spirit level

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spirit level,

tool for determining whether a surface is horizontal. It consists essentially of a slightly bent transparent tube that is held in a frame. The tube contains some alcohol, ether, or similar fluid but is not entirely filled, so that it also contains a small bubble. The position of the bubble within the tube indicates whether the instrument is horizontal. The spirit level used by carpenters and masons has two tubes at right angles to each other, so that the device registers a vertical as well as a horizontal position. The plumb line was used to determine vertical position from ancient times until the 19th cent. At that time the spirit level, which was invented in France during the 17th cent., came into general use and replaced the plumb line in some applications.

Spirit level

A leveling instrument used for testing the horizontal or vertical position of any structural member.

spirit level

[′spir·ət ‚lev·əl]
(civil engineering)

spirit level

A closed glass tube of circular cross section, usually set in a device or instrument; nearly filled with liquid, so that a bubble is formed, the centering of which is used to determine true horizontal or vertical directions; a level.

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
References in periodicals archive ?
The two-inch aperture with a glowing orange peep ring makes for quick target acquisition, and the second- and third-axis adjustable bubble level and offset mounting bracket making it compatible with any bow.
The large aperture housing holds a micro-adjustable bubble level, peep-alignment fibers situated around the aperture and extra-fine steel pins (1, 4 or 5) backed by extended fibers and a rheostat pin light.
The optical fibers are wrapped in a clear ring, the zero-gap metal pins appear quite tough, and the bubble level is adjustable for 3rd axis correction.
The round pin guard includes peep-alignment ring and bubble level.
019" fiber optics, a rheostat light for lowlight conditions, and an adjustable 3rd axis bubble level.
A misaligned bubble level can't give an accurate reading.
The 20-12SM is a curved bubble level with two window openings that show a 1:12 slope for new construction and a 1:20 slope for measuring any part of an accessible route that is to be considered a ramp.
019" pins, an adjustable 3rd - axis bubble level, and a reversible mounting bracket.
If your sight has 3rd-axis capabilities, use a carpenter's bubble level to first square the bow in your vise, then the sight head on the leveled bow.
Additional features include best in class, consistent distribution of irradiance and temperature, improved ergonomic specimen retaining clips/rings for easier sample handling, adjustable height caster and integrated bubble level and recirculation spray water option.
Included in the app is a plumb bob level, surface level, bubble level bar, ruler and protractor.
It comes with a bubble level and a pushbutton three-position light.