29.242Figure 11-7.-An engineer’s transit, exploded view.center of a circular plate and accurately fitted thesocket in the leveling head. The lower plate containsthe graduated horizontal circle on which the values ofhorizontal angles are read with the aid of twoverniers, A and B, set on the opposite sides of thecircle. A clamp controls the rotation of the lower plateand provides a means for locking it in place. A slow-motion tangent screw is used to rotate the lower platea small amount to relative to the leveling head. Therotation accomplished by the use of the lower clampand tangent screw is known as the LOWERMOTION.Upper Plate or Alidade AssemblyThe upper plate, alidade, or vernier assemblyconsists of a spindle attached plate to a11-15
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