8-19. 8-20. 8-21. 8-22. The  progressive  method  of horizontal location is performed in what manner? 1. Establishing  several  known points  from  one  setup 2. Establishing an unknown point as a known point by alignment and distance for use as the next  point 3. Establishing an unknown point as a known point from several previously  known  points 4. Using an existing traverse to plot all points for the topographic  map Which of the following advantages apply to plane-table surveying? 1. Errors in measurements are easily  checked 2. It reduces the possibility of overlooking important data 3. It combines data collection and the  drafting  operation 4. Each of the above In comparison with the transit-stadia  method,  how  many points  are  used  in  the  plane-table method for the same degree of accuracy? 1. More  points 2. Less  points 3. The same amount Which  of  the  following disadvantages  apply  to  the plane-table   method? 1. Unsuitable  for  wooded  areas 2. Adverse weather conditions 3. More difficult to transport the equipment 4. All of the above 8-23. What method is recommended to keep the  blade  aligned  with  the  occupied point? 1. Use two triangles to draw a parallel  line  with  the telescope   straightedge 2. Use a pin as a pivot point 3. Use two triangles to pivot around a pin 4. Clamp the blade in place 8-24. What is the purpose of using buff or green detail paper? 1. Provides  a  good  background 2. Reduces  the  glare 3. Absorbs the ink to reduce runs 4. Reproduces  well 8-25. In  maintaining  the  plane-table drawing,  you  should  follow  which  of the  following  drafting  practices? 1. Clean the paper at the end of the day to remove graphite 2. Use a soft lead pencil to prevent  smudging 3. Lift the blade when moving it to  prevent  smudging 4. All of the above 8-26. A possible source of error in your plane-table  work  is 1. the sights are too short for accurate  sketching 2. too few points for good sketching 3. the use of aerial photographs 4. the use of the same points to locate  details  and  contours 8-27. You should ensure which of the following  conditions  are  met  to keep  mistakes  and  errors  in plane-table work to a minimum? 1. Table is level 2. Orientation  is  maintained 3. Both 2 and 3 above 4. Perform  traverse  and  detailing simultaneously 54