Vintage Mechanical Polar Planimeter Drafting & Measuring Tool Set with Original Case A vintage mechanical compensating polar planimeter precision measuring instrument used in drafting, engineering, surveying, and cartography to calculate the area Features & Details: Type: Mechanical Polar Planimeter / Map & Drafting Area Tool Model / Markings: No. D1804AM / Serial No. 18002 Components Included: Tracing arm with magnified glass lens, polar arm, weight disc, counter/dial assembly, and original lined storage case Material: Precision machined metal, glass lens, velvet-lined hardshell case Use Case: Antique engineering collectible, architectural display, drafting tool collector piece Condition: Good pre-owned vintage condition. Metal components show minimal wear with clean scales, clear glass lens, and working mechanical dials. The original storage case shows age-appropriate exterior shelf wear along the edges and latches, but interior velvet lining remains intact and vibrant.