Ruling Pens
Ruling pen information. Alan Adams is a master geometer who has posted a superb explanation of all things to do with ruling pens: where to buy the best, how to use them, method of cleaning and sharpening them, etc. His post is at: https://www.drawingislamicgeometricdesigns.com/blog/steel-pens-ruling-pens
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Thanks Susan, this looks really useful!