436 Mr. F. Guthrie on the Influence of Temperature 



(3) Capillary tube partly immersed in a paraffin-bath at 



200° C. The end cooled to 22° C. 



*=10055". 



More of the tube being heated, 



(a) t = l098" 



(6) £ = 1094" Mean 1096". 



The effect of heating and cooling of the same current in dif- 

 ferent tubes in the same circuit was then examined. The 

 same tubes were timed separately and in conjunction at the 

 same and at different temperatures. 



Tube. Temperature. Time. 



1 24-5 C. 60" 



2 „ 57 



3 „ 58 



1 100 89 



2 „ 81 



3 „ 82 



1 + 2 .. 24-5 117 



„ 100 173 



1 1 10 ° 1 203 



. +2 + 3/ 21/ ^ 



^l}::::::::::;: 1 ??} 228 



These results show that the resistance of the sum is very 

 nearly the sum of the resistances, whether all the tubes are at 

 the same temperature or some at one temperature and some 

 at another. 



In order to ascertain whether the rate of passage followed 

 any special law at the beginning or end of the tube, the time 

 of the passage of a given mass of air thrust through a given 

 tube at a given pressure and temperature was ascertained ; 

 the tube was then divided into parts, and the time of the 

 passage of the same bulk of air through each part was measured. 





20° C. 



100° c. 



Entire tube 



Part 1 



372-5 

 89-5 



1175 

 63 



101 



2085 



165 



563 

 133 3 

 180 

 9(r5 

 152 

 315-6 

 2466 



„ 2 



„ 3 



„ 4 



„ 1+2 



„ 3+4 .. 



