Report of the Kew Committee. 



123 



There have also been purchased on commission and verified : — 

 A Dip-circle for Dr. Mielberg, Tiflis. 



A Dip-circle for the Russian Expedition to the Mouth of the 

 Lena. 



Two Magnetograph-needles for Dr. Wild, St. Petersburg. 



There has been a satisfactory increase in the number of meteoro- 

 logical instruments verified, which was as follows : — 



Barometers, Standard 47 



,, Marine and Station 156 



Aneroids 21 



Total 224 



Thermometers, ordinary Meteorological 1487 



,, Standard 94 



Mountain 68 



Clinical 3638 



,, Solar radiation 57 



Total 5344 



Besides these, 22 Deep-sea Thermometers have been tested, 14 of 

 which were subjected in the hydraulic press, without injury, to strains 

 exceeding three and a half tons on the square inch, and 165 Thermo- 

 meters have been compared at the freezing-point of mercury, making 

 a total of 5,531 for the year. 



Duplicate copies of corrections have been supplied in 20 cases. 



A special set of Standard Thermometers has been constructed for the 

 Bureau International des Poids et Mesures, at Paris. 



Seventeen Standard Thermometers have also been calibrated and 

 divided, and supplied to societies and individuals during the year. 



Three Metre Scales have been divided on glass for the University 

 College Laboratory. 



The following miscellaneous instruments have also been verified : — 



Hydrometers 10 



Anemometers 12 



Bain Gauges 13 



Sextants 5 



Theodolites , 4 



Cathetometer Scales 2 



There are at present in the Observatory undergoing verification, 

 40 Barometers, 50 Thermometers, 1 Hydrometer, and 2 Anemometers. 



Anemometer Testing. — The Committee have had before them the 

 question of the desirability of erecting a suitable apparatus for the 



