**The device presented has not been put in a
concrete form.**

About years 1950 in France,** René GIROD**
"invented" the logic of this principle of imbalance.

FONCTIONING

TRAVAUX des FORCES

BILAN ENERGETIQUE

Pistons **(1)** are associated to cylinders **(2)** and
watertight between them by a flexible membrane **(3)**.

Coupled 2 by 2 by a flexible air conduit **(4)**, they form a
pair of cylinder pistons which will be dived into the water.

3 éléments compose the complete system:

a mobile support which
comprises two rolls of rotation **(5)**. receiving the
cylinders**(5)**.

a flexible surface **(6)**
receiving the cylinders,

and pairs of cylinder
pistons **(7)** assembled symmetrically and inverted on the
flexible surface.

Two axes of rotation **(8)** support the whole.

**The weight of
the mass of the piston (P) is superior to Archimèdes' thrust (F)
exerted on the volume of air at a depth of water (h).**

**M:** mass of the piston ; **Pa( M ):**Archimèdes'thrust
of the mass M **p:** density of the liquid; water ( 1000
Kg/m³ ) ; **h:** depth of water **s:** surface of the
volume of air

The pistons composing the system are identical in
mass and volume. It is similarly for cylinders. All the elements
which constitute the device balance with regard to the fictitious
axis of symmetry. Thus the forces due to gravity **(P)**
cancel each other because of symmetry. The volume of the air will
come to unbalance the totality **(F)**.

Then the pairs of cylinder pistons realize the
tipping up.

**The number of pairs of cylinder pistons increases with the
width of the mechanism.**

P =1+2+3+4+5+6+7 |

** **** Then the force of gravitation enters in action.
Masses are going to position themselves to the lowest
(interdependent stop of the cylinder) by imposing to the volume
of air his place.As this imposed volume is found in low position,
the air becomes from weak pression to a high pression.
The air can not ascend to the cylinder of the high
(Pmass >Fair), it unbalances the complete system. **

inventory of works of forces during a cycle of a pair of cylinder
pistons

**Work of the hydrostatic force of the volume of air.**

**T air = pg(h1-h2)V **

g : acceleration

V : volume of air

P : density of the liquid; water ( 1000 Kg/m³ )

**Work of the force of gravity on the masses**

The work of the masses realize the transfer of air from the high
chamber to the low chamber. This masses are identical

**( M1 = M2 )**, and placed at different heights. **( h1 et
h2 )**.

The real mass working **( m )** will be equal to the mass of
the piston **( M )** Archimedes' thrust previously deduced )
less the hydrostatic force **( F )** exerted on the volume of
air at the depth **( h )**.

Work of the force of gravity on the mass 2

**T mass2 = m2 g2 (z2 -
z1)**

with **m2 = M2 - F2 et F2 = p h2 s**

Work of the force of gravity on the mass 1

**T mass1 = m1 g1 (z4 -
z3)**

with **m1 = M1 - F1 et F1 = p h1 s**

**COMPLETE SYSTEM**

The work is an algebraic size. When it is exerted on an object in
movement, its measure becomes positive, null, or negative.

In a system in rotation around an axis, the choice of a way of
rotation allows to identify if the work is motive, null or
resistant.

If one defines **T** as a motive work, **energy demand of the
complete system becomes:**

**Comparison of T mass1 and T mass2**

The acceleration being
identical, the work mass will correspond to an average mass.

working mass | m |

acceleration | g |

stroke of the mass | (z4 - z3) = (z2 - z1) |

work of masses |
T mass1 = T mass2 |

**The energy demand of the complete system is not null any more.**