22 Experiments on the Transmission of Explosions. 



(r) TS= 198 mm. Vol. of air gap 83*5 cc. 



B was not fired. 

 (2) TS= 144 mm. Vol. of air gap 78-8 cc. 



B was not fired, though the bulb was filled with flame. 



The two experiments last mentioned bear out the con- 

 clusion that for a given mass of a gaseous explosive minture, 

 there is a certain minimum mass of air which will, if 

 interposed between it and another explosive mixture, guard 

 this last in the manner of a protective shield or plug, and that 

 it is practically immaterial whether this air be enclosed as a 

 short and broad, or a long and narrow column. 



