We use spirit level surveys to measure elevation change.
Utilize plumb bob, gauge line and spirit level to obtain straight courses.
Verifies vertical alignment of posts with plumb bob or spirit level.
Included is a spirit level, adjustable leveling screws and a desiccator which can be readily inspected.
Side-to-side level may be adjusted by means of the built-in spirit level.
Check that the apparatus is in a true level condition with a spirit level placed on the top of the kettle.
If only vertical position were sought, the spirit level has been the instrument of choice.
Instruments were checked frequently with a spirit level to insure that they remained level.
British Dictionary definitions for spirit level
a device for setting horizontal surfaces, consisting of an accurate block of material in which a sealed slightly curved tube partially filled with liquid is set so that the air bubble rests between two marks on the tube when the block is horizontal