A very much adjusted, machined aluminum plate turning smoothlyat about its hub and clipped on tripod remain in vertical plane.The plate proceeds onward metal ball and has number of holesplaced symmetrically in concentric circles of known diameter.Four pins conveying scale container can be embedded into the holesat any coveted position. Finish with even graduatedmirror scale, plumb line, leveling screw, two side pulleys and4 scale dish.

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