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Eccentricity of the Sextant by Frederic Furbish, 1893

Eccentricity of the Sextant by Frederic Furbish, 1893, Page 29

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22 be graduated so as to give it directly. Figure 3 and 4 illustrate instruments requiring the observer to look in two directions. Fig. 5 is a very sensible modification of Figure 4. In this form (Figure 5) the sun's rays throw the shadow of the upper end of the bar B on the center line of the vane A. The eye placed at the lower end of the bar B sees the center of vane A in line with the horizon. Substitute a mirror for vane A and we have a simple form of instrument and I would earnestly recommend a consideration of it by those who may someday be
 
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