Archive of Collections

Details and Image

J. Cail / Newcastle on Tyne
John CailEnglandIvory and Brass6 inc. 1850

Notes: "Thicker than most ivory sectors. When opened fully, the sector has several scales that run the length of the open sector: Scale of Decimals on the outer edge, Scale of Inches on the front face, & Lines of Artificial Numbers (N,S,T) on the rear face."

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