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 ?
All are backed by a lifetime warranty, and all have an extremely unusual feature that I really admire: an internal bubble level at the bottom of the field of view that tells you whether you've mounted the scope 100 percent straight and, more important for long-range shooting, tells you if you're canting the rifle.
Tilt sensor: This device is an electronic version of a carpenter's bubble level, a horizontal tube with a bubble of air inside marked with a center line.
They include an "Assessment for Disabled Access Form," available through your state's ADA compliance office (or call ADA Technical Assistance at [800] USA-ABLE); a tape measure (we find that an 8-foot tape is the most useful); door pressure gauges; and either a bubble level specifically designed to measure ADA compliant slopes or an angle finder.
Your post must be perfectly vertical, and you can check this with a carpenter's bubble level.
Both units feature six-digit LCD displays and out-of-range indicators, data-logging output, spindle control, speed control with eight rpm settings, bubble level and height adjustment.
In fact, the only non-metal parts you'll find on the compact unit are the bubble level and the fiber optics.
As for the overall markets, Grantham says that as of writing the quarterly letter, "the threshold for a bubble level for the U.
It comes with a bubble level and a pushbutton three-position light.
Leveling Adjustment From +10A To -5A And Integral Bubble Level Standard.
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.