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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 35

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By Geometry BCD=CDE+BED BED=BCD-CDE But- BCD=2ACDonce CDE=2CDF, BED=2ACD-2CDF= 2(ACD-CDF). By Geometry ACD=CDF+AFD. AFD=ACD-CDF BED=2AFD= twice the angle between the reflecting surfaces C and D The application of this principle to the [?] is shown very well in the following diagram and explanation. Suppose we [with] to observe the angular distances between the plain B and C, B being the [?] and C the familiar. Point the [?] at C and [?] the [?} so that its place [?] in the plane of the [?] As they are practically at the distance the says C D and
 
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