When the discharge takes {HEAD ~ place} between {TAIL ~ the electrodes} 9a and 9b inside the tube 7, the pressure transmitting medium 8 quickly expands due to the discharge energy 
between
When the discharge takes { HEAD ~ place } between { TAIL ~ the electrodes } 9a and 9b inside the tube 7 , the pressure transmitting medium 8 quickly expands due to the discharge energy
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH