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Jacob's staff

noun, plural Jacob's staves.
1.
Astronomy, cross-staff.
2.
Surveying. a pole providing a firm support for a compass or other instrument.
Origin
1540-1550
1540-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for jacobs staves

Jacob's staff

noun
1.
a medieval instrument for measuring heights and distances
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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