"To let the air, which the diver breathes from his lungs, into the water," Mr. Lacelle replied. "This machine in the case," pointing to a high black-walnut case, "is a three-cylinder air-pump; two men in the vessel, or on the shore, keep the pumps constantly in motion by means of the crank attached to the wheel."
"Why do they have more than one pump?" Eric inquired.
"One pump," answered Mr. Lacelle, "would not supply enough air; it would work like a water-pump, sending down the air by jerks, and the receiver would be exhausted between the supplies of air. Two pumps would send down the air puff-puff, like the pumps of a steam engine; but three pumps, constantly in motion, send down, through the hose, a steady and continuous stream of air, enabling the diver to breathe freely and fully."
"And can you go down into any depth of water?" Eric asked, with intense interest.
"Not lower than one hundred feet, usually, the pressure of the water is so great. I have been down one hundred and fifty-six feet below the surface; but that was something very remarkable."
"And did you never have any hair-breadth escapes, or thrilling adventures?" inquired Eric.
"No," answered the diver, with a slight laugh and shrug of the shoulders, "I never did, and never knew any one who did, although I have read of many such incidents, altogether too marvellous for belief. You see," he continued, "we know that the least carelessness would probably cost us our lives, and we are minutely accurate about all our equipments. And," lowering his voice and speaking reverentially, "I always commit myself to the guidance and tender care of the good Shepherd.
"'They that go down to the sea in ships, that do business in great waters,
"'These see the works of the Lord, and his wonders in the deep.
"'They cry unto the Lord in their trouble, and he bringeth them out of their distress.'"
Eric listened, and his respect and esteem for the diver grew tenfold more.
"It is a strange business. The danger fascinates some, but the peril is never lost sight of. I put on the helmet, for the first time, more than ten years ago; and yet I never resume it without a feeling that it may be the last time I shall ever go down. Of course one has more confidence after a while; but there is something in being shut up in an armor weighed down with a hundred pounds, and knowing that a little leak in your life-pipe is your death, that no diver can get rid of. And I do not know that I should care to banish the feeling, for the sight of the clear blue sky, the genial sun, and the face of a fellow-man after long hours among the fishes, makes you feel like one who has suddenly been drawn away from the grasp of death."