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These observation balloons are operated from a large armored truck, to which they are fastened, and the truck runs along carrying the air-bag with it, attached with a long cable; it is handled just as a toy balloon would be carried by a boy, when the boy runs along, the balloon runs with him.
D -me, Pathfinder, if I think a man without a heart any better than a fish with a hole in his air-bag." "I don't know how that may be, Master Cap; but a man without a conscience is but a poor creatur', take my word for it, as any one will discover who has to do with a Mingo.
This had been already prepared; and only needed to be attached to the bottom of the air-bag. In the present case, the "bottom of the bag" is quite a figure of speech lucus a non lucendo.
Four or five of the animals were tied together and drawn over by a man seated across an air-bag. The weaker animals, such as the donkeys, had a bag half filled with air tied on their backs. The night of the 30th of June, the last of our journey, was one of the most wearisome: we travelled eleven hours.
In some of these, as in the Cod and Haddock, a red membrane, consisting of a great number of leaves or duplicatures, is found within the air-bag, which probably secretes this air from the blood of the animal. The air at the broad end of the egg is probably an organ serving the purpose of respiration to the young chick, some of whose vessels are spread upon it like a placenta, or permeate it.
His monoplane, as it lay on the surface of the water, would, he knew, prove a very difficult object to locate by any vessel searching for it; while it was so frail that it would not withstand for long the buffeting of the waves. He carried an air-bag fixed inside the fusilage, it is true; but, in spite of this precaution, Bleriot knew he ran a very grave peril of being drowned.
The necessity of the oxygenation of the blood in the fetus is farther illustrated by the analogy of the chick in the egg; which appears to have its blood oxygenated at the extremities of the vessels surrounding the yolk; which are spread on the air-bag at the broad end of the egg, and may absorb oxygene through that moist membrane from the air confined behind it; and which is shewn by experiments in the exhausted receiver to be changeable though the shell.
You have a quick invention, brother Caspar; can you think of anything I mean anything within our reach that would make the air-bag of a balloon?" "But could you make the balloon, if you had the stuff?" inquired Caspar, still in doubt whether any other than an experienced aeronaut could construct so wonderful a machine.
As it swims along, it is usually about the same weight as the water; but when it wants to dive, the fish squeezes its air-bag tightly together, which causes its body to become heavier than the water for air pressed closely together becomes heavy, and its own weight sinks it down.
The balloon "Santos-Dumont No. 4" was long and slim, and had an inner air-bag to compensate for the contraction of the hydrogen gas. This air-ship had one feature that was entirely new; the aeronaut had arranged for himself, not a secure basket to stand in, but a frail, unprotected bicycle seat attached to an ordinary bicycle frame. The cranks were connected with the starting-gear of the motor.
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