Depth meter for diving purposes

Claim 1

A FLUID DEPTH METER COMPRISING A CASING WHIHC DEFINES A HOLLOW CHAMBER, THE CASING BEING MADE OF FLEXINLY DEFORMABLE MATERIAL, SUCH AS PLASTIC OR THE LIKE, AND COMPRISES A CONCENTRIC SIDE WALL AND A BOTTOM WALL, SAID BOTTOM WALL INCLUDING AN INTEGRAL DIAPHRAGM, SAID SIDE WALL INCLUDINGIN SPACED PERIPHERAL GROOVES ON THE INNER SURFACE THEREOF, A TRANSPARENT MEMBER SEALING ONE END OF SAID CHAMBER IN FLUID TIGHT RELATIONSHIP WITH THE EXTERIOR THEREOF, SAID TRANSPARENT MEMBER BEING PERIPHERALLY HELD IN ONE OF SAID GROOVES, A BOURDON GAUGE WITHIN SAID CHAMBER, SAID BOURDON GAUGE COMPRISING A DIAL FACE WHICH IS PERIPHERALLY HELD IN ANOTHER OF SAID GROOVES, SAID CONCENTRIC SIDE WALL BEING RADIALLY OUTWARDLY DISPLACEABLE TO AN EXTENT WHEREBY SAID TRANSPARENT MEMBER AND SAID DIAL FACE MAY BE WITHDRAWN FROM THEIR RESPECTIVE GROOVES, SAID SIDE WALL ALSO BEING RESISLIENTLY RETURNABLE TO A POSITION WHEREAT SAID TRANSPARENT MEMBER AND DIAL FACE PERIPHERALLY FIT WITHIN SAID GROOVES, AN INCOMPRESSIBLE FLUID FILLING SAID CHAMBER, SAID INTEGRAL DIA-/ PHRAGM OF SAID CASING BEING RELATIVELY THIN AND THE REMAINDER OF THE BOTTOM WALL AND CONCENTRIC SIDE WALL OF SAID CASING BEING RELATIVELY THICK, SAID DIAPHRAGM BEING OF ONE PIECE CONSTRUCTION WITH THE BOTTOM WALL, BEING FLEXIBLY DEFORMABLE, AND HAVING ONE SIDE THEREOF EXPOSED TO THE EXTERIOR OF SAID CHAMBER,