ox ELECTRO-OPTICS. 



121 



On Electro-optics. — Report of the Committee, consisting of Dr. John 

 Kerr {Chairman), Mr. E. T. Glazebrook {Secretary), Lord 

 Kelvin, and Professor A. W. Rucker. 



The Comraif.tee report that Dr. Kerr's experiments have been continued, 

 and that he hopes sLortly to have further results ready for publication. 



Magnetic Work at the Falmouth Observatory.— Report of the Com- 

 mittee, consisting of Mr. Howard Fox, Professor A. W. Eucker, 

 and Professor W. G-. Adams. 



Magnetical Observations. 



[Made at the Falmouth Observatory, latitude 50° 9' 0" N. and longitude 

 5° 4' 35" W., height 167 feet above mean sea level, for the year 1892, 

 by Edward Kitto, Superintendent.] 



The results in the following tables, Nos. 1,2, 3, 4, are deduced from 

 the magnetograph curves which have been standardised by observations 

 of deflection and vibration. These were made with the collimator 

 magnet marked 66a, and the declinometer magnet marked 66c in the 

 unifllar magnetometer by Elliott Bros., of London. Table No. 5 is 

 deduced from these observations. 



The inclination was observed with the inclinometer by Dover, of 

 Charlton, Kent, No. 86, and needles 1 and 2, which are 3| inches in 

 length, the results of which appear in Table No. 6. 



The declination and horizontal force values given in Tables 1 to 4 

 are prepared 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 1892 which were 

 selected by the Astronomer Royal as suitable for the determination of 

 the magnetic diurnal variations, and which have been employed in the 

 preparation of the magnetic tables : — 



