an alidade

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diopter
alidade
a surveying instrument used on a horizontal surface for basic mapping of a limited area (see: )
Alidade
surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
Alidade
Instrument, or part of an instrument , for determining direction , either horizontal or vertical In its simplest form, a peepsight or telescope mounted on a straightedge and used for plotting directions graphically In such instruments as transits and theodolites, the alidade is the part containing the telescope and its attachments
Alidade
In plane tabling, a straight edge having a telescopic sight or other means of sighting parallel to it
Alidade
1 A sighting device used to locate points in the field from which the survey drawing is plotted 2 The index of an astrolabe, quadrant or other graduated instrument, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument
Alidade
A stationary instrument, mounted on a stand, that measures the angle subtended at the stand by the horizon and an object in space The clinometer is a portable form of alidade frequently used with a ceiling projector to determine the height of clouds An alidade usually measures the elevation angle only; a theodolite measures azimuth as well
Alidade
A rule equipped with simple or telescopic sites and used for determination of direction (as part of an astrolabe)
Alidade
That part of a surveying instrument which consists of a sighting device and index, with accessories for reading and recording data A telescopic alidade is part of a theodolite or surveyor's transit, and when mounted on a straightedge, in conjunction with a plane-table, is used in topographic surveying (See theodolite and transit)
Alidade
A surveying instrument which uses a telescope and sighting line to transfer angles and alignments to a drawing board
Alidade
Upper part of a transit or a telescopic instrument used to take bearings
Alidade
An optical surveying instrument used along side a plane-table and stadia-rod to produce a detailed small-scale topographical map
Alidade
surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
alidade
a sighting device used for measuring angles
alidade
The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
alidade
{i} tool used in topographic surveying; indicator on a plane table
an alidade
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