Abstract
In this paper we report the result of investigation of the variation of discharge current in rectangular tube with discharge voltage for N2 and CO2 gases, these experiments are conducted for gas pressure from (0.75 Torr) to (7.5 Torr). Sparking voltages are measured for these gases over this range of pressure as well as the relations between electric field (E/P) with (P), variation of discharge resistance (R) with (P) and conductivity ()as a function of (P). These results show that the sparking potential vary with the product (pd) in accordance with paschen curve. The discharge characteristic is similar to the conventional discharge tube except the relation of (E/P) as a function of (P) .
