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Page Title: Bearing Circle and Azimuth Circle
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Bearing  Circle  and  Azimuth  Circle Components Figure  2-13.  Parts  of  a  bearing  circle. Figure  2-14.  Parts  of  an  azimuth circle. Figure  2-13  is  a  diagram  of  a bearing  circle  and  figure  2-14  is  a  diagram  of  an  azimuth  circle.  The table  below  lists  the  major  parts  and  functions  of  each  of  these  circles. Part Bearing A z i m u t h Function Circle Circle Ring Yes Yes Fits upon a 7 ½ inch gyro repeater. Sight Vanes Allow the observer to take bearings of objects by aligning the two vanes to the object. The near vane contains a peep sight while the far vane contains a Yes Yes vertical wire. The far vane is mounted on top of a housing that contains a reflective mirror inside enabling the observer to read the bearing from the reflected portion of the compass card. Reflector Vanes Allow the observer to observe azimuths of celestial bodies (stars and planets) at various altitudes by Yes Yes picking up their reflection in the black mirror. When the body is observed, its reflection appears behind the vertical wire in the far vane. Levels Yes Yes Indicate if the ring is level with the horizon. NOTE:  Bearings read when the ring is not level are inaccurate. Concave  Mirror Prism  Housing NO NO Yes Yes Reflects the Sun’s rays onto the prism housing on the other side of the ring when the observer is taking an azimuth of the Sun. Directs the beam of light from the concave mirror downward in a narrow beam onto the compass card enabling the observer to read the azimuth to the Sun. 2-24

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