The major difference was that the air after having passed through the cylinders, passed again through the cylinders by means of a compressor at the side, causing a continuous circulation and enough perpetual movement to last three months
Errr... OK. So what powers the compressor then?
Anything which mentions 'Perpetual' and 'Movement' together ignores the laws of Thermodynamics i.e. You can't get more out that you put in.
Heck, you can't even get as much out as you put in due to thermal, and friction losses.