Report of the Kew Committee. 



Ill 



At the request of Dr. B. Van Rijckevorsel, observations have been 

 made with, dip-needles constructed of nickel, and also with others of 

 steel nickel plated in order to avoid the injurious effects of rust. The 

 nickel plating proved successful ; but it was found impossible to 

 impart a sufficient degree of magnetism to the nickel needles to allow 

 of their giving reliable results. 



The magnetic instruments have been studied, and a knowledge of 

 their manipulation obtained by Dr. Chistoni and Dr. Harris. 



Information on matters relating to terrestrial magnetism and various 

 data have been supplied to Professor W. G. Adams, Mr. Adie, Pro- 

 fessor Barrett, Messrs. Barker and Son, Mr. Casella, Professor G. C. 

 Foster, Mr. J. E. H. Gordon, Mons. Marie-Davy, Dr. Bijckevorsel, 

 and Professor Balfour Stewart. 



The following is a summary of the number of magnetic observations 

 made during the year : — 



Determinations of Horizontal Intensity , . 25 



Dip 164 



,, Absolute Declination 37 



II. Meteorological Observations. 



The several self-recording instruments for the continuous registra- 

 tion respectively, of atmospheric pressure, temperature, humidity, 

 wind (direction and velocity), and rain have been maintained in 

 regular operation throughout the year. 



New fume pipes have been fitted over the thermograph and electro- 

 graph to carry off the products of combustion of the gas more 

 efficiently than the old ones, which had become much corroded. 



The standard eye observations made five times daily, for the con- 

 trol of the automatic records, have been duly registered through the 

 year, together with the additional daily observations at h. 45 m. 

 p.m. in connexion with the Washington synchronous system, and at 

 6 h. 45 m. p.m., for the second synchronous system organized by 

 M. Mascart, Directeur du Bureau Central Meteorologique, Paris. 



The tabulation of the meteorological traces has been regularly 

 carried on, and copies of these, as well as of the eye observations, 

 with notes of weather, cloud, and sunshine have been transmitted 

 weekly to the Meteorological Office. 



The following is a summary of the number of meteorological obser- 



vations made during the past year : — 



Headings of standard barometer 1934 



,, dry and wet thermometers 6546 



,, maximum and minimum thermo- 

 meters 2] 96 



VOL. XXXI. K 



