How scuba gear was invented.
The history of diving equipment goes back a lot of time. One of the last stages of it – scuba diving – belongs to the category of open-cycle devices, that is, air comes from a cylinder, and exhalation is discharged into the surrounding water.
It is known that the honor of creating scuba belongs to Jacques-Yves Cousteau. But far fewer people know that the first approaches to such devices were also undertaken in France, and long before him. In the middle of the last century, Naval Lieutenant Deneiroz and mining engineer Rouqueyrol independently created a device based on the membrane principle of pressure reduction. More precisely, Rouqueyrol was trying to develop a technique for autonomous breathing during mine rescue operations. Deneiroz, having received information about such a system, realized that it could also be used underwater. An early prototype scuba tank was even patented. But due to the lack of high-pressure cylinders, there was no question of any autonomy from the air supply through the hose. Their standard capacity was only enough for a few minutes without refueling.
For sixty years, divers have used either such systems or closed rebreathers.
And in 1936, the Frenchman Priyor again made a device that stably supplied air from a cylinder, where it was already under much higher pressure. The mask was also blown with air and cleaned of water. It was the first vehicle for autonomous diving. On the other hand, the inhalation valve was opened manually, which caused a lot of inconvenience.
Closed-loop diving equipment appeared at the end of the eighteenth century. For example, the Henry Flux system of 1787 supplied oxygen rather than air to the mask, while exhalation products were passed through a reservoir with a reducing agent, which converted them back into oxygen. The disadvantage of the Flux model was that it could not be used at depth. And in 1911, the Englishman Robert Davis improved the rebreather with a pressure reducing valve that injected oxygen slowly and at a preset pressure.
Such systems were used in fires and to protect against chemical weapons, and later for emergency exits from submarines.
Cousteau came up with the idea of using a system similar to that used to supply gas to car engines to improve diving equipment. The advantage was that, regardless of the depth, the air was supplied automatically and at the right pressure. Los bonos sin depósito son los más buscados porque no requieren invertir tu dinero al inicio. Sin embargo, un bono sin depósito suele tener condiciones estrictas: rollover alto, límite de ganancia máximo y verificación obligatoria. Puedes recibir 200 pesos gratis para probar la plataforma, pero si ganas 1,000 pesos, quizás solo puedas retirar 500. No todos los bonos sin depósito son malos, pero debes leer la letra pequeña. Son ideales para conocer una casa sin compromiso, pero no esperes hacerte rico rápidamente con ellos.