Errors of Types of Minimum Spirit Thermometers. 



423 



which become + 0-31° and — 0*30° respectively, if we consider the 

 correction for steady temperatures (— 0*21° *) to be the true working 

 correction of No. 1,470. 



It will also be noticed that the results for " steady temperature " 

 are practically identical at Oh. and 12h., showing that there is no 

 systematic error, due to evaporation and condensation, produced by 

 rising and falling temperatures. 



The above results point to the existence of a considerable amount 

 of "lag " in No. 1,470, and are corroborated by observations made 

 during the rapidly changing temperatures which occur in heavy rain 

 showers, the results of which are given below. 



TABLE III. 



Comparisons between the Eeadings of Minimum Thermometer 

 no. 1,470 and those of the thermograph standard no. 714 

 during A Rapid Fall of Temperature on July 10, 1906. 







Standard 

 No. 714. 



Minimum 



Excess of 



Time. 





Thermometer 



No. 714 over 







No. 1,470. 



No. 1,470. 



h. m. 



s. 











o 



12 59 



30 



72-3 



72-8 



-0-5 



13 



15 



71-4 



72-4 



-1-0 



1 







70-4 



72-1 



-1-7 



1 



45 



69'4 



71-5 



-2-1 



2 



30 



68-9 



71-2 



-2-3 



3 



15 



68-6 



70-8 



-2-2 



4 







67-9 



70-2 



-2-3 



4 



45 



67-8 



69-9 



-2-1 



5 



30 



67-4 



69-4 



-2-0 



6 



15 



67-1 



69-0 



-1-9 



7 







66-9 



68-9 



-2-0 



7 



45 



66-9 



68-4 



-1-5 



8 



30 



66-8 



68-1 



-1-3 



9 



15 



66-7 



68-0 



-1-3 



10 







66-8 



67-9 



-1-1 



10 



45 



66-7 



67-8 



-1-] 



11 



30 



66-6 



67-6 



-1-0 



12 



15 



66-7 



67-5 



-0-8 



13 







66-9 



67-3 



-0-4 



13 



45 



66-9 



67-3 



-0-4 



14 



30 



67-0 



67-3 



-0-3 



15 



15 



67-0 



67-2 



-0-2 



16 







67-1 



67-3 



-0-2 



13 39 





68-9 



68-2 



+ 0-7 



40 





69-5 



68-6 



+0-9 



41 





69-8 



68-9 



+0-9 



45 





70-4 



69-5 



+0-9 



* Standard No. 714 has an index error of + 0*11 which has not been applied. 

 This makes the correction to No. 1,470 for steady temperatures — 0*31° (cf. p. 434). 



