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Re: Folio 57v & phebelabia...
Professor King has suggested that I look at "Deutsche und niederlandische
astronomische Instrumente des 11.-18. Jahrhunderts", Ernst Zinner (Munich,
1979 reprint of a 1967 original), which contains some phebilabia.
This has also prompted me to follow up on some additional volvelle-related
research leads I'd left open: I'll let you know how this goes.
Cheers, .....Nick Pelling.....
PS: GC, can you recall where you saw the 17-step / 270 degree moon-dials?