Optical balance level made in the 18th century or later, after a type used in the 17th (see note).
Levelling is the method used by surveyors to determine the relative heights of different points on the earth's surface, but originally referred to the simple procedure of determining the horizontal. This crude instrument has a lead tube hanging from a fixed thread inside a protective case, with a slit at one end and a cross-hair at the other. The device would have been so easily disturbed that its use would have been extremely limited.
- Object Number:
- brass (copper, glass, iron, lead (metal), mahogany (wood), steel (metal), wood (unidentified), wood veneer, zinc alloy)
- optical balance level
- Court, Thomas Henry
- Permanent collection
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