mMi'\i:ixu\ fir IM.ATINVM AND <;AS TIIKI;M<>MI:TI.I> 



85 



XXXVI. COMPARISONS BETWEEN PLATINUM THKUMOMETER K.8 AND THE 



NmtntiKN TIIKK.MOMICTKI:. 



These rcinijiarisniis \\ ere ni.-ulc iu tin- iiil-liuth previously described (Section XXIX). 

 Fig. 17 shows the arrangement of the two instruments in the mniparison-lKith. For 

 the first series lietween 88 and llfi water w;us employed in the jacket. 



Simultaneous observations of the two instruments were made by the authors while 

 an assistant worked the stirrer. 



Each comjwirison at any one temperature consisted of ten observations. To 

 eliminate slight uncertainties due to thermoelectric effects the lottery current was 

 always reversed after the first five leadings. 



The second series of observations, extending from 120 to 160, was obtained by 

 the ebullition of paraxylene, and the final series up to 190 with aniline. 



As we have indicated in the rdsumd of the zeros on p. 82, the comparisons of K.8 

 with the nitrogen thermometer may be divided into two groups, the first extending 

 from 88 to 161 (March 23 to April 2) and consisting of twenty -six observations, the 

 second from 89 to 190 (May 14 to 24) and comprising twenty-two observations. 



We give as example of a comparison the observations of May 24 at 188*6. 



NITROGEN Thermometer Headings, 24th May. 



