Scientific amusements . The principle of the diving-bell. Fluids generally. The fire-engine is another example,but we will now proceed to explain the diving-bell alreadyreferred to. The experiment of the diving-bell, which is so simple, isexplained farther on. It belongs to the same category ofexperiments as those relating to the pressure of air and 8o GASES AND LIQUIDS, compression of gas. Two or three flies have been intro-duced into the glass, and they prove by their buzzing. Diver under water. about that they are quite at their ease in the ratherconfined space. The Diving-Bell in a crude f
Scientific amusements . The principle of the diving-bell. Fluids generally. The fire-engine is another example,but we will now proceed to explain the diving-bell alreadyreferred to. The experiment of the diving-bell, which is so simple, isexplained farther on. It belongs to the same category ofexperiments as those relating to the pressure of air and 8o GASES AND LIQUIDS, compression of gas. Two or three flies have been intro-duced into the glass, and they prove by their buzzing. Diver under water. about that they are quite at their ease in the ratherconfined space. The Diving-Bell in a crude form appears to have THE PUMP. 81 been used as early as 1538. It was used by two Greeksin the presence of the Emperor Charles V., and numerousspectators. In the year 1720 Doctor Halley improvedthe diving-bell, which was a wooden box or chamber openat the bottom. Air casks were used to keep the inmatesupplied with air. The modern diving-bell was used bySmeaton in 1788, and was made of cast iron. It sinksby its own weight. The pressure of the air inside issufficient to keep the water out. Air being easily com-pressed, it is always pumped in to keep the hollow iron bell full, and to supply the workmen. There areinventions now in use by which the diver carries a supplyof air with him on his back, and by turning a tap cansupply himself for a long time at a distance from theplace of descent, and thus is able to dispense with theair-tube from the boat at the surface. This appara
Size: 1448px × 1727px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
