ABBREVIATIONS AND SIGNS. 



a, b, c, azimuth, level, and collimation corrections. 

 A, B, C, = azimuth, level, and collimation factors. 



T zz observed time reduced to the mean of wires and corrected for rate. 

 T" zz observed time corrected for instrumental errors. 

 AR. zz apparent right ascension of star. 



^/o T zz resulting error of the chronometer after the mean of the wires is cor- 

 rected for rate and level. 

 -<4 T zz adopted mean error of chronometer. 

 dT = JT J T. 

 ^ T zz error of the chronometer. 



v zz difference between mean final correction of chronometer and J T. 



