Optical balance level, after a type used in the 17th Century, British, 1700-1799
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, zinc alloy), glass, iron, lead (metal), mahogany (wood), steel (metal), wood (unidentified) and wood veneer
- furnishing and equipment
- measuring device - instrument
- Court, Thomas Henry
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