562 Report of Magnetlca.l Observations at 



The Inclination was observed with the Inclinometer No. 86 by 

 Dover, of Charlton, Kent, and needles 1 and 2, which are 3^ inches 

 in length, the results of which appear in Table VI. 



The Declination and Horizontal Force values given in Tables I to 

 IV are prepared in accordance with the suggestions made in the 

 fifth report of the Committee of the British Association on com- 

 paring and reducing magnetic observations, and the time given is 

 Greenwich mean time, which is 20 min. 18 sec. earlier than local time. 



The following is a list of the days during the year 1893 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 7, 8, 15, 25, 26. 



February 1, 11, 13, 26, 27. 



March 10, 13, 18, 19, 20. 



April 4, 9, 21, 22, 23. 



May 2, 14, 17, 21, 28. 



June 8, 13, 17, 22, 24. 



July 5, 6, 10, 30, 31. 



August 1, 9, 16, 17, 27. 



September 4, 7, 13, 23, 24. 



October 9, 11, 16, 21, 22. 



November 7, 11, 15. 20, 21. 



December 7, 13, 18, 21, 22. 



The following are the principal results of the magnetic elements 

 for the year 1893 : 



Mean Westerly Declination, 19 6''4. 

 Mean Inclination, 67 5''3. 



Mean Horizontal Force, 0'18455 C.G.S. unit. 



The Declination and Horizontal Force are deduced from hourly 

 readings of the photographic curves, and so are corrected for the 

 diurnal variation. 



The Inclination is the mean of the absolute observations, the mean 

 time of which is noon. 



In Table V, X is the mean of the absolute values observed during 

 the month (generally three in number), uncorrected for diurnal 

 variations and for any disturbance. Y is the mean of the products of 

 the tangents of the Dips and the corresponding values of X. 



The whole of the instruments have been maintained in good order. 

 The Magnetic Chamber has been kept in a satisfactory state of 

 dryness, and the Magnetic Hut in the garden has been newly roofed 

 during the year. 



EDWARD KITTO, 



Magnetic Observer. 



