Details and Image
|Date||Scale Length||Area of Use
|Polar||Amsler Type 4||Amsler||Switzerland||German silver||ca. 1890's||N/A||General area measurement
Notes: "This is an Amsler Type 4 planimeter that was sold through the London office of Crosby Steam Gage & Valve Co. The serial number is 18770, indicating it is fairly early."