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ESTABLISHING DIRECTIONS by Transit
Figure  13-10.-Setting  the  vernier  at  zero-zero.

Engineering Aid 3 - Beginning Structural engineering guide book
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4.  You  should  always  maintain  contact between  the  leveling  screw  shoes  and  the  foot plate. 5.  You  should  not  disturb  the  setup  of  the instrument until you are certain that all observa- tions  at  that  point  are  completed  and  roughly checked.  You  should  move  the  instrument  from that setup only after checking with the party chief. 6.  Before  the  transit  is  moved  or  taken  up, you  should  center  the  instrument  on  the  foot plate, roughly equalize the height of the leveling screws,   clamp   the   upper   motion   (the   lower motion may be tightened lightly), and point the Measuring  Horizontal  Angles The  transit  contains  a  graduated  horizontal circle,  referred  to  as  the  horizontal  limb.  The horizontal limb may be graduated clockwise from 0°  through  360°,  as  shown  in  figure  13-9,  view A,  or  clockwise  from  0°  through  360°  and  also in quadrants, as shown in figure 13-9, view B; or both   clockwise   and   counterclockwise   from   0° through  360°,  as  shown  in  figure  13-9,  view  C. The  horizontal  limb  can  be  clamped  to  stay fast  when  the  telescope  is  rotated  (called  clamping the  lower  motion),  or  it  can  be  released  for telescope vertically upward and also lightly tighten rotating   by   hand   (called   releasing   the the  vertical  motion  clamp. motion). lower Figure  13-9.-Three  types  of  horizontal  limb  graduations. 13-9







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