Mathematical instruments

Equinoctial Dial Book III, Chapter 9, No. 54
Book III, Chapter 9a, No. 54b  Source: Harleian Ms.2034 f.211v, Drawing a

top: ring; index
centre: index for the days of the month
Book III, Chapter 9a, No. 54b  Source: Harleian Ms.2034 f.211v, Drawing b

top: elevation of the pole
centre, outside: great meridian circle
inside: the ecliptick circle
left: the pole or axis

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