Specimen Summaries of Constants 



29 



Constants of Dover Dip Circle No. 205. 

 Compass attachment: 



Correction of observed declination to Standard +5'.0 



(To be applied algebraically, counting east declination positive and west declination nega- 

 tive.) 

 Dip needle corrections at Washington (/ = 70. 6) : 



Needle No. 12 5 6 3 deflected 7 deflected 



Correction to Standard -0'.6 O'.O -0'.2 -I'.l +0'.4 -1'.5 



(These corrections may be diff^erent for other values of dip; they are to be applied algebra- 

 ically to observed dip, regarding northerly dip as positive.) 

 Total intensity constants: 



Values based on Standard and determined from four sets at Washington, D. C, April 11 to 15, 



1910. 

 Needle pair j and 4. 



Loaded dip needle No. 4 with weight 31 in 5 end; log Ci at 22.8 Cent, is: 9.63849 



Deflections No. 3 by No. 4, mean of No. 3 direct and reversed, log Cd at 



22.8 Cent, is: 9.51500 



Hence log C: 9.57674 



Needle pair y and 8. 



Loaded dip needle No. 8 with weight 31 in .S end ; log Ci at 22.8 Cent, is: 9.64314 



Deflections No. 7 by No. 8, mean of No.7 direct and reversed, log Cd at 



22.8 Cent, is: 9.50634 



Hence log C: 9-57474 



