CoMP.vnisoNS OF Magnetic St.^ndards, 1905-14 



215 



intensity', +0.00006//; the tabulated values are the observed ones by W. E. W. Jackson, 

 with these corrections applied. Stations were not exchanged. 



In 1910 a fifth series (No. V) of comparisons was made by the Agincourt Observatory 

 between magnetometers Elliott No. 98 and C. I. W. No. 15, constructed and standardized 

 for the Meteorological Service of Canada by the Department of Terrestrial Magnetism. 

 The corrections of No. 15 on the C. I. W. standards, as resulting from the observations at 

 Washington in February and March 1910 were: for declination, +0'.l, and for horizontal 

 intensity, +0.00035//; the tabulated quantities are the observed values byW.E. W.Jackson, 

 with these corrections applied. No. 98 was mounted on Observatory Pier C, and No. 15 

 on Pier B; stations were not exchanged. 



T.\Bi,E 1 B. Results of Comparisnns by the Meteorological Sendee of Canada at the Agincourt Observaiory, 1909-1910. 



Series 



IV 



Date 



1909 



Oct. 29 



29 



Nov. 2 



2 



2 



2 



3 



3 



Mean 



75th 



meridian 



time 



h m 

 12 51 

 15 13 

 10 29 



12 21 



13 49 

 15 23 

 15 11 

 15 21 



Declination obtained 



C. I. W. 



Agincourt 

 (declinom- 

 eter) 



C.I.W. 



Agin- 

 court 

 (declin- 

 ometer) 



08.9 

 07.0 

 00.4 

 05.0 

 07.8 

 05.9 

 06.2 

 06.0 



-6 06.0 

 6 06.0 



5 58.0 



6 04.0 

 05.9 

 04.5 

 04.5 

 04.3 



Mean 



-6 08.1 

 07.3 

 05.5 

 04.2 

 17.8 

 19.0 

 06.8 

 09.0 

 14.0 

 13.2 

 19.3 

 17.8 

 13.4 



-2.9 

 -1.0 

 -2.4 

 -1.0 

 -1.9 

 -1.4 

 -1.7 

 -1.7 



-1.7 



0.0 

 -0.2 

 -2.1 

 -0.5 

 -0.6 

 -0.9 

 -1.3 

 -1.3 

 -2.0 

 -0.8 

 -0.7 

 -0.9 

 -0.7 



Mean 0.9 



Date 



1909 

 Oct. 29 

 Nov. 2 

 2 



Mean 



75th 



meridian 



time 



1910 



Apr. 21 



Sept. 28 



29 



Oct. 19 



19 



h m 

 14 10 

 11 29 

 14 36 



Horizontal 

 intensity 

 obtained 



C.I.W. 



7 

 16294 



248 

 270 



Agin- 

 court 

 (EU.98) 



C.I.W. - 



I Agin- 

 court 

 (Ell. 98) 



7 

 16293 



268 

 298 



Mean 



13 54 

 16 01 

 11 50 

 11 42 



14 14 



16268 

 252 

 184 

 202 



218 



7 



+ 1 

 -20 



-28 



-15.7 



16282 -14 



268 i -16 



197 I -13 



213 -11 



231 -13 



Mean 13.4 



Summarizing the results obtained up to the end of 1910: 



Table IC. C. I. W. Agincourt (Declinomeler; Elliott No. 98 uncorrected). 



The results in Table 1 C show a very satisfactory agreement as far as the horizontal 

 intensity is concerned, especially when it is remembered that different standardizing 

 magnetometers were employed in each case. The results in declination are not so good. 



