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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 56

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[page][?][/page] and time corrections. Professor Doolittle in his work on Practical Astronomy offers the following suggestion which will prove valuable to the student beginning sextant work;- "The beginner will sometimes find difficulty in bringing two images into the field together. A convenient way of accomplishing this is as follows:- Bring the index near the zero point and direct the telescope to the [sun?] (in this case) when two images will be seen; then bring the instrument down toward the mercury horizon, at the same time moving the arm so as to keep the reflected image in the field until the image reflected from the mercury is found, when both will be in the field together. A little practice will make the process very easy."
 
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