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alidade

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alidade [′al·ə‚dād]
(engineering)
An instrument for topographic surveying and mapping by the plane-table method.
Any sighting device employed for angular measurement.
alidade
The part of a surveying instrument which consists of a sighting device, with index, and reading or recording accessories.
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The mater can be suspended from a hook and its back is calibrated so that, with the aid of a sighting bar called the alidade, the altitudes of the Sun or stars can be observed.
The Astrolabe by Glass, Ian / Monthly Notes of the Astronomical Society of Southern Africa
When I see smoke, I line it up on the alidade table and get a line of sight on it.
On the job by Telegram & Gazette (Worcester, MA)
Plane table and alidade were used to map paleosols and topography along six dune faces (Figure 4).
The history of dune growth and migration along the Southeastern shore ... by Hansen, Edward C.; Arbogast, Alan F.; Yurk, Brian / Michigan Academician
 
 
 
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