Alidad
01
a surveying instrument used with a plane table to sight distant objects, draw lines of sight, and measure angles
専門的
文法情報
例
The surveyor used an alidad to accurately measure the property boundaries.
02
the upper rotating part of a theodolite, including the telescope and its attachments
専門的
例
The geologist adjusted the alidad on the theodolite to take precise measurements of the rock formation.
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