This is just cartography
Things like this mapping stuff are probably unimaginable to students, right?
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Alright, the browser can't send images. Here's the situation: the medium for making the diagram is a steel plate coated with purple liquid. There are steel plates measuring 30cm. At the initial stage, the edges of the steel plate need to be filed, then the purple liquid is applied, and only afterwards is the diagram made. The tools include a compass (pointed on both ends), a hammer, a scribe, and an iron needle for punching dots.
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