Diving bell

“ The diving bell has this advantage over the dress, that several men can work in company; on the other hand, should an accident happen, more lives are involved. Some years ago the chain of a diving bell in use at a pier in Dover, England, got fouled in some way and its occupants found themselves in a most alarming predicament. However, a diver named William Wharlow, donning his suit, descended, crowbar in hand, and after several hours of hard work, succeeded in freeing the chain, when the diving bell was hauled up in safety. ”

“ Down and down they went, the pressure on the diving bell becoming each second more powerful.
At such a depth no human being could have lived without something to protect him from a weight which was ever ready to crush anything from the outside world.
At last the diving bell rested on the bottom of the ocean, and Amos Fearless sent up the signal to stop lowering. ”

“ A diving bell is shaped like its name. A common glass tumbler thrust down into a pail of water, with the open side down, will show exactly the principle on which a diving bell works. It illustrates the fact that two things cannot occupy the same place at the same time. ”

“ I am not sure but the diving bell is getting somewhat out of use now. People have found out another way of groping along on the bottom of rivers and seas. They do it frequently, I believe, by means of a kind of armor made of India rubber. But so far as my book is concerned, it is of no consequence whether the diving bell is out of use or not. ”

“ If a diving bell be sunk to a depth of, say, 33 ft., the air inside it will be compressed to about half its original volume, and the bell itself will be about half filled with water. But if a supply of air be maintained at a pressure equal to the depth of water at which the bell is submerged, not only will the water be kept down to the cutting edge, but the bell will be ventilated and it will be possible for its occupants to work for hours at a stretch. ”

“ Diving bells have been used very effectively. A diving bell is a contrivance for the purpose of enabling persons to descend, and to remain, below the surface of water for a length of time, to perform various operations, such as examining the foundations of bridges, blasting rocks, recovering treasure from sunken vessels, etc. ”

“ I think the air here, inside and out, must weigh heavily; it lies on one's lungs like a sponge. I once went down in a diving-bell when I was a boy; I have the sensation in this country of being always down in a diving-bell. ”

“ The diving-bell is a sort of huge inverted cup, let down into the water by its own weight, opening downward, so that the man in the bell faces the water directly with nothing between himself and it. Death by drowning is always within arm's length, yet he remains safe. ”

“ Modern diving-bells are usually rectangular in shape, and have a trunk or tube on top reaching to the surface of the water, and fitted with an air-lock to enable men to go into or out of the bell without moving it from the bottom ”

“ The diving-bell in which I descended was a cast-iron vessel about six feet long by four feet and a half wide, and five feet eight inches high. In the top of the bell there were twelve circular apertures, each about six inches in diameter, filled by thick plate-glass fixed by water-tight cement. Exactly in the centre there were a number of small holes through which the air was continually pumped in from above.
At the ends of the bell are two seats, placed at such a height, that the top of the head is but a few inches below the top of the bell; these will conveniently hold two persons each. ”

“ Every schoolboy is taught the principle of the diving bell, which can be illustrated by the use of a tumbler or glass. If a tumbler is turned upside down and forced into water, the water will not rise to fill the tumbler, owing to the fact that the air, being the lighter, will remain in the tumbler and the water will simply rise, compressing the air to the same pressure per square inch as the pressure surrounding it. ”

“ It is all like the wonders of the Arabian Nights made tangible or like a strange spectacular dream. If one were in a great diving-bell at the bottom of the veritable ocean he could hardly feel more detached from the ordinary aerial world of fact. ”

“ It afforded room enough for two men to work, and was supplied with air by a force pump worked from a boat at the surface.
Though the diving bell has been largely superseded by the modern diving apparatus, it is still used on certain classes of work the magnitude of which justifies the expense entailed, for it is not only a question of the cost of the bell, but of the powerful steam-driven crane which is needed to lower and raise it, and also of the gantry on which the crane travels. Sometimes a barge or other vessel is used for working the bell. ”

“ The diving-bell was so styled owing to the first machines being made in the shape of a gigantic bell. An inverted wine-glass, thrust mouth downwards into water, will not fill with water, owing to the air which it contains keeping the water out. It will partially fill, however, because air is compressible, and the deeper down it is thrust the more will the air be compressed. ”

“ A constant flow of fresh air is kept up, and all excess of air escapes from the lower part of the bell, the pressure of the air being kept slightly above that of the water outside. The diving-bell has long been found highly useful for carrying on work under water, a steam-crane being usually employed for the movements required. ”

“ You note that small man, with the sharp face--the one sipping a glass, to the right of the table? That is Mr. Boskirk, inventor of the 'Submarine Summer House,' a species of diving bell, which is to be owned and managed by a Joint-Stock Company. I have promised to take a few shares in the concern."
"Excuse the digression, madam," said Overtop, "but ought not these two gentlemen to change places in life? Is not the heavy one peculiarly adapted to the diving bell, and the light one to the balloon?"
Mrs. Slapman smiled, and looked faintly surprised, as if the remark were unworthy of her guest. ”

“ Regular divers could never make it. They would be crushed to death by the mere pressure of the water."
"I have thought the matter over, Dave, and I think it will be best for both you and your father to go down only a half-mile the first day. Then, if that is successful, you can go a little deeper each day, until the bottom is reached. And you will have to use the diving bell at all times."
"I know that. And if we leave the diving bell at all it will have to be in those new steel-ribbed diving suits we had made in Washington especially for this trip," concluded the young diver. ”

