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Signature	Maker	Instruments	Comments	Location	References
NUNEZ, PEDRO	Portugal, 1542,		wrote many books on navigation; invented the "nonius" scale for dividing the quadrant; this was a series of concentric arcs, the outer divided into 90 parts, the second into 89 parts, the third into 88 parts and so on to the innermost arc which was divided into 46 parts; the alidade could thus read to within 30" of arc; Tycho Brahe was the only one to make use of the idea, but not very successfully.		Daumas 1.
NUNEZ, PEDRO	Portugal, 1542,		wrote many books on navigation; invented the "nonius" scale for dividing the quadrant; this was a series of concentric arcs, the outer divided into 90 parts, the second into 89 parts, the third into 88 parts and so on to the innermost arc which was divided into 46 parts; the alidade could thus read to within 30" of arc; Tycho Brahe was the only one to make use of the idea, but not very successfully.		Daumas 1.

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