Quantcast Plotting Instruments - 14221_217

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Plan of Intended Movement (PIM) - 14221_216
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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Plotting  lstruments,  Continued - 14221_218
Plotting Instruments Basics Let’s  put  together  what  we’ve  learned  about  the  DR  plot,  the  tools  of  the trade,  and  the  techniques  the  Quartermaster  uses. Tools  used  to  project  lines,  scribe  arcs,  measure  angles  and  distances, and  do  a  host  of  other  jobs  are  just  some  of  the  hand  tools  you  will  use as  a  Quartermaster.  Items  such  as  pencils,  parallel  rulers,  compasses, and  dividers  are  a  MUST  on  any  bridge  or  in  any  chart  room. Tools of the Trade Pencils:  Primary  among  these  tools  is  the  pencil  you  use.  There  are several  grades  or  hardness  of  lead.  The  softer  grades,  such  as  the  No.  2, are  ideal  for  plotting  positions  on  the  chart  and  for  other  general  uses around  the  bridge.  No.  3  pencils  are  considerably  harder,  will  hold  a point  longer,  and  will  usually  sharpen  better  for  use  in  drawing  fine lines  as  will  be  required  when  the  QM  wants  to  plot  stars,  draw  course lines,  or  do  other  chart  work  that  requires  the  use  of  better  than  average lines  to  show  the  condition  to  be  depicted.  Under  most  conditions,  only the  Nos.  2  and  3  grade  pencils  will  be  necessary. Parallel  Rulers:  Parallel  rulers  are  instruments  used  for  moving  lines parallel  to  themselves,  determining  direction  from  the  compass  rose,  and laying  out  course  lines. These  are,  of  course,  only  a  few  of  the  uses  of parallel  rulers. Some  of  the  other  uses  include  drawing  straight  lines, advancing  lines  of  position,  checking  ranges,  plotting  fixes,  and measuring  direction  from  one  given  point  to  another.  There  are  other devices  available  which  are  easier  to  use  and  will  do  the  same  job  as parallel  rulers. The  Weems  parallel  plotter  (fig.  8-7)  is  the  most  widely used  variation  of  the  parallel  ruler. Figure  8-7.  A  parallel  rule  (top)  and  a  Weems  parallel  plotter. 8-13

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