594 



(a) 



meter 



Mr. H. Redmayne Nettleton on a New 

 (6) Results. 

 Mean distances between thermometers by catheto- 





6*12 cms. 

 11-91 cms. 

 17-86 cms. 

 23*55 cms. 



(b) In the table below V denotes the weight of mercury 

 outflowing in 15 minutes. The spiral steam coil was used in 

 every case. The corrected temperatures ti — t b and the en- 

 closure temperature are given. 



Magnitude of flow. 



V=0 (ord. steady state) 



V=114-6gms 



V= 141-9 gms 



V=323-0gras. A 



V=3990gms. B 



V = 481-25gms.C 



V = 497'97 gms. D 



V = 543-88 gms. E 



¥=820-0 gms 



y = -j-268 gms. (flow hot to cold) 



70-9 

 66-2 



64-8 

 52-8 

 47-7 

 43 9 

 43-1 

 405 

 211 

 76-7 



52-0 

 455 

 435 

 305 

 261 

 22-6 

 21-5 

 19-7 

 10-0 

 63-6 



38-2 

 316 

 30-2 

 19-5 

 16-4 

 14-4 

 135 

 12-5 

 7-4 

 51-6 



*«• 



27-1 



221 



209 



131 



111 



10-1 



9-6 



90 



5-5 



41-1 



18-5 



15-0 



14-2 



93 



8-0 



7'4 



71 



6-5 



4-5 



30-5 



Enclosure 



19-5 



18-8 

 18-5 

 19-0 

 19-5 

 192 

 18-0 

 18-0 

 15 

 140 



The above are shown plotted as curves (PI. VII. fig. 2), 

 temperatures being represented hy ordinates, and distance 

 from the first thermometer (multiplied by five) being taken 

 as abscissae. 



(c) When the flow was from hot to cold the action of the 

 spiral was harmful. Accordingly a result is given which 

 was obtained earlier in the work with an experimental tube 

 fitted with thermometers 7 cms. apart, the first and fifth 

 being at the extreme top and bottom respectively of the 

 vertical portion of the tube. This result, when plotted, 

 shows that with a sufficient downward flow the temperature- 

 distance curve is concave as regards the origin — a result in 

 accordance with theory. 



State of vertical column. 



*i- 



t. r 



t 3 . 



t v 



*e 



Enclosure. 





75-0 



88-0 



53-5 

 790 



35-4 

 67-4 



22-1 

 541 



103 

 290 



190 

 190 



Flow of 39 c. cms. in 13 mins. 1 

 (hot to cold) J 



