Spirit level

Details Spirit level Spirit level

2011-07-12

2011-07-12

Fulton, Christopher W (Department: 2841)

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

C033S379000, C033S390000

Reexamination Certificate

active

07975393

ABSTRACT:
A spirit level (1) comprises a planar base (14) for resting, in use, on a surface whose level is to be determined, and levelling means (27) comprising a vial (41) filled with sufficient liquid that an air bubble (47) is formed within the vial (41). The spirit level (1) comprises indicia (43, 45) relative to which the bubble (47) moves as the orientation of the spirit level (1) is altered so as to indicate the orientation of the spirit level. Optical means (29) is provided on the spirit level (1) to provide an image indicative of the position of the bubble (47) relative to the indicia (43, 45).

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