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levelInstrument for finding horizontal level, or adjusting a surface to an even level, used in surveying, building construction, and archaeology. It has a glass tube of coloured liquid, in which a bubble is trapped, mounted in an elongated frame. When the tube is horizontal, the bubble moves to the centre. 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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The light waves have to enter the crystals along vertical surfaces and exit the ice crystals along horizontal surfaces. The main difference is that an expanded laser beam with optics illuminates a line across a horizontal surface. Unfamiliar parts littered every horizontal surface. |
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