glass liner that would collect any generated hydrocarbons the pressure vessel was equipped with electrical feeds the pressure vessel was evacuated and charged with argon at 500 psi to provide a chemically inert atmosphere for the experiment electrical current in the range of 18 to 19 amps was applied between electrodes 35 and 37 for 5 hours the thermocouple in core sample 30 measured a temperature of 268 u00b0 c after about 1 hour and thereafter tapered off to about 250 u00b0 c using calculation techniques that are well known to those skilled in the art the high temperature reached at the location of tray 36 was from about 350 u00b0 c to about 400 u00b0 c after the experiment was completed and the core sample 30 had cooled to ambient temperature the pressure vessel was opened and 0 15 ml of oil was recovered from the bottom of the glass liner within which the experiment was conducted the core sample 30 was removed from the pressure vessel and the resistance between electrodes 35 and 37 was again measured this post experiment resistance measurement was 49 ohms fig5 includes i chart 52 whose ordinate 51 is the electrical power in watts consumed during the experiment and whose abscissa 53 shows the elapsed time in 5 minutes during the experiment ii chart 62 whose ordinate 61 is the temperature in degrees celsius measured at.