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

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

1823
Calculating scale for strengths of lenses

Calculating scale for strengths of lenses

Gladstone's cross gauge

Gladstone's cross gauge

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

Small ruled drawing (plan), 5 3/4 inches by 9 inches made of horn sheet for use with computing scale, 19 inches long

Ruled drawing for use with computing scale