346 



Be;port of the Kew Observatory Committee, 



V. Verification of Instruments. 



The subjoined is a list of the instruments examined in the year 

 1899, compared with a corresponding return for 1898 : — 



Number tested in the year 





ending December 31. 



A 





1898. 



1899. 





1 



6 





11 



23 





169 



175 



Artificial horizons 



9 



9 



Barometers, Marine 



122 



92 





58 



85 





55 



15 





374 



404 





44 



43 





3 



6 





463 



241 





5 



9 



Photographic Lenses 



13 



160 



Magnets 



2 



3 



Navy Telescopes 



681 



561 



Eain Gauges 



12 



19 



Eain-measuring Glasses 



10 



44 



Scales 



2 







Sextants 



750 



876 



Sunshine Eecorders 



15 



6 





26 



24 



Thermometers, Avitreous or Immisch's 



10 



5 





17,962 



16,020 



„ Deep sea 



79 



19 



„ High Eange 



56 



62 



„ Hypsometric 



38 



39 



„ Low Eange 



94 



103 



„ Meteorological 



3,296 



2,892 



„ Solar radiation 



2 





„ Standard 



66 



104 





6 



5 



Vertical Force Instruments 





1 



Declinometers 







Total 



24,434 



22,051 



Duplicate copies of corrections have been supplied in 97 cases. 



