• WordNet 3.6
    • n alidad surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
    • n alidad surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
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In literature:

The second lesson takes up the preparation of the stride scale on the alidade and the different kinds of maps, made in military sketching.
"Military Instructors Manual" by James P. Cole and Oliver Schoonmaker
An additional article of the sketcher's equipment is a holder for his pencils, alidade, eraser, knife, pins, etc.
"Manual of Military Training" by James A. Moss
All this required the establishment of an accurate baseline and a number of control points by means of alidade and stadia-rod measurements.
"The Cultural History of Marlborough, Virginia" by C. Malcolm Watkins