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Page Title: The Marine Sextant, Continued
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The Marine Sextant, Continued Reading  Positive An example of what the scales would look like if you had a  positive Index  Error index  error  is  shown  in  figure  8-17.  Notice  that  the  index  mark  is  to  the left  of  the  0  on  the  arc  scale  and  that  the  0  on  the  vernier  scale  is  above the  0  on  the  micrometer  drum,  indicating  a  positive  error.  The micrometer  and  vernier  scale  lineup  directly  at  the  0.4'  line  on  the vernier  scale,  indicating  an  index  error  of  +0.4'.  This  would  be subtracted  from  any  angles  taken  with  this  sextant  to  obtain  an  accurate angle. Figure  8-17.  Positive  index  error. 8-31

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