Quantcast Timepieces - 14221_160

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Time and Date for Ships at Sea - 14221_159
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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Chronometer Error - 14221_161
Timepieces Introduction The  quartz  chronometer  is  the  main  source  for  keeping  shipboard  time (fig.  5-5).  A  chronometer  is  like  any  watch  except  that  it  keeps  time  to  a higher  degree  of  accuracy.  For  detailed  information  on  the  components and  upkeep  of  shipboard  chronometers,  refer  to  NSTM,  chapter 252. Error and Rate Even  a  chronometer  cannot  keep  exact  time  indefinitely.  Sooner  or  later the  chronometer  time  gradually  begins  to  draw  away  from  GMT  (UTC). The  difference  between  chronometer  time  and  GMT,  at  any  instant,  is called  chronometer  error.  Error  direction  is  identified  with  a  sign  or letter (+ or F = Fast) or (- or S = Slow) to indicate that the chronometer is either fast or slow in relation to the correct GMT. Chronometer  rate,  on  the  other  hand,  is  the  amount  the  instrument  gains or loses in a specified time. Figure  5-5.  Quartz  chronometer. 5-14

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