,530 Report of Magnetic al Observations at 



Keport of Magnetical Observations at Falmouth Observatory 

 for the Year 1894. Latitude 50 9' 0" N. and Longitude 

 5 4' 35" W. ; height, 167 feet above mean sea-level. 



These observations have been made by instruments purchased from 

 the Government Grant Fund administered by the Royal Society. 



The Observatory having been comparatively recently established, 

 the Vertical Force self-recording instrument is not yet in thorough 

 working order. It is hoped in future to publish complete records of 

 all three elements. 



Photographic curves of Magnetic Declination and of Horizontal 

 Force variations have been taken regularly throughout the past year, 

 and the. magnets have worked satisfactorily. 



The scale values of the instruments were determined on 1st 

 January, 1895. The following values of the ordinates of the photo- 

 graphic curves were then found : 

 Declination, 1 cm. = 11'* 7. 

 Bifilar, for 1 cm. d EL, = 0'00050 C.G.S. unit. 



The principal magnetic disturbances recorded during the year 

 occurred on the following dates : January 4, February 21, 23, 24, 

 25, March 30, 31, April 17, June 10, July 20, August 20, and 

 September 14, 15. 



Observations with the Absolute Instruments have been made 

 monthly, of which the following is a summary : 



Determinations of Horizontal Intensity, 35. 



Inclination, 34 sets of four. 



absolute Declination, 36. 



Following the method adopted in the three previous years, it is 

 intended that the observations be reduced, and that the Declination 

 and Horizontal Force curves for five quiet days in each month of the 

 year selected by the Astronomer Royal be tabulated and prepared 

 for publication, in accordance with the International scheme. The 

 results will be printed in the Royal Cornwall Polytechnic Society's 

 Annual Report, and also in the " Proceedings " of the Royal Society. 



The following are the principal results of the magnetic elements 

 for the year 1894 : 



Mean Westerly Decimation, 19 0''8. 



Mean Inclination, 67 2''4. 



Mean Horizontal Force, 0'18511 C.G.S. unit. 

 The Decimation and Horizontal Force are deduced from hourly 

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

 diurnal variation. 



