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