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Narratives

Orrery Collection plane table and alidade

R.T. Gunther printed Thomas Wright's 1731 "An Inventory of the Mathematicall Instrumts: in the Library of the Rt Honle: ye Earl of Orrery Deceast" in Early Science in Oxford, vol. I (Oxford, 1923), 380-382. The third section of the list is "In the Great Room, the first Drawer" and begins with item 18:

"A small Plane Table, Ball & Socket, & a brass Index and Sights"

At p. 374 Gunther describes the plane table and this particular alidade and illustrates them together on the facing plate. Although the alidade is perhaps a little large for this size of table, it seems a plausible pairing of surviving items.

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