1930 Vivian Roy McBride

The invention of the Australian McBride concerns an injector type air pump with which the inventor can increase the low pressure of the exhaled air in the inner suit of a diver. This allows the exhaled gas to be released into the diver’s environment. The invention is applied to the invention of Ernest Reginald Clifford. In 1926, he constructed a suit with an inner and outer suit where the outer suit could withstand pressure from the environment. This somewhat strange way of thinking looks back to the time of Lethbridge and Rowe when blood accumulation due to local pressure differences considerably shortened dive times.

Divers’ dress.-A divers’ dress comprises an inner and outer rigid corselet and an inner and outer rigid helmet, the space between forming an outer high pressure zone to support the external pressure, while the inner space form a relatively low pressure zone in which the diver breathes. The dress shown comprises an under suit 1 of rubberized fabric or similar material enclosing the body and limbs up to the bottom of a metal corselet 2. The corset 2 and the helmet 3 are provided with inner walls 4, 5, the top of the under suit being attached to the bottom of the inner corselet. The inner walls 4, 5 are connected together by bolts 8 and are attached to the outer corselet and helmet by bolts 9 and distance pieces 10. The ordinary flexible diving suit 12 is secured to the bottom of the outer corselet. The space between the helmets and corselets is supplied through a pipe 13 with air at high pressure, while air at lower pressure is supplied to the interior of the inner helmet by a pipe 14. Oxygen or oxygen diluted with helium may also be supplied from a container and regenerator 16.