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Updated: June 8, 2025
Place some seeds on a sponge under an air-tight glass. Will they grow? What causes them to mould? Seeds will not germinate without free access of air. They must have free oxygen to breathe, as must every living thing. We know that an animal breathes in oxygen, that the oxygen unites with particles of carbon within the body and that the resulting carbonic acid gas is exhaled.
Cut off the top and solder on a ring of brass wire; make all the joints water-tight with solder, and give the tin a couple of coatings of paint inside and outside. Closing the Hot-air Chamber. When all the parts except the lamp chamber have been prepared, assemble them to make sure that everything is in order. The lower end of the hot-air chamber has then to be made air-tight.
And with a bow my guide noiselessly slipped out, softly closed the door behind him, and I was alone. I found myself in a comfortable low-ceiled room, warmed by an air-tight stove, and furnished with a cot-bed, half a dozen chairs, a large wooden spittoon filled with saw-dust, a looking-glass, and a table.
The fire-place was flanked by great branches of coral, and on the top of the air-tight stove there stood always in summer-time, when there was no fire, a superb nautilus shell, like a little pearl vessel. The corner what-not, too, had its shelves heaped with shells and coral and choice bits of rainbow lava from volcanic islands.
When his supply is low he swims to a submarine castle of silk, so air-tight that he can keep it filled with a large bubble of air, upon which he draws from time to time. And so we might go on enumerating almost endless uses for the web which is Nature's gift to these little waifs, who ages ago left the sea and have won a place for themselves in the sunshine among the butterflies and flowers.
In an air-tight enclosure, then, after a certain time, all the oxygen of the air will be replaced by the carbonic acid a gas fatal to life. There were two things to be done then first, to replace the absorbed oxygen; secondly, to destroy the expired carbonic acid; both easy enough to do, by means of chlorate of potassium and caustic potash.
The window sashes had to be made air-tight by wedges of wood or paper stuck into the frames; a bell in Dull Street rarely sounded after less than six pulls; there was scarcely a sitting-room but had a crack in its grimy ceiling, or a handle off its ill-hung door, or a strip of wall- paper peeling off its walls.
Our rooms at the Goldenes Kreuz had a wide balcony where our breakfasts were served, and commanded not only a view of the mountains and valleys, and a rushing stream, but afforded us our only meal where we could get plenty of air. Our first experience in the general dining-room was a revelation of many things. The room was air-tight.
She was staunch and beautiful a work of love, which means a work of honesty. Fore and aft were air-tight compartments. She had an oil tank, a water tank, engine housing, steering wheel, lockers. She was ready for the very engine I had ordered to be shipped to me at Bismarck. She was dry as a bone, and broad enough to make a snug bed for two.
"For you don't expect anything of black heathens," said she; "but there ain't any question in my mind about the accountability of folks livin' in a Christian country, where you can wear clothes and set up to an air-tight stove and be comfortable, to say nothin' of meetinghouses every mile or two, and Bible Societies and Young Men's and Young Women's Christian Associations, and the gospel free to all with the exception of pew rents and contribution boxes, and those omitted when it's necessary."
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