Chapter 9, Venture Capital.

Upon entering the inner courtyard, Su You said to Cheng Wenying, "Brother-in-law, this caliper..."

Draw a horizontal line, and you will obtain an accurate ten on the graph.

Su uses this ruler to move along the right angle side, when the scale moves to the side of the figure and the distance to the outer oblique side is exactly one inch, eleven oblique lines divide this inch on the ruler into ten parts.

The old craftsman is skilled and efficient. Soon, he marked the precise inch on the ruler with precision.

The old man's heart was scratching like a cat: "Mr. Xia, please don't praise me anymore. If you keep praising me, I won't know where to put my old face. Why don't you show us how to measure to the millimeter level instead?"

The old foreman gave a deep bow to Su You and said, "With this ruler, my bookstore in Meishan will surpass Hangzhou Jianyang from today on. Sir, please accept an old man's bow."

A senior craftsman, probably the foreman, hurriedly said, "Young man, let me handle this."

Su You said, "This involves arithmetic. I call this problem 'chasing differences.' Everyone knows addition and subtraction in arithmetic, right?"

After speaking, he looked at the ruler and shook his head, saying, "The craftsmanship of the old master is truly exquisite."

Su You's impression of Cheng Wenying is getting better and better. He got up and saluted, saying, "Nephew understands that these are just ordinary idle thoughts and miscellaneous studies that are not relevant. When he starts his education, he will focus on studying the classics."

Su took a wooden block and said, "The key to this caliper is that when the subordinate ruler reaches the end of the main ruler, the starting scale of the two rulers is unified, and at the same time, the inner sides of the two caliper jaws are tightly attached."

Cheng Wenying asked, "What kind of thing could make you all so surprised?"

Amidst the cheers of the crowd, the old craftsman's face was full of confusion as he asked, "Young man, what is the reason for this?"

The two clips at the front of the caliper are used to measure the width of an object, so I call this ruler a vernier caliper.

Wait a moment, but isn't the young man only five years old? Then, at my age, wouldn't I be living until the belly of a dog!

Cheng Wenyin breathed a sigh of relief and said, "That's good, that's good... Just now you mentioned that this thing still has great use?"

Afterwards, Su You began to explain the principle of the vernier caliper. After a lengthy explanation, Su You summarized, "Assuming that the width currently being measured by the caliper is one inch, three points, and nine millimeters, after careful calculation, at the ninth mark on the vernier scale, the difference between it and the corresponding mark on the main scale is exactly zero, and the difference has been eliminated."

By utilizing this feature, we can magnify the unit of "centi" to the scale of "decimeter" and obtain precise centimeter measurements.

Even though it is so, I dare not boast that it is flawless, and I cannot accept the young sir's exaggerated praise. This is only a temporary makeshift model for now. I will make a practical one for the young sir another day.

Suyou quickly waved his hand and said, "I dare not, I dare not. You are a respected elder at https://m.hetushu.com, but I absolutely cannot comply."

The old man nodded repeatedly: "This name is very appropriate."

A craftsman with sharp eyes: "Yes, indeed, the sixth mark above the sub-scale is nearly coincident with a mark on the main scale."

Su You discussed with Cheng Wenying about what Ba Niang had in mind. Cheng Wenying sighed and said, "Ba Niang, as a family, we shouldn't have such estrangement. If there is something, we should inform our father-in-law or even tell me."

Suyou said: "How much exactly? Let's take a look at the vernier scale. Is the position corresponding to the main scale gradually approaching a point at both ends of the vernier scale? The closer it gets to that point, the more the scales on the main and vernier scales tend to overlap?"

A loud noise erupted in the workshop, and immediately there was a buzz of voices. This was the first time everyone had witnessed a ruler that could measure with millimeter precision!

The old craftsman waved his hand repeatedly, saying: "My family has been in the carving business for three generations. The skill of carving fine wood is a family tradition. I have finally become a master in my generation, so I am in charge of carving the blocks for the printing house for my employer."

After finishing speaking, he introduced to the craftsmen: "Everyone, look, this one in the middle is the main ruler, and the one below that can slide is the auxiliary ruler. The scale on the auxiliary ruler can move on the main ruler. The markings on top, I call them the vernier."

Cheng Wenying saw Su You and Ba Niang mixed in a group of craftsmen. He frowned slightly but didn't say anything. He only said to the old foreman, "Lao Yu, did you hear the noise from this workshop in the inner courtyard? Have we abandoned our rules?"

Suyou smiled and said, "Then it will trouble you, sir."

Cheng Wenyin grabbed Su You's wrist with one hand and held a vernier caliper with the other, saying, "Nephew, come with me to the inner courtyard for a detailed discussion."

The old foreman handed the ruler to Cheng Wenying: "Boss, take a look, this is a divine ruler that can measure to the millimeter!"

Su You smiled and said, "Exactly, afterwards, by using nine to ten, the measurement can be displayed above these nine-minute marks."

Then, Su You connected each inch marking point on the lower right angle side with the other vertex of the right-angled triangle at a forty-five degree angle. Together with the hypotenuse, nine dividing oblique lines were obtained.

Cheng Wen should be greatly shocked: "How is it possible?"

Su You looked at the shining and impressive calipers, feeling very impressed: "The exquisite skill of the old master can be considered the pinnacle."

Suyou wedged the piece of wood and said, "Everyone, take a look. The starting point of the main and auxiliary ruler scales, which I call the zero point, can be used to determine that the width of the wooden block is one inch and five fen."

The foreman pointed to the new right-angled triangle and said, "This scale here is nine-tenths of an inch. Does the young master want to get nine-tenths of a share?"

Old foreman quickly bowed: "Congratulations to the boss, it's a great joy! The young master has invented an extraordinary thing!"

Everyone nodded in agreement, this is something they all know how to do.

A group of craftsmen couldn't help but admire it wholeheartedly. Being able to make things is one thing, being able to explain the principles behind them is another.

Even Bama ignored, Bama smiled and obediently followed from behind.