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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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Alexander's Lure is a 10-foot-tall, 280-pound ovoid, suspended by a chain and looking, says Scaled Composites Vice President Mike Melvill, like ``a big plumb bob. Use a plumb bob, to make sure it's an accurate perpendicular measurement. PHOTO A 1957 file photo shows a Lookout Mountain Studios cameraman photographing a mushroom cloud during Operation Plumb Bob. |
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