A-frame level
tool
Quick Summary
An A-frame level is a tool used to establish a horizontal plane. It consists of an A-shaped frame with a plumb line suspended from the vertex. When the feet of the A-frame rest on a surface, the surface is considered horizontal if the plumb line bisects the frame's crossbar. This type of level was used in Europe until the mid-19th century. A level, in general, is a device for establishing a horizontal plane, often using a glass tube with a liquid and an air bubble, where the bubble's position indicates if the surface is level.12
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