Spirit level
A spirit level comprises a planar base for resting, in use, on a surface whose level is to be determined, and levelling means comprising a vial filled with sufficient liquid that an air bubble is formed within the vial. The spirit level comprises indicia relative to which the bubble moves as the ori...
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| Format | Patent |
| Language | English |
| Published |
12.07.2011
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| Online Access | Get full text |
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| Summary: | A spirit level comprises a planar base for resting, in use, on a surface whose level is to be determined, and levelling means comprising a vial filled with sufficient liquid that an air bubble is formed within the vial. The spirit level comprises indicia relative to which the bubble moves as the orientation of the spirit level is altered so as to indicate the orientation of the spirit level. Optical means is provided on the spirit level to provide an image indicative of the position of the bubble relative to the indicia. |
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