218 



Report of the Kew Committee. 



Brought forward 251 



Hydrometers 274 



rnclinometers 3 



Magnets 6 



Rain Gauges , . . 7 



Range Finders 17 



Sextants 145 



,, Shades 52 



Sunshine Recorders 2 



Theodolites 11 



Thermometers, Arctic < 98 



„ Avitreous 2641 



„ Chemical 95 



Clinical 8668 



,, Deep sea 35 



„ Meteorological 1370 



„ Mountain 30 



„ Solar radiation 9 



,, Standards 43 



Unifilars 4 



Total 13,761 



Duplicate copies of corrections have been supplied in 75 cases. 



The number of instruments rejected on account of excessive 

 error, or which from other causes did not record with sufficient 

 accuracy, was as follows : — 



Thermometers, clinical 64 



,, ordinary meteorological 50 



Various 232 



5 Standard Thermometers have also been calibrated, and supplied 

 to 4 societies and individuals during the year. 



There are at present in the Observatory undergoing verification, 

 21 Barometers, 462 Thermometers, 2 Hydrometers, and 10 Sextants. 



The Committee, after considering the question of certifying the 

 various and numerous classes of instruments on the hydrometer prin- 

 ciple, have authorised the Superintendent of the Observatory to refuse 

 to verify any instruments except such as either indicate specific 

 gravities directly or whose indications bear a known and well-defined 

 relation to specific gravities. 



Several patterns of range-finders, for use both at sea and on shore, 

 have also been tested ; two additional movable adjustable collimators 

 with scales having been fitted to the sextant testing apparatus, to 

 enable it to be used for this purpose. 



