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Updated: May 3, 2025
The object of making bread, that is of mixing water with the flour and subsequently exposing the dough to intense heat, is to expand and rupture the cells of the grain so as to expose the greatest possible surface to the action of the digestive fluids; this is accomplished in several ways; by the formation of air cells through the medium of acetous fermentation, as in yeast bread; by the mechanical introduction of carbonic acid gas, as in ærated bread; by the mixture with the flour of a gas-generating compound, which needs only the contact of moisture to put it in active operation; and by the beating into the dough of atmospheric air.
There were many other pieces of apparatus aboard, some not completely installed, the uses of which I shall mention from time to time, as the story progresses. The gas-generating machine was of importance, for there would be a leakage and shrinking of the vapor from the big bag, and some means must be provided for replenishing it.
Ekholm, calculating that the leakage of gas amounted to nearly 1 per cent. per day, became distrustful of the capability of such a vessel to cope with such a voyage as had been aimed at. The party had now no choice but to return home with their balloon, leaving, however, the shed and gas-generating apparatus for another occasion.
The young inventor alone seemed to keep his nerve. Coolly and calmly he stood at his post of duty, shifting the wing planes from moment to moment, managing the elevation rudder, and, at the same time, keeping his eye on the registering dial of the gas-generating machine. "It's all right," said Tom, more easily than he felt. "We are going up slowly.
Below the big gas bag was the ship proper, a light but strong and rigid framework about which were built enclosed cabins. These cabins, or compartments, housed the driving machinery, the gas-generating plant, living, sleeping and dining quarters, and a pilot-house, whence the ship could be controlled. But this was not all.
He increased the speed of the motor so that the propellers would aid in taking the ship higher up, while the gas-generating machine was set in operation to pour the lifting vapor into the big bag.
They were not quite yet, but at last the power of machinery had prevailed over that of the elements. Through the pelting rain, and amid the glare of the lightning, and the thunder of heaven's artillery, the airship forced her way, up and up and up. Setting the motor controller to give the maximum power until he released it, Tom hastened to the gas-generating apparatus.
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