330 



VOX ARX 



[chap. 16 



polar axis and set the hour angle and declination axis of an equatorially 

 mounted telescope well enough to bring the image of a bright celestial object 

 into the field of view in daylight or darkness. 



The equatorially mounted optical train used in these experiments is shown 

 in Fig. 5. It consisted of a Kern DKM-1 precision theodolite with its azimuth 



Fig 



5. Small theodolite mounted on the telescope tube of a larger theodolite, fixed to the 

 meridian gyro head. This arrangement permitted the upper theodolite to move as an 

 equatorial mounted telescope and its circles to read Right Ascension and Declination, 

 while the upper circle of the lower instrument gave the altitude of the celestial pole 

 or ship's latitude. The camera clamp mounted on the hour circle box of the upper 

 theodolite was used in making Figs. 9 and 10. 



circle set in accurate alignment with the former position of the objective lens of 

 a Kern DKM-2 theodolite. In this impromptu arrangement there are four 

 ace urately graduated circles : ( 1 ) the azimuth circle of the lower theodolite to 



