Illuminated spirit level

Claim 1

An illuminated spirit level comprising a. a rectangular body with two sets of parallel workpiece engaging surfaces which are perpendicular, b. a plurality of spaced openings along said body having spirit level containers mounted therein, c. a light source positioned in each of said openings for illuminating said spirit level containers when actuated, d. gravity switch means having a circular-shaped enclosed chamber mounted in said body and containing a freely movable ball of conducting material, said chamber having a plurality of pairs of conducting members forming normally open switch contacts, said pairs of switch contacts being positioned in said circular chamber at substantially 90* intervals and being generally perpendicular to at least one set of workpiece engaging surfaces, said ball adapted to close any given pair of switch contacts depending on the position of said body, e. a source of potential mounted in said body, f. circuit means interconnecting said source of potential, said light sources and said switch contacts such that said light sources are selectively illuminated when said ball engages a pair of said switch contacts depending on the position of said body.