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Panmetron, "universal scale" for measurement and calculation invented by James Jordan

1823

Gladstone's cross gauge

Calculating scale for strengths of lenses

Set of calculating scales, in boxwood, in mahogany case. 1 foot scales by Stanley, London, marked "W. Butterworth", small scales by Troughton & Simms, London. unnumbered Crown Agents series. Box marked "W. Butterworth" in pencil on underside of lid.

Calculating scales in mahogany case