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Article History

level, device for establishing a horizontal plane. It consists of a small glass tube containing alcohol or similar liquid and an air bubble; the tube is sealed and fixed horizontally in a wooden or metallic block or frame with a smooth lower surface. The glass tube is slightly bowed, and adjustment to the horizontal is indicated by movement of the bubble. The device is on a level surface when the bubble is in the middle of the glass tube. The level’s sensitivity is proportional to the radius of the curvature of the glass.

This article was most recently revised and updated by Amy Tikkanen.