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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 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 spirit level [′spir·ət ‚lev·əl] (civil engineering) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 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. 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. |
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