The Rolling Device of Naṣir al-Dīn al-Ṭūsī in the De spera of Nicole Oresme?

@article{Kren1971TheRD,
  title={The Rolling Device of Naṣir al-Dīn al-Ṭūsī in the De spera of Nicole Oresme?},
  author={C. Kren},
  journal={Isis},
  year={1971},
  volume={62},
  pages={490 - 498}
}
DURING HIS CAREER AT PARIS the French Schoolman Nicole Oresme wrote a series of questiones or problems on the popular and influential De spera of Sacrobosco.1 In the final questio (No. 13), which treats wlhether or not celestial bodies are moved circularly (Utrum quodlibet corpus celeste moveatur circulariter), there is a section which purports to describe how to produce a back-and-forth rectilinear motion by combining three uniform circular motions. The passage in its entirety appears below: 
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