Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Holland Circle - click to enlarge

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Holland Circle

Catalogue number:
PH*317347

Inscriptions:
"JACOB SECOES" and "ANNO 1622"

Dimensions:
9.375 inches diameter

Discussion:
The outer circle of this instrument is graduated every 30 minutes, and has additional scales for tangents, sines, and secants. The small compass in the center has a fleur-de-lis at north, and an offset line probably indicating magnetic variation.

Further Information:

Holland Circle

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