“ My instincts, as well as what I have noticed, tell me that a diver must be in the best of health, must be rather thin, have excellent eyesight, sound lungs, steady nerves, and a strong heart. The work is not easy. I wonder if work that pays well is often easy? I do not believe it is.
There used to be a strange machine in use called the "diving-bell." A great cast-iron cage, shaped something like a bell, let down by ropes, and so heavy that its own weight would sink it. Divers could sit inside, and fresh air was supplied by a force-pump. ”

“ Having completed one section, the bell was moved along to another. The concrete blocks were then lowered and placed in position by helmet divers. The bell divers, clad in thick woollen suits and watertight thigh boots, worked in shifts of about three hours each, and were paid at the rate of from 1s. to 15d. per hour.
The cost of an ordinary diving bell, including air compressor, telephonic apparatus and electric light, is from £600 to £1500, according to size. ”

“ Yes, they could do that, but usually they scatter it so far, and the ocean currents so cover it with sand, that it is impossible ever to get it again. I admit that if a wreck is blown apart a man in a diving bell can perhaps get a small part of it. But the limitations of a diving bell are so well recognized that several inventors have tried adjusting movable arms to the bell, to be operated by the man inside. ”

“ The air contained within these vessels prevents them from being filled with water on submersion, so that the diver may descend in them and breathe freely for a long time, provided he can be furnished with a new supply of fresh air when the contained air becomes vitiated by respiration. The diving-bell is usually made of cast iron, and weighted, and has several strong convex lenses set in the sides or roof, to admit light to the persons inside. ”

“ All nature is alive, and seems to be gathering all her entomological hosts to eat you up, as you are standing, out of your coat, waistcoat, and breeches. Such are the tropics. All this reconciles us to our dews, fogs, vapours, and drizzle; to our apothecaries rushing about with gargles and tinctures; to our old British constitutional coughs, sore throats, and swelled faces."
INVENTION OF THE DIVING-BELL. In the United States of America, generally, and to some extent in England, the invention of the diving-bell has been attributed to Sir William Phipps ”

“ The sight of the gulls thus engaged apparently reminds the ducks of their negligence in this respect, and paddling full speed ahead, they are soon busy diving in the shallower water of the reef. The longtails push their way right up to the base of the tower, round which they are seen circling, plucking at the green vegetation adhering to the stonework, and cackling loudly as they breathe for a few seconds on the surface, all unconscious of our presence on the balcony above them. ”

“ A transmitter of a special watertight pattern is placed between the front glass and one of the side glasses, and a contact piece, which, when the diver presses his chin against it, rings a bell at the surface, is fitted immediately below the front glass. A buzzer is sometimes fixed in the helmet to call the diver’s attention when the attendant wishes to speak, but as a rule the voice is transmitted so loudly that this device is unnecessary. ”

“ We now come to another mode of diving, in which the bell is practically superseded by the flexible tube, which allows to the diver far more range than can be obtained by the bell. In this case the diver wears a peculiar dress, the chief part of which is a helmet so constructed that air can be introduced to it from above the surface of the water, and, after respiration, can escape by means of a valve.
Air is pumped into the tube by assistants above water, and, as the tube is long and elastic, the diver can move about with considerable freedom. ”

“ For those who are in want of a headache, and do not mind paying a shilling for the accommodation, this is such an opportunity as does not often occur. We have different tastes: so, after having sufficiently admired the unfortunate diver, who, enveloped in waterproof, and with his head mysteriously encased in a huge tin pot, seems to spend the greater part of his life in groping for halfpence at the bottom of a pond, we leave the diving bell to make its daily journey, and push on past wax flowers and portions of the Blondin rope, and Dr. ”

“ Taking wing on the slightest provocation, they wheel aimlessly round the Rock, and instead of their usual steady persistence in diving for a living, they seem quite discontented with their lot, and plainly making up their minds to desert us for the summer. Advances by the males are as yet met with scornful rebuffs by their less showy plumaged partners, but soon a mutual understanding will be arrived at, and before the month closes they will have gone house-hunting, eiders possibly to the Isle of May, while the long-tails, being migratory, seek their homes in the frozen North. ”

“ The ballast, which at once gives the necessary sinking weight to the bell and maintains its equilibrium, consisted of slabs of cast iron bolted to the walls of the bell, inside. Each bell was fitted with loud-sounding telephonic apparatus, by means of which the occupants could communicate either with the men attending the crane or the men looking after the air compressors at the surface. Electric lamps, supplied with current by a dynamo in the compressor room, gave the necessary light inside the bell. ”

“ It can readily be imagined that, owing to its unwieldy character, the employment of the air-lock bell is resorted to only in those cases where the nature of the sea bed necessitates its remaining on a given spot for some considerable time, as for instance in the excavation of hard rock to a given depth. ”

“ Right well does it merit our confidence. After a century’s buffetings with the elements, not a single sign of weakening in the never ceasing conflict is evident. Surely a creditable testimony to the honesty of the labour employed in its erection.
That herring are occasionally in our vicinity is evidenced by the industrious diving of the gannets, accompanied by large flocks of gulls and terns, and also by the presence of whales snorting and puffing close to the Rock. At low water the reef is covered with gulls and terns resting from their labours of the tide. ”

“ At present a flock of thirteen is to be seen diving in the deep water surrounding the reef. Scorning the crustaceans, molluscs, and other ground game of the eiders and longtails, these birds subsist entirely upon fish, in pursuit of which they are extremely dexterous. The long sharp-pointed bill is excellently adapted for securing their prey, the extremity of the upper mandible curving over the lower in a sharp hook, the efficiency of which I once saw forcibly demonstrated. ”