#spirit_level__level indicator that establishes the horizontal when a bubble is centered in a tube of liquid
supertype: indicator a device for showing the operating condition of some system
subtype: mason's_level a level longer than a carpenter's level
part of: carpenter's_level__carpenter'slevel a straight bar of light metal with a spirit level in it
part of: surveyor's_level surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land
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