1922 M. Joseph de Saint Martin

An extremely imaginative approach by Joseph de Saint Martin. His idea of cushioning the water pressure by putting a skeleton-like construction around the diver shows a lot of imagination. The suit will certainly be able to protect against the pressure up to a certain depth. However, if we go to a depth of, for example, 90 metres with a pressure of 10 bars and we take an opening of the frame at the thigh of 8 x 15 cm, we are talking about a surface area of 120 cm2. With a difference in pressure of 10 bar on the outside and 1 bar on the inside, a force of 9 bar x 1kg/cm2 x 120 cm2 = 1080 kg will be placed on the rubber cover. I suspect that few materials can withstand such a force. The patent describes in great detail the technique for making such a skeleton, but ignores the dynamics of the force distribution.

Claims;

Undergarment with metal frame allowing divers to descend to great depths while protecting them against the pressures surrounding them, characterized by

1. By steel bars arranged vertically. Slightly curved by their attachment to circles or semi-circles forming armour or protection for all parts of the body.

2. By means of circles of different diameters, arranged horizontally or vertically, keeping constant the distance and spacing of the steel bars forming the armour.

3. The free end of two spears are slid through steel slides, allowing forward bending of the torso and other parts of the body (fig.5).

4. By means of metal hinges connecting the different parts of the frame to each other, as well as by means of staples connecting the different parts that make up the undercarriage.