440 



Special Reports 



1 It is assumed that any station-difference between piers jV and is negligible. 

 Table 10E. Results of Horizontal-Intensity Comparisons at the Kew Observatory, 1919. 



Date 



1919 

 April 2 



Local mean time 



From To 



h m 



11 41 



15 53 

 17 03 



10 OS 



12 03 



16 01 



h m 

 12 33 



16 36 



17 45 

 9 20 



10 50 

 12 44 

 16 44 



Hor. int. obtained 1 



I. M. S. 



1S367 



40S 



383 



39S 



Kew 



T 



18395 

 428 



407 



410 



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



I. M. S.- 

 Kew 



y 

 -28 



-20 

 -24 

 -12 



Remarks 



C. 1. W. magnetometer No. 13 at 

 Nm\ Kew data are from mag- 

 netograms based on Kew Jones 

 magnetometer observations at 

 0. 



-20. 0-> or -0.00109H 



It is assumed that any station-difference between piers N and m is negligible. 

 "Half set; weight 0.5. 



Table 10F. Results of Inclination Comparisons at the Kew Observatory, 1910. 



1 It is assumed that any station-difference between piers A < and A is negligible. 



SUMMARY. 



Table 10 G summarizes the chief results as already published in Volume 11 and as 

 given above. 



There is indication of a change in the standard at Kew in horizontal intensity 

 which may possibly arise from further change with time in the moment of inertia of the 

 magnet used in oscillations. It should be noted, however, in this connection that the 

 value (10c) is tentative pending restandardization of C.I.W. magnetometer Xo. 13 

 upon its return from field use. 



See Res. Dcp. Terr. Ma,j., Vol. II, pp. 240-243. 



