The Model 35 had three major elements: the tank, the lance and the ignition system. The tank was carried via two transport belts and padded back. It was composed of two cylinders. Each was divided internally into two parts by a metal diaphragm. The two upper sections were linked together and could hold 6 litres of
nitrogen at a pressure of 20
atmospheres, which acted as a propellant. The lower halves were also connected and contained 12 litres of fuel, a mixture composed of 9 parts
diesel oil and 1 part
gasoline. Both substances were loaded from special openings on the upper end of the cylinders, where a manual valve conveyed the liquid nitrogen in the tank to pressurize them at the moment of use. The filler pipe coupling of the lance was located in the lower part of the tank, beside the right cylinder. The lance has a control lever (of lightweight alloy) that connects to the tank through a hose. At the muzzle of the lance, a large flange ("
cartoccia") has a double ignition system. The main system was initially made of two sharpening sheets of steel, with
flint and rollers to create sparks from friction, actuated by the control lever. It was later replaced by an electrical system: a square box, placed behind the cylinders housed an 18
volt battery with a dynamo for manual recharging. Two electric cables run up the lance to the flange, each serving as a
spark plug similar to that of a car. The spark ignited the jet of gas that poured from the lance. A secondary system consists of the "
bengalotto," a slow-burning pyrotechnic device that is manually ignited and mounted on the weapons sight, burning for 2 minutes. On the passage of the flammable liquid, operated by the lever on the lance, it launched a dart of up to 20 meters range, which produced a heat zone 35 meters wide and 15 deep. The "
bengalotto," however, though simple and reliable, was prone to revealing the user's position to enemy forces. The weapon was carried by two soldiers,
flammieri, protected by fireproof vests. The system, due to its weight and the overall dimensions of the fireproof suit, could be carried only for short distances. It was normally transported on trucks or on special donkey saddle. The flammable liquid reserves allowed about 20 discharges. Recharging the weapon could take 20 minutes or more. == Model 40 ==