Patent ID: 6792685
Filing Date: 2004-09-21
Classification: G01C

Abstract:
A laser plumb, comprising:a base, a support, extending from said base; a rotatable mass pivotably mounted to said support, for rotation about a spin axis and pivotable to allow tilting of said spin axis relative to said support about a first tilt axis perpendicular to said spin axis; a weight mounted to said mass beneath said first tilt axis to align said spin axis under the influence of gravity a laser mounted to said weight, to emit a beam of light along a beam axis, said beam axis pivotable with said mass under the influence of gravity, so as to extend in a fixed direction relative to the direction of gravity when said weight is in equilibrium under the influence of gravity; a motor to spin said mass about said spin axis, so that the angular momentum attributable to said rotatable mass stabilizes said laser.