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Inventory no. 27956 - Former Display Label

English 9-INCH SLIDE RULE
c.1700

Ivory and brass. Signed, "I: Rowley. fec:"; Undated.

The rule was described by Thomas Wright in his catalogue of the Orrery Collection (1731) as "A 9 inch Ivory Sliding Gunter". The scales marked are M[eridian line], S[ines], T[angents], E[qual] P[arts], N[umbers] and C[hords].

[Orrery Collection, no. 22]
Lent by Christ Church.

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