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B and B' are two series of regenerating chambers lined with refractory brick, and, besides, filled with refractory bricks piled up as shown in the figure. The partitions, C and C', are likewise of refractory brick, and are rendered as air-proof as possible.
These, with crackers, cheese, some cakes done up in air-proof packages, and tea constituted the supper that was finally placed before them. It really seemed to some of those hungry boys as though that was the finest feast they had ever sat down to. Of course that often came to their minds, because what they were just then eating tasted so very good.
For very long rows of trees the top cable needs to be supported by intermediate trestles besides the uprights at the ends. The gas and air-proof tent can be used for various other purposes besides those of killing pests on fruit trees.
All the lights were out, and in the darkness it might have been mistaken for a tubular boiler of a dumpy shape. It was built of aluminium steel, able to withstand the impact of a meteorite, and the interior was lined with caoutchouc, which is a non-conductor of heat, as well as air-proof. The foot or basement contained the driving mechanism, and a small cabin for Mr. Carmichael.
Can the shells of the Anthidia be air-proof, owing to some modification that escapes me? In any case, this impermeability cannot be attributed to the excremental mosaic, which the cocoons of the resin-working Anthidia do not possess, though endowed with an apex of the very best. Shall we find an answer to the question in the varnish with which the silken fabric is impregnated?
Into a small house, thoroughly air-proof, were brought bedclothes, clothing, and other articles which had been contaminated by yellow fever patients. Then for twenty days men who were nonimmune to the fever slept in this building, with no evil effects. This experiment was repeated several times.
But it was of no use to talk of paper: since there was not enough; and Karl had given over thinking of a balloon: because there was nothing within reach likely to serve for its construction. He knew that that great sphere would require to be air-proof.
The clothes were put up in air-proof tin uniform cases, small enough to be easily carried by a porter and secure enough to keep out the millions of ants that were expected to seek habitation in them. Most of our equipment, especially the food supplies, had been ordered by letter, and these we found to be practically ready.
"Mother seldom went, the hermetically sealed, air-proof architecture of the place not agreeing with her; so father, Eleanor, and I used to walk over, crossing the head of Washington Square, until, as we passed St. Mark's Church and reached the steps of the building, we often headed a procession as sedate and serious as if going to Sunday meeting, for there were fewer places to go in those days.
We were, although we did not know it, under an air-proof canopy, and were slowly but surely exhausting the life-giving oxygen around us, and replacing it by poisonous carbonic acid gas. Scientific men have since showed that a simple mathematical calculation might have told us exactly when the last atom of oxygen would have been consumed; but it is easy to be wise after the event.
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