Report of the Keio Committee. 



89 



Owing to long usage the points of the Dip-needles Nos. 1 and 2 of 

 Circle No. 33, used for monthly observations, were very blunt ; they 

 were accordingly re-ground by Mr. Dover in August, and the axles at 

 the same time repolished. 



The Committee have to acknowledge with thanks the receipt of 

 photographic copies of magnetic curves from the Observatory at 

 Batavia. 



The magnetic instruments have been studied, and a knowledge of 

 their manipulation obtained by — 



Dr. Doberck. 



Lieutenant A. P. Pinheiro. 

 Dr. O'Reilly. 



Information on matters relating to terrestrial magnetism, and 

 various data, have been supplied to Dr. Buys Ballot, Padre Denza, the 

 Rev. F. Howlett, M. l'Abbe Philippe, and others. 



The Unifilar Magnetometer returned by Rev. S. J. Perry, F.R.S., 

 on his arrival in this country from Madagascar was lent to Professor 

 W. G. Adams, F.R.S., for use in the Wheatstone Laboratory, King's 

 College, London. Another Unifilar and Dip-circle have been lent to 

 Professor 0. Lodge, for use in the University College, Liverpool. 



A Dip- circle with bar-magnets has been lent to Dr. E. van 

 Rijckevorsel for use in an expedition to Central America. 



The monthly observations with the absolute instruments have been 

 made as usual, and the results are given in the tables forming 

 Appendix I of this Report. 



The following is a summary of the number of magnetic observations 

 made during the year : — 



Determinations of Horizontal Intensity 35 



Dip 123 



,, Absolute Declination 29 



At the request of the Rev. S. P. Ferrari, of the private astrono- 

 mical observatory on the Janiculan Hill, Rome, the superintendent 

 designed a set of Magnetometers, for eye observations, on a new 

 pattern, much less costly than the Kew magnetographs. 



They were erected in the Verification House, and after a satisfactory 

 trial, were dismounted and forwarded to M. l'Abbe Philippe for the 

 Observatory at Lyons. 



A set of Magnetographs has been ordered on behalf of the American 

 Government, and is now in process of construction. 



II. Meteorological Observations. 



The several self-recording instruments for the continuous registra- 

 tion respectively of atmospheric pressure, temperature, and humidity, 



