Mechanical curve-measuring tool / opisometer
The device is a functional mechanical instrument with historical significance. Its all-metal construction and precise mechanism emphasize its technical sophistication. It is suitable as a collector’s item for enthusiasts of technology and cartography history and can also serve as a teaching tool to illustrate historical surveying techniques. Additionally, it has a decorative quality and can be effectively displayed in cabinets or themed exhibitions.
63,00 € Including VAT
The device is a mechanical curve-measuring tool, stamped with “Optiker Borberger,” likely located on Bahnhofstraße in Munich’s Isarauen district. The housing is made of solid metal, robust and precisely crafted, with a satin or nickel-plated finish. A metal ring serves as a handle for guidance and attachment.
The function of the instrument is to measure curved lines on maps, plans, and technical drawings. The scale allows readings in centimeters, millimeters, inches, miles, and more. Operation is performed by rolling the measuring wheel along the desired line.
The individual weight of the device is approximately 34 g, and around 45 g with the original packaging.
The condition is good: slight signs of use are visible, the scale is clearly legible, and the mechanism is functional. The set is complete with the original packaging and instructions.
| Weight | 0,045 kg |
|---|---|
| Dimensions | 1,7 × 4,3 × 1,7 cm |
| Manufacturer | Unknown (likely Germany, mid-20th century) |
| Style | Technically and historically significant, with collector’s value |
