32 
Mints to TitAvEtiEM 
the intersection of the hairs in the telescope, accurately, on some Vhil- 
defined distant object, take the reading of the vertical circle, unclamp 
the instrument, turn it through 180 °, reverse the telescope, again place 
the bubble in the middle of its run by the clip-screws, and cover 
Transit 'theodolite with level on Vernier Arms . 
