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Surveyor's Cross
Signed 'ALESdro POLco VAZla'
circa 1600; Italian
Brass; 116 mm in height

This is a simple surveying instrument, used to establish angles of 90 and 45 degrees when either setting out a site or taking linear measurements. However, it has unusual features that make it a rare object. The egg shape to the top of the instrument is very rare, since a cylinder is the standard form and some later examples are octagonal. The survival of a wooden case shaped to match the egg is likewise extraordinary and exceptional.

Museum of the History of Science, Oxford
Inventory number 52076

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