Chapter Ninety-Eight: Micrometers

Su You said: "Now we have three points, the intersection point between the small circle and the left side of the horizontal axis is point A, the intersection point with the right side of the horizontal axis is point B, and the intersection point between the big circle and the bottom of the number axis is point C. “

"Now we draw a ray from point A, and from point A, we take out five equal segments on this line with a compass to get a point of Ding."

"Connecting point B and point D to get a line segment, and then making parallel lines for that line segment at each tick point, divides the diameter of the small circle on the horizontal axis into five equal parts, which is the method of dividing any straight line that we have learned."

"The next thing is the key, as long as we make the line between point C and point A and point B, and extend it to intersect with the small circle, we can also get one, two, three, four points."

"We only need to make four symmetrical points on the other half of the small circle corresponding to these four points, plus A and B, a total of ten points, and these ten points are exactly divided into ten equal parts."

"Every other point is connected, and a regular pentagon is obtained, which means that these five points exactly divide the small circle into fifths."

After saying that, the line segments were connected, and sure enough, a regular pentagon appeared on the inside of the circle.

Everyone below was amazed, this method was really ingenious, and the babies took out the ruler rules from their schoolbags and did it in their notebooks.

After everyone had done it again, Su You asked them to divide a circle into seven equal parts and thirteen equal parts, and then he said: "You have studied with me for so long, so the requirements for you cannot be the same as Uncle Shi and Grandpa Shi." ”

"You don't just know the method, you have to prove why it's done in equal parts."

"Go back, teach others how to do it, and then discuss together how to prove it. Tip, you can start with a third, and then think about it from an angle, you should get the easiest way to prove it. ”

In a class, Shi Tong seemed to understand but did not understand, and Shi Fu's eyes were even more black.

Looking at a group of excited and inexplicable babies, Shi Fu muttered, "They all understand?" I don't understand the co-authorship alone? ”

Shi Tong patted his ass on the side: "Actually, I don't understand it too much......"

Then he was slapped on the head by Shi Fu: "A group of babies can't compare to you and are embarrassed to talk?!" If you don't understand, you're not allowed to eat tonight! ”

Shi Tong: "......"

After filming Shi Tong, Shi Fushi debugged the spring forging machine he brought.

The spring steel plate is almost the same as the spring steel plate of the suspension device used in later automobiles, but on the other hand, the center is hung on the clutch driven wheel of the waterwheel through a connecting rod, and the other two connecting rods are hung at both ends, and the two ends of the forging hammer are hung below.

The hammer resembles a solid doctor's cap, and the iron plate has four round holes around it, pierced into four steel posts.

The steel column is fixed around the base of the forging machine.

As soon as the machine rotates, the forging hammer can move up and down along the steel column, and under the influence of the spring, it also keeps jumping up and down during the movement.

After adjusting the height of the base, Shi Fu shouted to Su You: "Oil baby turn on, let's try the effect!" ”

Su You's side had already burned the smelting furnace, and a few iron bars were lost in it.

Soon the iron bar burned red, and Shi Fu latte tongs clamped the iron bar and put it on the base of the forging machine.

Su You pulled the clutch down, locked it, and the machine began to move.

"Dangdangdang...... Dangdangdang ......" Shi Fu stretched the iron rod forward and retreated on the forging machine, and in a blink of an eye, the iron rod was flattened into an iron plate.

The forging hammer was raised, Shi Fu put the iron plate of the hammer into the fire and burned it again, and took out an iron rod to put it on, and his mouth smiled crookedly: "Okay!" That's great! ”

Su You was also happy: "That's just right, give me a few more sets of knives, there are many people in the family, and one knife is not enough." ”

Shi Fu glanced at him: "Good steel is not so bad!" I'll teach you a trick today, and you're good at it! ”

Shi Tong also put a few iron bars he brought into the fire: "Master, good steel needs to be used on the blade, and today I will see my father and I show it to you." ”

Readjusting the height of the base, Shi Fu put the red-hot steel sheet on the seat, and Shi Tong took a chisel like a small flat-mouthed axe with a long handle, and after a while, the steel sheet was cut into thin strips the width of the index finger.

Then Shi Fu began to forge a few thick iron strips that he brought, and after forging them into sheets, he used a chisel to cut out a lot of holes on one side.

At this time, you can see the value of the craftsman, the distance between each opening is almost exactly the same, and it is impossible to do this step without years of practice.

Clamp the iron sheet that is still red on the vice, and use small pliers to break the iron teeth in both directions, and snap the originally cut thin steel sheet into it.

Then it is put into the furnace and burned red, taken out and continued to be forged, and the steel and iron are soon forged into one.

