ToughBuilt Industries, Inc.
Leveling instrument with multiple sensitivities

Abstract:

A leveling instrument includes a generally elongate carrier defining a carrier axis. A first liquid-filled bubble vial is mounted on the carrier and defines a first vial axis and an internal generally barrel-shaped surface of revolution about the first vial axis formed by a curve having a predetermined curvature to exhibit a first sensitivity. A second liquid-filled bubble vial defines a second vial axis and has a generally barrel-shaped surface of revolution about the second vial axis and formed by a curve having a curvature less pronounced than the predetermined curvature of the first vial to exhibit a second sensitivity greater than the first sensitivity, the first and second vial axes being generally parallel to each other. If the vials are curved they are similarly oriented and have different curvatures to exhibit different sensitivities. A method of using the multi-vial leveling instrument is described.