]\leasurements of Precision in Platinum Thermometry. 547 



Table IV. 



Observations at the ice point. Thermometer K 5. 



i 

 (amperes). 



i\ 



Bridge wire 

 reading 

 =b.w.r. 



a; 3 = 



(i 2 - 0-00023). 



Af = A b.w.r. 

 = (b.w.r. -5-758). 



Calculated 

 correction 

 =i 2 X 162. 



0-015 



0-00023 



5-758 







0-037 C. 



0-020 



0-00040 



5-786 



000017 



0-028 



0-065 



0-039 



0-00152 



5-970 



0-00129 



212 



0-246 



0-040 



0-00160 



5-980 



0-00137 



0-222 



0-259 



0-050 



000250 



6-125 



0-00227 



0-367 



0-405 



0060 



0-00360 



6-300 



0-00337 



0542 



0-583 



0-01 1 



0-00012 



5-735 



0-00348* 



0-565* 



0-019 



2^/SAi 2 = l -936/0-01195 = 162, i. e. at about 0° C. 0-1 ampere 

 would necessitate the application of a correction of 

 l°-62 C. 



* These values are (0-00360 -i 2 ) and (6-300-b.w.r.) respectively. 



One hour afterwards the following results were obtained 

 when the thermometer was at the steam point. 



Table V. 

 Observations at the steam point. Thermometer K 5. 



i 

 (amperes). 



i 2 . 



b.w.r. 



0-010 



o-oooi 



6 315 



0020 



0-0004 



6-365 



0-030 



0-0009 



6 446 



0040 



0-0016 



6-570 



0-050 



0-0025 



6-721 



0-060 



0-0036 



6-902 



0010 



o-oooi 



6-312 



(* 2 



Af 2 = 

 -0-0001). 



0-0003 

 0-0008 

 0-0015 

 0024 

 0-0035 

 0-00351 



A/=Ab.w.r. 

 = (b.w.r. -6-315). 



0050 

 0-131 

 0-255 

 0-406 



0-587 

 0-590t 



Calculated 

 correction 

 = i 2 Xl68. 



0017 C. 



0-067 



0-151 



0-269 



0-420 



605 



0017 



;A*/SAi 2 =2-019/0-0120 = 168, i. e. at about 100° C. 0-1 ampere 

 would necessitate the application of a correction of 

 l°-68 C. 



f These values are (0-0036 -i 1 ) and (6-902— b.w.r.) respectively. 