At this point, Su You understood: "Wonderful, wonderful!" What a great way to cut corners! ”

Shi Fu rolled his eyes: "It's right to cut the material, which eye did you see that I cut corners?!" ”

Shi Tong muttered on the side: "With the forging machine, it is indeed a lot of work, and what the master said seems to be right......

In any case, a few pieces of iron with steel inlays were soon built, and Shi Fu really saved materials to the extreme, cutting the iron pieces to the size required for the knife, and then using the thick iron and iron pieces alone to create the part of the plug handle - preferring to spend a lot of labor rather than waste a star of good steel.

The next step is fine-tuning, which can only be done by hand.

Soon the knife shape is punched, the blade is thinned, and it is sharpened with a grinding wheel.

The grinding wheel is now extremely convenient to make, because with water glass, with quartz powder or corundum powder, that is, jade sand, add a certain lubricant such as graphite, copper powder, mix with water glass, after pressing and roasting, you can make the desired grinding wheel of any shape.

The main purpose of roasting is to allow the water glass to react with carbon dioxide and at the same time produce partial porcelainization.

In addition to the grinding wheel, it is also possible to use metal sheets as a substrate and spray them with a spray gun to obtain metal and stone cutting wheels.

Water glass reaction products can withstand acid and high temperatures, and the temperature generated by grinding and cutting will not lead to melting and desanding, which is still used in later generations.

A large pot hangs on the grinder, and the outlet of the large pot is covered with a three-layer silk sleeve, which is half hung down, and the amount of water can be controlled by the number of turns of the sleeve around the spout.

The lathe with higher precision, the Shi family father and son are still renovating, and before the brass ball valve comes out, they can only use this method to make do.

The Shi father and son began to sharpen their knives, and the children went to help make wooden handles and knife boxes.

In the evening, several sets of knives were built.

According to Su You's requirements, a set of knives includes five bone chopping knives, picking knives, fish knives, slicing knives, and melon and fruit knives.

Each set of knives has a wooden box for storage, similar to the kitchen set of later generations.

Su You took out the slicing knife to take a look, and saw that the boundary between steel and iron at the blade part formed a regular wavy dividing line, and he couldn't help but sigh: "It's completely different from the burning edge line, this steel inlay technology is really amazing!" It can be described as beautiful! ”

Shi Fu couldn't laugh: "You really know everything, but you don't know this?" ”

Shi Tong explained with a smile: "Master, this is a literati who turned to blacksmithing, and it is not uncommon for him to not understand traditional crafts. Master, this is called horsetooth inlay, and the blacksmiths of the Great Song Dynasty who have a little bit of a door will do this, after all, steel is still relatively expensive, and the iron mill will generally save it. ”

Only then did Father Shi think of another question: "Oil baby, do you need to use five knives to cook a meal?" I'm afraid that the chefs in the palace are not as particular as you, you are the only one in the Manda Song Dynasty, right? ”

Su You danced with a large knife: "Tonight, let you taste the authentic Su family's back to the pot meat!" ”

The so-called Su's back to the pot meat is the name of Su You's blind taking, which is actually the Lianshan back pot meat of later generations.

The method is actually the same as the ordinary back pot meat, the difference is only in the knife method, the ordinary back pot meat is cut out, and the mountain back pot meat is a large blade.

The meat was brought by Shi Tong from the city, knowing that the master likes to scratch on the mouth, and everything else is easy to say, every time fresh meat comes, he must bring several catties.

said that it was filial piety, but in fact, he ate more than two Su oils alone.

Cook the rump until it is just cooked, let it cool, swing it sideways, trim it on both sides, and then use a large knife to start slicing from the top.

The resulting slices of meat are thin and large, about the size of an adult's palm.

Then the meat slices are fried in the oil pan, the excess fat is excreted, the bean paste, the black bean sauce, the ginger is stir-fried, and then some soy sauce, spicy rice oil, green garlic seedlings are stir-fried, and the salt can be out of the pot.

Today, there are guests, in addition to the ordinary dishes cooked by the group, Su You added this as a treat.

Hachiko came back to accompany the guests, and when he saw this plate of back pot meat: "This meat slice is really big enough, if you don't have a whole bottle of good wine, I'm sorry for this dish." Hengzhi, do we drink citrus wine or osmanthus wine? ”

Shi Fu happily frowned: "Hachiko, you have said so much wine?" ”

Ba Cheng opened the cabinet to choose wine, there were more than a dozen porcelain altars of various colors inside, and when he heard the words, he turned his head and pointed at Su You: "Ask him!" It's been a good day...... Blessing Oh......"