Report of the Kew Committee. 



167 



APPENDIX I. 



Magnetical Observations, 



Made at the Kew Observatory, Richmond, Lat. 51° 28' 6" 

 N. and Long. h l m 15 s 'l W., height 34 feet above mean 

 sea-level, for the year 1891. 



The results given in the following tables are deduced from the 

 magnetograph curves which have been standardised by observations 

 of deflection aud vibration. These were made with the Collimator 

 Magnet K.C. I. and the Declinometer Magnet marked K.O. 90 in the 

 9-inch Unifilar Magnetometer by Jones. 



The Inclination was observed with the Inclinometer by Barrow, 

 No. 33, and needles 1 and 2, which are 3J inches in length. 



The Declination and Force values given in Tables I to VIII are pre- 

 pared in accordance with the suggestions made in the fifth report of 

 the Committee of the British Association on comparing and reducing 

 Magnetic Observations. 



The following is a list of the days during the year 1891 which 

 were selected by the Astronomer Royal, as suitable for the deter- 

 mination of the magnetic diurnal variations, and which have been 

 employed in the preparation of the magnetic tables. 



January 4, 6, 27, 30, 31. 



February 4, 8, 18, 21, 22. 



March 8, 11, 19, 20, 29. 



April 5, 15, 19, 25, 30. 



May 1, 8, 21, 25, 31. 



June 1, 9, 17, 22, 30. 



July 2, 8, 12, 26, 31. 



August 5, 10, 18, 22, 27. 



September .' 5, 6, 18, 19, 25. 



October 6, 15, 16, 17, 22. 



November. 2, 8, 12, 19, 30. 



December 3, 6, 18, 26, 29. 



VOL. LI. N 



