TAKING THB SUN WITH THE SEXTANT. 



The instrument is held in the right hand, and levelled at the horizon; the 

 left hand manipulating the micrometer screw which adjusts the radial arm 

 »rr>ing the index mirror (at top of figure). The result is read on the Ver- 

 vT scale (arc at bottom of figure) with the aid of the magnifying glass. 



