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Signature	Maker	Instruments	Comments	Location	References
ROTZ, JEAN	France; England, fl.1540-80, MIM		made an elaborate compass of variation for Henry VII; developed an armillary ring sundial with sights, mounted over a compass and called by him a "differential quadrant"; his father might have been a Scot.	Dieppe; London; Dieppe.	Taylor 1(15); A.J. Turner 10.
ROTZ, JEAN	France; England, fl.1540-80, MIM		made an elaborate compass of variation for Henry VII; developed an armillary ring sundial with sights, mounted over a compass and called by him a "differential quadrant"; his father might have been a Scot.	Dieppe; London; Dieppe.	Taylor 1(15); A.J. Turner 10.

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