An adjustable focus x ray tube has its cathode connected to {TAIL ~ the negative side} of a dc power supply which is below ground by half of the total voltage applied to the tube and its anode connected to {HEAD ~ the positive side} of the supply which is above ground by half of the applied voltage 
An adjustable focus x ray tube has its cathode connected to { TAIL ~ the negative side } of a dc power supply which is below ground by half of the total voltage applied to the tube and its anode connected to { HEAD ~ the positive side } of the supply which is above ground by half of the applied voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH