Quantcast Plotting  lstruments,  Continued - 14220_218

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Plotting Instruments - 14220_217
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Plotting Techniques - 14220_219
Plotting  lstruments,  Continued Tools of the Compasses:  Compasses  are  not  to  be  confused  with  the  direction Trade,  continued   finding  compass  such  as  the  magnetic  or  gyrocompass.  The  compasses referred  to  here  are  tools  that  are  very  similar  in  appearance  to  the divider.  The  distinction  between  dividers  and  compasses  is  that  while both  divider  legs  are  fitted  with  needles,  the  compass  legs  are  fitted  with a  needle  on  one  leg  and  a  marking  lead  or  pencil  on  the  other. Compasses  are  useful  for scribing  circles  and  arcs  such as  radar  ranges  or  perhaps showing  the  limits  of  a  light’s visibility.   Dividers   and compasses  (fig.  8-8)  will  give best  results  when  the adjustment  screw  at  the  hinged end  is  kept  tight  enough  to permit  ready  use  but  prevent slippage.   The   needle   points should  be  sharp,  extended  to the  same  length,  and  locked securely  using  the  locking screw  provided. Figure  8-8.  Compass  and  dividers. A  variation  of  the  compass,  called  a  beam  compass,  is  used  when  a greater  spread  is  required  than  an  ordinary  compass  can  accommodate. The  beam  compass  is  simply  a  long  bar  with  a  needle  point  at  one  end and  a  marking  lead  or  pencil  at  the  other  end;  both  are  adjustable.  This compass  is  very  useful  when  using  large-scale  charts  such  as  harbor charts. Dividers:  A  pair  of  dividers  is  an  instrument  or  tool  used  to  measure the  difference  between  two  given  points.  It  consists  of  two  small  pieces of  metal,  plastic,  or  wood,  hinged  at  one  end,  allowing  the  opposite  ends to  be  separated.  There  are  needles  or  points  placed  in  the  ends  of  both legs  which  enable  the  user  to  obtain  a  more  accurate  measurement  and allow  the  tool  to  be  swung  from  one  length  to  another  without  slipping. There  are  many  sizes  of  dividers,  but  the  5-  and  6-inch  sizes  have  been found  to  be  the  most  popular  and  useful.  Larger  dividers  are  handy  at times,  but  can  be  clumsy  to  use. 8-14

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