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![]() Astrolabe They were intended to be cut out and pasted on to board or pasteboard, and they offered a cheap alternative for those who could not afford the expense of brass. The advantage for the maker, of course, was that one engraving would suffice for many instruments, but he had to have mastered the skill of engraving in reverse. The fact that this paper astrolabe is signed has allowed an unsigned metal astrolabe in the collection of the Museum of the History of Science in Oxford to be attributed to Danfrie: see Epact 63059. |