116 



Scientific Proceedings, Royal Dublin Society. 



Table IV. 



Eelation between pressure difference in reservoir and explosion-tubes and 

 mlvauometer deflection : — 



Length of explosion-tube, . 

 Diameter of explosion-tube, 

 Distance of junction from end, 

 Initial pressure in tube, 

 Pressure in reservoir varied. 



Deflection of 

 giilvannmeter. 



15 



24-5 



39 



57 



75 



95 

 135 

 160 

 182 

 200 

 215 

 225 

 230 



3 ft. 

 3 in. 



1 in. 



2 cm. 



For the last leadiiio- tlie pressure of air in the reservoir was increased by 

 means of a foi'ce-pump. 



20 



40 



60 



cm. 



80 



100 



120 



DiFFKllKNCE or I'RKSSllUli llKTWIiHN EeSKUVOIR AND Tl'UE. 



Cuuvi! 3. — Sliowing rehition lielwcen iiressinc diffeiencp in loservoiv and explosion -tube 

 and ffiilvanoiiieter deflection. 



