"And this wire is positioned between the junctures of the reeds, inside the pieces of leather that bind these reeds together, so that the potential that
presses around this leather will not come to close it in, because this potential is very great. And this leather
that covers the iron must be double, so that if the one on the outside breaks, the one inside will not be consumed."
"Leonardo drew the mask for a diver joined by means of two reeds to a floating device in the form of a diving bell, which he called “bellows” (used in the more general sense of any type of blower or apparatus for the passage of air). The reed hoses for breathing are joined using joints covered by a double layer of leather, and a spiral of iron inserted into the joints prevents them from being crushed by the water pressure."
The model is based on the drawing:
- Codex Arundel f. 24 v. (1508)
London, British Library