Report of the Kew Committee. 95 



Thermometers, ordinary Meteorological 1165 



Standard 116 



,, Mountain 39 



Clinical 7255 



Solar radiation 35 



Total 8610 



Besides these, 51 Deep-sea Thermometers have been tested, 2 of 

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

 pressures exceeding three and a half tons on the square inch, and 78 

 Thermometers have been compared at the freezing-point of mercury, 

 making a total of 8739 for the year. 



Duplicate copies of corrections have been supplied in 17 cases. 



The number of instrumeDts which were rejected on account of 

 excessive error, or which from other causes did not record with suffi- 



cient accuracy, was as follows : — 



Thermometers, clinical 19 



,, ordinary meteorological 4 



Barometers 31 



Seven Standard Thermometers have also been calibrated and 

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



A Barograph and Thermograph have been examined, and had their 

 scale values determined for the Hong Kong Observatory, also a 

 Barograph for the Japanese Hydrographic Department, and a large 

 Anemograph for the Zi-Ka-Wei Observatory. 



The following miscellaneous instruments have also been verified : — 



Hydrometers 59 



Anemometers 12 



Rain Gauges 9 



Theodolite , 1 



Sextants 55 



Index and Horizon Glasses, unmounted ......... Ill 



Dark Glasses, unmounted 277 



Prismatic Compasses 2 



Marine Telescopes 3 



There are at present in the Observatory undergoing verification, 

 27 Barometers, 932 Thermometers, 1 Anemometer and 4 Sextants, 

 and a self -registering Aneroid for the Meteorological Council. 



The Committee have recently revised the regulations for the verifi- 

 cation of graduated instruments, fixing a linear value equal to 

 0*01 inch or 0*25 millim. as the limit to which corrections are to be 

 assigned to scales intended to be read by the unassisted eye. 



