First Type.—Four operations.
(a) Charging the cylinder with explosive mixture at atmospheric pressure.
(b) Exploding the charge.
(c) Expanding after explosion.
(d) Expelling the burnt gases.
Second Type.—Five operations.
(a) Charging the pump cylinder with gas and air mixture at atmospheric pressure.
(b) Compressing the charge into an intermediate receiver.
(c) Admitting the charge to the motor cylinder, in a state of flame, at the pressure of compression.
(d) Expanding after admission.