Page:Tycho brahe.djvu/357

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SCIENTIFIC ACHIEVEMENTS.
327

(C), while the other observer pointed to the other star through a sight at the end of a movable radius. Both observers employed


Sextans Trigonicus.

the same object-sight, a small cylinder (A) at the centre of the arc and perpendicular to the plane of the sextant. As the observers when measuring very small distances would