Mathematical instruments

Quadrangle Book III, Chapter 9, No. 47
Book III, Chapter 9a, No. 47  Source: Harleian Ms.2027 f.300v, Drawing d

a: line of level
b: line of height
C: line of height upright
f & g: the scale each which is to be divided into 12 parts or 60 or 100
f: the contrary shadow
g: the right shadow

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