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Half an hour later, the party, accoutred in their diving armour between which and their ordinary clothing they had interposed stout warm flannel overalls and armed with small ice-hatchets, mustered in the pilot- house; the ship was released from the ground, a vacuum created in her air-chambers, and upward she at once shot into the clear blue cloudless sky.
In order to do this weight had to be dropped, and Kurt was detailed with a dozen men to climb down among the wreckage of the deflated air-chambers and cut the stuff clear, portion by portion, as the airship sank.
Every one who had subscribed to the Gun Club was directly interested in the welfare of the travelers. At length the hauling-chains, the air-chambers, and the automatic grappling-irons were put on board. J. T. Maston, Engineer Murchison, and the delegates of the Gun Club, were already in their cabins.
Now, it is obvious that if you were to take a model of such a boat, turn it upside down on a table, and try to make it rest on its two rounded air-chambers, you would encounter as much difficulty as did the friends of Columbus when they sought to make an egg stand on its end. The boat would infallibly fall to one side or the other.
It is claimed that these air-chambers make it next to impossible to upset the canoe, and that even when filled with water it will support a heavy weight. Sponsons can also be purchased separately and can be adjusted to any sized canoe. For a novice the sponsons would seem a good thing, as they not only insure safety but, in doing away with the fear of an upset, make learning to paddle easier.
The illustration shows a simple furnace; but it would be an easy matter to improve upon this by providing iron air-tight doors lined with fireclay, for cleansing flues and air-chambers. The example given is only suited to heat a small public bath.
I once lost heavily in Marblehead Mammoth cabbage by having them buried on a hill-side with a gentle slope. In the course of the winter they fell over on their sides, which let down the soil from above, and, closing the air-chambers between them, brought the huge heads into a mass, and the result was, a large proportion of them rotted badly.
The second quality that of insubmergibility is due to air-chambers fixed round the sides of the boat, under the seats, and at the bow and stern. These air-cases are sufficiently buoyant to float the boat even if she were filled to overflowing with water and crowded to her utmost capacity with human beings.
In the body of the bird there are several large bags, like the lungs, called air-chambers; many of their bones are hollow, and others are pierced with long winding tubes called air-tubes. All these air-chambers and air-tubes are connected with the lungs so that air can pass into and out of them at each breath.
Now, the boat which I had been fortunate enough to find and which, by the way, seemed to be the only one that had not been carried down with the ship was Number 5, a craft thirty-two feet long by eight feet beam, carvel-built, double-ended, fitted with air-chambers fore and aft and along each side, with a keel six inches deep to enable her to work to windward under sail.
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