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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 48

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-ceding equations and we get: -- (1) [[n?]] = (d / (d - d')) d' = ((([[n?]] + 1)/[[n?]]) * d) (d - d') = ((1/[[n?]]) * d) d = 10' d-d' = 10" [[n?]] = (10' / 10") = 60 ([[n?]] + 1) = 61 d' = ((61 / 60) * d) As has been previously stated the graduations of both Vernier and arc are on silver. A small reading glass (see photograph) mounted on a movable arm pivoted on the index bar is used in reading the Vernier. This is rendered necessary by the exceeding smallness of the divisions which makes reading with the naked eye an impossibility.
 
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