Title
Thacher's Calculating Instrument or Cylindrical Slide-Rule
Thacher's Calculating Instrument or Calculating Slide-Rule. Series 4012, #700. Manufactured by Keuffel & Esser Co. of New York. Mounted on a metal frame with a 21 1/2" wooden base. Stored in a custom wooden box labeled "Ledder & Prost, surveying instruments, drawing materials, 287 Washington St., Boston, Mass." Accompanied by 2 instruction booklets dated 1892 and 1 instruction booklet for "The Mannheim Slide Rule".
Collection
Barry Flynn Essex Company Collection
Creator
Keuffel & Esser Company of New York
Rights
The Lawrence History Center holds this item but may not have full legal rights over it. For more information please contact the Center.