97 be either increased or decreased depending upon the vaporization point of the liquid stored therein this then contemplates that a number of integral components of the subject invention be modified in accordance with the vaporization point of the liquid stored within tubular coil 97 thus for example utilization of a smoke producing agent such as polyethylene glycol 200 which has a higher vaporization temperature than propylene glycol by portable battery operated smoke generator 11 may require that direct current voltage source 23 increase the current supplied to tubular coil 97 in addition as mentioned above heat fusible relief disk 49 and heat fusible actuator rod 117 are fabricated from a lead tin alloy which depending upon the percentage of lead and the percentage of tin therein determines the melting point of heat fusible relief disk 49 and heat fusible actuator rod 117 this in turn requires that heat fusible relief disk 49 and heat fusible actuator rod 117 be fabricated in accordance with the vaporization temperature of the smoke producing agent utilized by portable battery operated smoke generator 11 referring now to fig1 and 3 activation of normally open push button switch 127 triggers one shot multivibrator 133 which produces at the output thereof a logic pulse having a predetermined pulse width the logic pulse produced by one shot multivibrator 133 is then supplied to npn transistor 131 so as to switch on the aforementioned npn transistor this in turn switches on npn transistor 132 which switches on npn transistor 135 so as to allow the direct current provided by direct current voltage source 23 to pass through tubular coil.