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plumb bob |
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plumb bob [′pləm ‚bäb] (engineering) A weight suspended on a string to indicate the direction of the vertical. 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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More than 2,000 years ago the Mayans used plumb bobs and chalk lines in building carved columns so finely that a row of hundreds of these would disappear behind the first one. |
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