Comparisons of Magnetic Standards, 1915-21 



447 



Table 13B. Results of Horizontal-Intensity Comparisons at the Pilar Observatory, 1917. 



Series 



Date 



1917 

 Mar. 19 

 19 

 20 

 20 

 21 

 21 



Local mean time 



From 



h m 

 9 03 



13 53 

 9 05 



14 20 

 9 01 



14 04 



To 



h m 

 11 00 



15 33 

 11 18 



16 19 

 11 29 

 15 59 



Hor. int. obtained 1 



I. M. S. 



y 

 25478 

 480 

 489 

 486 

 471 

 460 



Pilar 



I. M. S.- 



Pilar 



y 

 25488 

 492 

 506 

 498 

 480 

 478 



Mean value of (I. M. S. Pilar). 



1917 



Nov. 9 



9 



9 



12 



12 



12 



Mean value of (I. M. S.- 

 Mean value of (I. M. S.- 



25478 

 497 

 472 

 460 

 437 

 393 



25478 

 50S 

 479 

 469 

 445 

 394 



-Pilar) 



-Pilar) from I and II. 



10 

 -12 

 17 

 -12 

 - 9 

 -18 



Remarks 



C. I. W. magnetometer No. 25 at 

 B; Pilar magnetometer No. 175 



, at D5. 



IC. I. W. magnetometer No. 25 at 

 D5; Pilar magnetometer No. 175 

 at B. 



-13. T or -0.00051H 





 -11 



- 7 



- 9 



- 8 



- 1 



C. I. W. magnetometer No. 25 at 

 D5 throughout; Pilar values are 

 from magnetograph data con- 

 trolled by observations with mag- 

 netometer No. 175 at Da. 



6.0 7 or -0.00024tf 



9.5 7 or -0.00037ff 



' The values on March 19, 20, 21, are all referred to Da; D5 = B+4.2y. 

 Table 13C. Results of Inclination Comparisons at the Pilar Observatory, 1911 



Series 



Local mean time 



Date 



1917 

 Mar. 26 

 26 

 27 

 27 

 27 

 27 



From 



h m 



10 01 



11 09 

 8 38 



10 24 



11 14 



12 06 



To 



h m 



10 55 



11 45 

 9 12 



10 56 



11 46 



12 38 



Inclination obtained 1 



I. M. S. 



-25 36.4 

 35.9 

 41.9 

 37.5 

 37.7 

 37.1 



Pilar 



I. M. S.- 

 Pilar 



-25 36.9 

 35.5 

 41.4 

 37.3 

 37.5 

 37.2 



Mean value of (I. M. S. Pilar). 



1917 

 Nov. 10 

 10 

 10 

 13 

 13 

 13 



Mean value of (I. M. S. Pilar). . 



-25 38.5 

 35.8 

 35.2 

 36.8 

 37.0 

 37.1 



-25 38.3 

 35.7 

 35.2 

 37.0 

 36.4 

 36.8 



Mean value of (I. M. S. Pilar) from I and II. 



+0. 

 -0 

 -0 

 -0 

 -0 

 +0 



-0.12 



-0.2 

 -0.1 

 0.0 

 +0.2 

 -0.6 

 -0.3 



-0.18 



-0.1 



Remarks 



C. I. W. inductor No. 25 at B; 

 Pilar inductor No. 3 at Di. 



C. I. W. inductor No. 25 at Di; 

 Pilar inductor No. 3 at B. 



C. I. W. inductor No. 25 at D4 

 throughout; Pilar values are de- 

 duced from magnetograph data 

 for horizontal and vertical in- 

 tensity controlled by observa- 

 tions with inductor No. 3 at Di 

 and magnetometer No. 175atZ>5. 



The values on March 26 and 27 are all referred to Di; D4 = S+0'.5. 



SUMMARY. 



Table 13D summarizes the chief results as already published in Volume 11 and 

 as given above. 



" See Res. Dep. Terr. Mag., Vol. II, pp. 245-247. 



