Holland circle

Building on this idea, Jan Dou designed an instrument with two pairs of fixed sights attached to a graduated circle, and another pair of sights attached to either end of a movable alidade. Dou published an account of this instrument in Dutch in 1612, and the form became popular with surveyors in the Netherlands. The name Holland Circle was coined in the 19th century. The Holland Circle is similar to but easily distinguishable from the common theodolite.

The Holland Circle of the Museon was made around 1800 in Amsterdam by Jan Marten Kleman.

The Holland Circle is currently in the depot of the Museon and can not be seen in the exhibition!

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