Report on the Observatory Department, 



423 



V. Verification of Instruments. 



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

 1900, compared with a corresponding return for 1899 : — 



Number tested in the year 

 ending December 31. 



< " > 



1899. 1900. 



Air-meters 6 9 



Anemometers 23 1 



Aneroids 175 197 



Artificial horizons 9 27 



Barometers, Marine 92 139 



„ Standard 85 57 



„ Station 15 23 



Binoculars ... 404 963 



Compasses 43 51 



Deflectors 6 1 



Hy drometers 241 173 



Inclinometers 9 17 



Photographic Lenses 160 136 



Magnets 3 1 



Telescopes 561 1,345 



Bain Gauges 19 4 



Bain-measuring Glasses 44 29 



Scales — 1 



Sextants 876 813 



Sunshine Becorders 6 3 



Theodolites 24 . 12 



Thermometers, Avitreous or Immisch's 5 — 



Clinical 16,020 20,476 



,, Deep sea 19 83 



HighBange 62 40 



Hypsometric 39 66 



LowBange 103 33 



Meteorological .... 2,892 2,786 



,, Solar radiation — 2 



Standard 104 61 



Unifilars 5 5 



Vertical Force Instruments 1 14 



Declinometers — 1 



Total 22,051 27,569 



Duplicate copies of corrections have been supplied in 56 cases. 

 VOL. LXVIIL 2 H 



