ANGULAR SURVEYING 



TRANSIT SURVEYING 



The engineers' or surveyors' transit is now used almost exclu- 

 sively in surveying. This instrument is primarily intended 

 for measuring angles in a horizontal plane, but some transits 



FIG. 1 



have also a vertical circle, or arc, for measuring angles in a ver- 

 tical plane. Fig. 1 shows a transit of this kind with a vertical 

 arc V and a level L on the telescope. 



