BASE LINE MEASUREMENT. 



47 



The following is an example taken from the records of measurement 

 in 1889 near Spearville, Kansas, together with the reduction of this base 

 for inclination, temperature, and elevation al ove sea level: 



Record of measurement ami reduction of Spearville base, Kansas. 

 [Section 1. Stations 0-10. October 16, 1889. Light rain falling. ] 



I Scciinil measurement, October 17, 1889.] 



Correction for inclination Spearville base, Kansas. 



sin 2 1'. 



Correction =z 



:e 2 X Distaii.o. 



