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The Marine Sextant - 14220_228
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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The  Marine  Sextant,  Continued - 14220_230
The Marine Sextant, Continued Parts and Functions These  are  the  parts  and  functions  of  the  marine  sextant: Part Arc scale Indicates the number of degrees of an angle. Index arm Micrometer  drum Vernier scale Index  mirror Horizon  glass Telescope Filters Release levers Description  of  Function Pivots at one end to allow the attached index mirror to reflect an object onto the horizon glass and swings along the arc scale on the other end to indicate what the  angle  measures. Rotates  to  make  fine  adjustments  when  measuring angles and indicates minutes of a degree of angle. It is attached to the lower end of the index arm. One complete rotation moves the index arm 1° along the arc scale. The drum has 60 graduations, each representing 1' of arc. Indicates tenths of a degree of angle. It is attached on the index arm adjacent to the micrometer drum and has 10  graduations,  each  representing  0.1'  of  arc. Reflects  objects  onto  the  horizon  glass. Allows the observer to view one object directly on one side while observing a second object reflected next to it. The half of the horizon glass next to the frame is silvered to make that portion of the glass a mirror; the other half is clear glass. Directs the line of sight of the observer to the horizon glass  and  magnifies  the  objects  observed. Protects the observer’s eyes when viewing the Sun. Disengages the index arm from the arc scale to allow the index arm to move freely. 8-25

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