Alidade E is a representation of a very interesting design by Johannes Hevelius. Hevelius was following in Tycho Brahe's footsteps and cataloging star positions with high accuracy.
alidade
See Also: theodolite
[surveying] A peep sight mounted on a straightedge and used to measure direction.
[surveying] The part of a theodolite containing the telescope and attachments.
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 stadia surveying, it is the height of the center of the telescope (horizontal axis) of the transit or telescopic alidade above the ground or station mark.
 See also: Object, Feature, Surveying, Navigation, Origin
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