Wikipedia picture of the day on December 29, 2017: Rotring S0214750 bow compass with Rapidograph 0.5 mm technical pen drawing 1.5–15 mm diameter circles https://commons.wikimedia.org/wiki/File:Rotring_S0214750_with_Rapidograph_0.5_mm_drawing_1.5%E2%80%9315_mm_circles.jpg
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