A spirit level, bubble level or simply a level is an instrument designed to indicate whether a surface is horizontal (level) or vertical (plumb). Different types of spirit levels may be used by carpenters, stonemasons, bricklayers, other building trades workers, surveyors, millwrights and other metalworkers, and in some photographic or videographi...
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http://en.wikipedia.org/wiki/Spirit_level
(from the article `surveying`) In spirit leveling the surveyor has for centuries used a surveying level, which consists of a horizontal telescope fitted with cross hairs, rotating ... The spirit, or bubble, level, a sealed glass tube containing alcohol and an air bubble, was invented in 1661. It was first used on telescopes and ... [...
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http://www.britannica.com/eb/a-z/s/142
A tool used to determine both how level a horizontal surface is and how plumb a vertical surface is. Most spirit levels are made of tough, lightweight metals such as magnesium or aluminum. The spirit level has two or three slightly curved glass tubes or vials, filled with ethyl alcohol (used because...
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http://www.daviddarling.info/encyclopedia/S/AE_spirit_level.html
A tool used to establish true vertical and horizontal lines by looking at a bubble in spirit filled vials.
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https://www.diydata.com/general_building/building_glossary.php
A tool for testing if a surface is level (or vertical) using a glass tube containing an air bubble. Invented by Jean Thevenot in 1666.
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https://www.encyclo.co.uk/local/20687
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