PURPOSE: To manufacture hydrogen and oxygen and enable them to be used as a driving power for a power generating plant or a heavy weight machine by a method wherein combustible gas supplied under a high purity, combustible mixture gas, combustion supporting gas and their liquids are mixed just before explosion within a combustion furnace together with non-combustible liquid at a temperature lower than a predetermined temperature and then an explosion reaction is caused.

CONSTITUTION: As compressed air pushes up a compressed air holding lid 19 and forcedly enters a compressed air chamber 10, a piston valve 7 is gradually started to move upwardly. As a water and hydrogen force feeding pipe 13 and a water and oxygen force feeding pipe 14 are coincided with a piston valve oxygen and hydrogen supply chamber 8 and they communicate with it, water and hydrogen as well as water and oxygen are injected into the piston valve oxygen and hydrogen supplying chamber 8, an oxygen and hydrogen restricting lid 23 is opened and they are discharged into a spacing of a combustion chamber 24 of the combustion furnace. An ignition explosion reaction is caused with a hot air injected from a hot air injection hole and simultaneously the piston valve 7 is lowered. Repetition of such an operation as above causes a thermal dissociation of water and steam at a high temperature so as to produce hydrogen and oxygen and at the same time a high pressure and low pressure steam turbine is driven and it may be used as a driving source for a power generating machine or a heavy weight machine.