The Great Dive

Men and women have practiced breath-hold diving for centuries. Indirect tell comes from thousand-year-old undersea artifacts found on land (e.g., mother-of-pearl ornaments), and depictions of diverse in ancient drawings. In ancient Greece breath-hold divers atomic number 18 known to have hunted for sponges and engaged in soldiery exploits. Of the latter, the story of Scyllis (sometimes spelled Scyllias; about 500 B.C.) is perhaps the most famous. As told by the 5th century B.C. historian Herodotus (and quoted in many modern texts). In the 16th century people began to use up diving buzzers supplied with air from the surface, probably the first effective pith of staying under water supply for any length of time. The bell was held stationary a few feet from the surface, its bottom open to water and its top portion containing air compressed by the water pressure. A diver standing upright would have his head in the air. He could leave the bell for a minute or two to collect sponges or explore the bottom, then take for a short while until air in the bell was no longer breathable. In 16th century England and France, all-inclusive diving suits made of leather were used to depths of 60 feet. oxygenise was pumped down from the surface with the aid of manual pumps.



soon helmets were made of metal to withstand even greater water pressure and divers went deeper. By the 1830s the surface-supplied air helmet was perfected well up enough to allow extensive salvage work. Four major(ip) types of diving emerged from this.
Breath-hold diving is the earliest form of diving is cool off practiced for both sport and commercial. The breath-hold divers compressible air spaces argon squeezed by the increased water pressure throughout the dive. apiece dive, limited by the individuals tolerance for breath-hold and the risk of drowning from hypoxia, is usually a minute or less. Secondly, is diving in a heavy-walled vessel. Heavy-walled vessels tramp maintain their internal atmosphere at or underweight sea level pressure , and so prevent...If you want to sustain a full essay, order it on our website: Ordercustompaper.com



If you want to get a full essay, wisit our page: write my paper