274 Dr. A. D. Denning on a Simple Method of 



Table I. 





Date. 



Temperatures. 



dT/dt. 



<T . 10 5 . 



TV. 



mo 



if 



l{ 



if 



-§ 1 

 -< 



o r 



o i 



29/11/04 

 12/12/04 

 12/12/04 



17/12/04 



19/12/04 

 19/12/04 



20/12/04 



20/12/04 

 20/12/04 



21/12/04 



21/12/04 



1000 C. 

 99-5 

 99-5 

 98-5 



78-6 

 78-6 

 78-6 



57 

 57 





 



18-7 0. 

 15-6 

 163 

 17-4 



14-8 



92 



14-5 



12-8 

 131 



152 

 14-7 



9-44 

 9-71 

 9-55 

 647 



4-95 



7-25 

 6-71 



4-24 

 4-24 



1-06 

 1-06 



5-19 

 5-30 

 5-22 

 3-36 



3-92 

 5-39 

 5-32 



5-43 

 5-46 



5-24 

 5-42 



(results recorded in Table II.) showed that easier manipulation 

 and equally satisfactory results were to be obtained by simply 

 placing hot water in A ; owing to the large bulk of water 

 which A could hold (nearly two litres), its rate of cooling 

 was comparatively slow ; whereas the observations necessary 

 for each experiment were made in less than a minute. 



Table II. 



Date. 



Temperatures. 



dT/dt 



a . 10 s . 



T °. 



nno 



27/1/05 

 27/1/05 



100-5 C. 

 100-5 



16-6 C. 



17-8 



9-83 

 9-83 



5-26 

 5-29 



28/1/05 

 28/1/05 



75-0 

 730 



17-8 

 17-8 



599 

 5-76 



5-30 



5-32 



28/1/05 

 28/1/05 



60-5 

 60-0 



17-6 



17-8 



4-32 

 432 



5-49 

 5-39 



28/1/05 

 28/1/05 



45-0 

 43-8 



15-5 

 15-8 



2-64 



2-40 



5-32 

 5-40 



31/1/05 

 31/1/05 





 



157 

 14-9 



1-08 

 1-08 



514 



5-48 



By quickly removing the radiator after sufficient readings 

 had been taken and placing the cotton-wool saturated with 



