Radial Planimeter

Amsler Radial Planimeter
Marking: Foxboro / Durand-Amsler
Serial Number: 58503
Year: ca. 1917
Size: 24 x 7.5 x 5 cm

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References

[1]

Wiliam F. Durand

Planimeter. Patent No. US 927338. United States Patent Office (1909).
[2]

Gebrüder Amsler

Katalog der Präzisionsinstrumente und Apparate. Schaffhausen Schweiz (1925).