Quantcast How  to  Use  the  Telescopic  Alidade - 14221_85

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Page Title: How to Use the Telescopic Alidade
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Telescopic  Alidade - 14221_84
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Determining  Gyro  Error  by  Terrestial  Range - 14221_86
How  to  Use  the  Telescopic  Alidade View  Through the Alidade The  optical  system  simultaneously  projects  the  image  of  the  compass card,  together  with  a  view  of  the  spirit  level,  onto  the  optical  view  of  the telescope.  By  this  means,  both  the  object  and  its  bearing  can  be  viewed at  the  same  time  through  the  alidade  eyepiece. Figure  2-20  illustrates  taking  a  visual  bearing  with  a  telescopic  alidade. In  this  example,  the  bearing  to  the  lighthouse  is  022°. Follow  these  steps  to  properly  take  a  bearing  with  a  telescopic  alidade. Step 1. Action Place the ring on top of the gyro repeater and twist locks into 2. Point the front lens of the alidade towards the object to be sighted. Tip: Sight along the handle to quickly find an object. 3. Look into the eyepiece and rotate the alidade right or left until the object is aligned with the crosshair. 4. Keep the alidade level by observing the spirit level in the top part of the view. 5. With the object lined up and level, read the bearing from the reflected compass card. Read the inside compass card for true bearings. Figure  2-20.  View  through  an  alidade. 2-31

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