I used to buy for dozens of dollars a plate in the restaurant is actually fake!" ”

The flower head cabinet came to say goodbye.

The caravan is preparing to depart. The caravan's first task this time was to buy back the seeds that were urgently needed in the camp, and the second was to advertise the salicylylic pill and the runjiudan. A group of eight people planned to take a sheepskin raft down the Yellow River to Bansheng City, and then hire cattle to camel the goods and come back on foot.

Together with Wang Erniu, he sent the caravan out of the camp, and Sun Yi came back and plunged into the "battery array".

Little Pomegranate is still responsible for taking care of the 200 batteries and charging the power bank. She had to stir the water in the battery constantly, and from time to time she had to add new water to the battery.

The little girl was busy coming and going, often taking advantage of Sun Yi's inattention to secretly taste a mouthful of water and taste the electrode.

-- If the taste of the water in the bowl is weak, you should add the water.

-- The water in the bowl tastes normal, but if you can't taste the electricity, you have to stir it, and if you still can't taste the electricity after stirring, you have to check whether it is not connected.

Sun Yi connected 12 bowls by himself and tried to charge one of the No. 5 batteries of the flashlight.

Sun Yi's battery has low voltage and weak current, and can be directly connected to a 1.2-volt rechargeable battery. Then use the switch of the charging circuit to control the human intelligence: touch the No. 5 battery from time to time, it is normal to heat up slightly, if the battery is very hot, disconnect the power supply and cool for a while.

Although the process was stumbling, it was always moving forward step by step.

Unexpectedly, in the afternoon, Niu Blacksmith, Xue Blacksmith and an orphan who temporarily helped came.

The three of them held a large pile of iron cans, "banged", and fell to the ground.

The bull blacksmith proudly announced, "Lord Lidel, I've delivered the work to you." No more, no less, a hundred in total! ”

Sun Yi was taken aback, "So fast? ”

Sun Yi picked up an iron can and looked at it. The tin can is a flat rectangular shape, two inches high and one cent thick. There is also a small piece sticking upwards from the open side of the jar, which is specially left for the binding post. It looks exactly like Sun Yi's plaster cast.

Niu blacksmith said: "I used the master's method, and after a while, I made dozens of gypsum molds, dozens of molds turned sand together, and cast together, which is very light!" ”

Sun Yi was very satisfied.

Niu Blacksmith was a little pretentious, "If it weren't for helping Lao Xue make copper sheets, he would have been able to work earlier than this." ”

Blacksmith Xue was constantly pulling copper electrodes out of a cloth pocket.

These copper electrodes have lost the appearance of copper coins and have become rectangular sheets, the size of which is just the right size to fit in an iron can. On one side of the copper sheet is a three- or four-inch copper wire.

Sun Yi was taken aback again.

The copper wire on the copper electrode is uniform in thickness and is obviously uniformly drawn through the drawing die. The so-called wire drawing die, simply put, is a thick iron plate, on which trapezoidal through holes of different sizes are drilled, and the thick copper strip is stretched into a copper wire of the same size as the through hole every time it passes through the hole.

Sun Yi asked incredulously: "Your mold can drill holes in the morning?" ”

Master Niu was as happy as eating honey: "The copper wire of only No. 10 does not need to be drilled at all, it is a pig iron mold cast by me, and it can be used after a little polishing!" ”

Sun Yi was completely convinced, and the people of the Ming Dynasty were good at casting.

Sun Yi took a copper electrode, dipped the end of the copper wire in a bowl of water, applied it back and forth several times on the iron binding post on the iron can, took a red-hot iron wire and tin foil strip, and soldered the copper wire to the iron can.

This time it was the turn of Master Xue of the Ming Dynasty to be surprised,

"Master! What kind of water are you? ”

"I usually make copper kettles for people, and I also use tin for soldering. But the iron is not stained with tin, why can it be welded together by wiping the master's water? ”

Master Niu coughed a few times and glared at Master Xue fiercely.

Sun Yi didn't even raise his head, "This is called squirting water, which I made by lighting nitrate and sulfur together and dissolving it in water, which can remove rust and oxide layers...... It's the blackened layer of copper and iron. Tin can solder copper because you remove the oxide layer on the surface of the copper with copper rubbing water in advance; Iron does not eat tin, also because there is an oxide layer. I still have a lot of strong water here, and you can bring some back in a while, and you can use it to rust. ”

When Master Xue heard this, he took out a pair of rusty iron tongs, soaked them in it, and then took them out and wiped them a few times with his sleeve, and the rust was indeed gone.

Master Niu was a little sweaty, and muttered: "I made some copper water there, and I will bring some to the master to wipe the copper sheets." ”

Sun Yi concentrated on his work, "Don't, don't bring it." I can't smell the stinking water, so I'll go to you if I want to use it." ”

Master Niu sweated profusely, it turned out that the master had already known the formula for rubbing copper water......

The little pomegranate came to help, and a few people worked hard to weld a hundred iron cans, and then poured the water into the tin cans.

Sun Yi still cautiously started by measuring the voltage of the canister. One, two, three, and when the fourth jar was connected in series, the diode immediately emitted a dazzling red light, which frightened Sun Yi and quickly disconnected the power supply.

In this way, the newly made iron can battery should be about 0.4 volts, which is much more current than the bowl battery with tin electrode.

Sun Yi connected 70 iron can batteries in series in one go,

Plug in the car charger, the light is on,

Connected to the power bank, the LCD screen lit up,

The battery symbol kept scrolling, and the 15% charge indicator hesitated and jumped to 16%......

After a few minutes, 17% ......

A few minutes later, 18%.

Sun Yi was so happy that he couldn't close his mouth, turned his head and shouted, "Milk baby, milk baby, make a few dishes, I will have dinner with the two blacksmith masters!" ”