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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 63

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correction at the beginning of the set; then measure 20 angles; another series for index correction; 20 angles and a final index set Sample sets of star observations for index correction are appended:-- On arc. | Off arc. 45" | 60" 50" | 55" 50" | 60" 55" | 60" 50" | 60" 45" | 50" 45" | 60" 50" | 55" 55" | 60" 55" | 50" ------- | ------- 10 | 500" | 10 | 570" ------- | ------- mean=50"| mean=57" a= - 50" | a'= 57" I= ((57" - 50")/2) = 3.5" A more accurate determination of index error can be made by observations on the sun.
 
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