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Signature	Maker	Instruments	Comments	Location	References
NORMAN, ROBERT	England, c.1550-1604, MIM	Variation Compass = X.	invented a dip needle, c.1576, to measure the vertical component of magnetic force; the compass is illustrated in William Borough's book; author, compass maker.	Ratcliffe, London.	Taylor 1(29); Michel 3; Evans 1; Dewhirst; G.L'E. Turner 24; Clay and Court; USNM; J.A. Bennett 2.
NORMAN, ROBERT	England, c.1550-1604, MIM	Variation Compass = X.	invented a dip needle, c.1576, to measure the vertical component of magnetic force; the compass is illustrated in William Borough's book; author, compass maker.	Ratcliffe, London.	Taylor 1(29); Michel 3; Evans 1; Dewhirst; G.L'E. Turner 24; Clay and Court; USNM; J.A. Bennett 2.

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