84 



Report of the Kew Committee. 



nometrically determining the height of clouds. The experiments are 

 still in progress. 



Verifications. — The Committee have to report that the work of this 

 department of the Observatory is still increasing, and its field ex- 

 tending, the makers who send instruments for examination, from 

 places both at home and abroad, is continually becoming more 

 numerous. 



The following magnetic instruments have been verified, and had 

 their constants determined : — 



A set of Magnetographs for the Brussels Observatory. 



A Unifilar for Messrs. Negretti and Zambra. 



A Unifilar for the Dutch Arctic Expedition. 



A Dip-circle „ ,, 



A Fox Circle „ ,, 



An Azimuth Compass ,, ,, 



Two Azimuth Compasses for Mr. H. M. Stanley. 



A Dip- circle for the Austro- Hungarian Government. 



There have also been purchased on commission and verified : — a 

 Unifilar and Dip-circle for the Marine Observatory, San Fernando, 

 Spain ; a pair of Dipping-needles for Professor Wild, St. Petersburg ; 

 a Unifilar, Dip-circle, and Fox Circle for Captain Carl Wille, Horten, 

 Norway ; a Dip-circle for Senhor Capello, Lisbon Observatory. There 

 are also now undergoing verification a Dip-circle for Lieutenant van 

 Hasselt ; a Dip-circle for the Austro-Hungarian Government ; a 

 Unifilar, Dip- circle, and Fox Circle for Professor Greene. 



Two Sextants have been verified. 



The following meteorological instruments have been verified, this 

 portion of the work being entrusted to Mr. T. W. Baker, assisted by 

 Messrs. Foster, Constable, and Gunter : — 



Barometers, Standard 56 



„ Marine and Station 137 



.Total 193 



Aneroids 29 



Thermometers, ordinary Meteorological .... 1435 



,, Boiling-point Standards .... 47 



,, Mountain 16 



Clinical 2032 



,, Solar radiation 65 



Total 3595 



