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Laser Rod - 14070_265
CHAPTER  13 MATERIALS TESTING - 14070_267

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 12-8.—Grading machine controlled by laser level and laser detector. and tunneling, the operator of the machine can stay on   the   proper   alignment   and   grade.   Figure   12-8 shows a laser level mounted on a tripod and a power grader  with  laser  detectors  mounted  on  each  end  of the blade. 5. The laser level shuts off when the laser beam deflects from horizontal. 6.  It  increases  the  number  of  rod  readings,  as each  rodman  can  set  elevations  without  waiting  for the  instrumentman,  thereby  increasing  the  area  of survey within a given time frame. QUESTIONS Q1. What   two   general   types   of   electronic   distance meters are in common use? Q2. Assume  that  you  have  used  an  EDM  to  measure the slope distance from points A to B and that you observed   the   vertical   angle   using   a   separate theodolite.  The  slope  distance  is  730.65  meters and  the  observed  vertical  angle  is 3°25´30´´.  The recorded  heights  above  the  ground  for  the  EDM, reflector,  theodolite,  and  target  are  1.75  meters, meters, 1.60 meters, and 1.70 meters, respectively. Calculate the horizontal distance. Q3. You  are  using  a  specially  designed  short-range EDM  mounted  on  an  optical-reading  repeating theodolite  to  locate  the  position  of  a  point.  To what   class   of   positioning   systems   does   your instrument belong? Q4. For  normal  leveling  operations,  in  what  mode should the laser detector on your laser rod be set? 12-8







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