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surveying staffs: see surveying staff.
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surveyor's cross: instrument for establishing right-angled lines of sight, by means either of open sights set at the ends of an equal-arm cross or slits in a cylinder.
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surveyor's line: a long string or rope used to measure distances for surveying.
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surveyor's square: another name for a surveyor's cross.
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theodolite: surveying instrument for measuring horizontal angles, and perhaps vertical angles, see article on the theodolite.
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