NIPHER — 4'^'' ANN. REP. MAGNETIC SURVEY OF MISSOURI. 473 



s\n-^a 19-83130 



ia 55° 26' sin 9.91569 



Sun's azimuth N 110° 56' - E. 



S 69 04 -oE. 



Hor. circle, Sun reads 82 46 .^ 



South reads 151 50 .4 



Mean reading of South 



Lat. 37° 55' a. c. cos o. - 



Decl iS 34 .,; 



Z. D 47 12.7 a. c. sin o. 



2 S 103 42 .3 



S. == 51 51 -2 COS 9.79077 



Decl 18 34 .6 



S. — dec. ^^ 16 .6 sin 9.73932 



sin 21 a 19-76740 



5« 49° 54' -7 sin 9-88370 



Sun's azimuth N 99° 49' . 4 W. 



S 80 10 .6 W. 



Hor. circle, Sun reads 231 54 .j 

 South reads 151 43-6 



1:1° at' 

 1^1 47 -0 



Mark reads 180 00 .7 



Azimuth of mark S. 28 13 .7W. 



Meridian Determinations by method of equal altitudes of the Sun. 



Station. 



Clayton 



Warsaw . 



Sweet Springs 

 McCredie 



Cor. 



+ I'.2 

 + 2.9 

 + 4.1 

 + 4.8 



South reads! Mark reads 



Azim. mark. 



264° 31'. I 180° 01 '.4 

 113 49 .6 I 180 00 .1 

 220 56 .4 I 180 01 .5 

 255 19 .5 ! 180 01 .1 



I 



S. 84° 29.7 E. 

 S. 66 10.5 W. 

 S. 40 54.9 E. 

 S. 75 18.4 E. 



In the table t is half the sidereal interval between the a.m. 

 and P.M. observations, A and A' are the readings of the horizon- 

 tal circle, and e is the probable error of the mean (uncorrected) 

 reading of south, treating \{A-^A'^ as constant, dd is the 

 increase in solar declination (in seconds) during^the time 2/. The 

 correction to be applied to 2 {^A-\-A') is given in the succeeding 

 column. 



