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  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, with case.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, detail view.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, detail view.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, detail view.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, detail view.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, with case.
  • Keuffel & Esser Model 1740 Thacher cylindrical slide rule, front view.
  • Keuffel & Esser 1740 Thacher Cylindrical slide rule, with case.