McClki.land and Gill — Self- Ignition of Ether- Air Mixtures. 115 



Table III. 



(i) Length of explosion-tube, 

 Diameter of tube, 

 Initial pressure of air in tube, 

 Pressure in reservoir, 



2 ft. 



3 in. 

 2 cm. 

 atmospheric. 



Distance of jmiedon from 

 end of tube. 



1"5 cm. 



5-0 

 lO-O 

 15'0 

 25-0 

 35-0 

 45-0 

 55-0 



Defleotion of 

 giilvaiionietei', 



135 

 166 

 146 

 102 



66 

 • 41 



32 



23 



15 



30 



45 



Distance of Junction fuom end of Tuiu:. 



CuuvE 24, — Sliowiny leliilion Ijclween galviinonieler defleilion and di.-itance of junction 

 from closed end of explosion-tube. Tube 2 feet long. 



In all cases where the junction was very near the disc closing the explo- 

 sion-tube, the temperature as indicated by the deflection of the galvanometer 

 fell off. This fall ing-ofi' was, no doubt, due, in part at least, to the cooling 

 effect of the neighbouring metal disc. 



