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drop ball |
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drop ball [′dräp ‚bȯl]
(engineering) A ball, weighing 3000-4000 pounds (1400-1800 kilograms), dropped from a crane through about 20-33 feet (6-10 meters) onto oversize quarry stones left after blasting; this method is used to avoid secondary blasting. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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