Radial Square Root Planimeter

Kent / Amsler Radial Square Root Planimeter
Marking: Geo. Kent Ltd. / J. Amsler
Serial Number: -
Year: ca. 1930
Size: 19.5 x 16.5 x 4.5 cm

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References

[1]

George Kent Ltd.

Planimeter. Patent Nr. DE 628910. Reichspatentamt (1930).

[2]

Horace Edward Dall

Planimeter. Patent No. US 1867441. United States Patent Office (1932).