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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 70

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     The subject "Eccentricity of the Sextant" may be divided into the following heads which will be taken up in order.-
     (1) Definition
     (2) Various methods employed in finding the eccentricity
     (3) Theory of the method employed.
     (4) Practical determination.
          (a) Observations.
          (b) Reduction to the meridian.
          (c) Formation of normal equations.
          (d) Reduction " " " [ditto for of normal equations.]
          (e) Formation of correction table.
(1) The eccentricity of a sextant is the distance between the center of the graduated arc and the center of rotation of the index arm.
     This eccentricity affects every angle measured with the sextant to a greater or less extent. As the arc is limited to 120° and only read by a single Vernier

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[page][illegible][/page] The subject "Eccentricity of the Sextant" may be divided into the following heads which will be taken up in order.- (1) Definition (2) Various methods employed in finding the eccentricity (3) Theory of the method employed. (4) Practical determination. (a) Observations. (b) Reduction to the meridian. (c) Formation of normal equations. (d) Reduction " " " [ditto for of normal equations.] (e) Formation of correction table. (1) The eccentricity of a sextant is the distance between the center of the graduated arc and the center of rotation of the index arm. This eccentricity affects every angle measured with the sextant to a greater or less extent. As the arc is limited to 120° and only read by a single Vernier