New Method' of Determining Thermal Conductivity. 587 



X. 



v. 



*• 



1 



91 



1 



•906 



10-3 



4/5 



•893 



10-84 



3/4 



•738 



11-2 



3/5 



•66 



11-77 



1/2 



•498 



11-78 



5/13 



•367 



11-928 



7/25 



•2887 



11-96 



9/41 



•1381 



11-97 



19/181 



, . -0528 



11-78 



49/1200 



•0259 



11-68 



99/4901 



The University, Manchester, 

 January 14, 1909. 



Note added Feb. 28th, 1910.— It lias been pointed out to 

 me that the problem has been treated from a similar point of 

 view by G. Herglotz in a short note, Phys. Zeitschr. 1907, 

 p. 145. 



LXII. On a New Method of Determining Thermal Conduc- 

 tivity. By H. Redmayne Nettleton, B.Sc, Assistant 

 Lecturer in Physics at Birkbeck College *. 



[Plate VII.] 



(1) Introduction. 



(2) Theory. 



(3) Application to Liquids. 



(4) Apparatus. 



(5) Method of Experiment. 



(6) Results. 



(7) Calculation of Thermal Conductivity. 



(8) Conclusion. 



(1) Introduction. 



AN expression for the concentration of a solution in a 

 vertical tube along which there is both movement of 

 the solution and diffusion of the solute has been obtained by 

 Dr. A. Griffiths (Phil. Mag. Nov. 1898), who pointed out to 

 the author that a similar expression could be obtained in the 

 case of thermal diffusion and suggested the present investi- 

 gation, the object of which is : — 



1st. To find the effect of impressed velocity on tempera- 

 ture gradient. 



* Communicated by the Physical Society : read February 25, 1910. 



