Iron Dynasty

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Rules—in ancient times, the word referred to two different tools: the gui and the ju. The gui was a compass, and the ju was a straightedge used for drawing lines.

These two instruments were the ancestors of ancient measurement tools.

Because of this, Xiao Ming didn’t have to rack his brains figuring out how to make compasses and rulers. The Great Yu Empire already had them.

Now, unifying weights and measures was simply an improvement—not a complete overhaul.

So, Xiao Ming asked Chen Wenlong to bring him a compass and a ruler. He then used them to measure out millimeters, referring to the scale in the technology crystal. By walking the compass along the ruler one step at a time, each mark became one millimeter. At each point, he made a dot.

When he had walked one full meter, he stopped. Then, he began drawing vertical lines, clearly marking millimeters and centimeters, and labeling them.

To ensure precision, he worked for a full hour before finally finishing the ruler.

He then compared it against the ruler shown in the technology crystal, and found it almost perfectly matched—there were only microscopic errors, which he couldn’t help.

For Qingzhou’s current level of industry, this ruler was more than sufficient. At this stage, no machinery could be completely free of error anyway.

Once the ruler was completed, Xiao Ming handed it to Chen Wenlong and instructed him to use it as the standard for all production—and to distribute it across all workshops in Qingzhou.

“Your Highness, is it really okay to change the entire empire’s system of measurement like this?” Chen Wenlong asked. He was still more comfortable with the traditional system, and the new ruler made him uneasy.