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He wanted to know exactly how he stood to these new things. He tried to compose himself to wait until someone came to him. Presently he became restless and eager for information, for distraction, for fresh sensations. He went back to the apparatus in the other room, and had soon puzzled out the method of replacing the cylinders by others.
If you have ever peered through one of those pasteboard cylinders dear to childhood, you will catch a tithe of my early sensations. All that I had read of the canvases was mere colourless phrase-making.
Rings of wire pass around the roll at regular intervals and hold the longitudinal wires in place. For batonné paper, there are thick longitudinal wires at intervals and between them either smaller wires or gauze, as the paper is to be laid batonné or wove batonné. After passing the dandy roll the paper goes over a number of rollers covered with felt and cylinders heated by steam, until it is dry.
These rolls are composed of metal cylinders, alternating with rolls made of solidified paper or cotton, turned exactly true, the top and bottom rolls being of metal and heavier than the others; a stack of supercalenders is necessarily composed of an odd number of rolls, as seven, nine, or eleven.
"It doesn't matter if it is," the scientist answered. "I can make more cylinders, but I don't want that secret of the gas to become known. Your bullet served a good turn, Andy, for it let the compressed vapor out just in time." "Then we may consider the experiment a success," said Mark, as Washington went to where the cylinder had fallen, to detach it from the weight and bring both to the shed.
To what he was fleeing he could scarcely have told, since the telegraph would send its word throughout the desert-land, and overhaul him finally. A sickening apprehension assailed him, however, within the minute. One of his cylinders was missing. His trained ear caught at the change of the "tune," and he felt his speed decreasing.
But fortunately there was no need to use weapons then, for Sanborn's idea was overruled, and from the position in which the air-ship hovered she could not spy the aeroplane. "No; come on, let's get back," urged Malvoise; "there is something wrong with one of the cylinders and I want to fix it before we tackle the job of taking off the treasure."
The gas is stored in cylinders under a pressure varying from six to ten or more atmospheres; in other words from about 80 to 140 or more pounds per square inch. Special military wagons have been designed for the transport of these cylinders, and they are attached to the balloon train. The balloon itself is light, and made of such materials as to reduce the weight thereof to the minimum.
Green's requirements was that the cylinders should be made of cast-steel, and that they should come from a British foundry. The company that took the work in hand, the Aster Company, had confidence in the inventor's ideas. It is said that they had to waste 250 castings before six perfect cylinders were produced. It is estimated that the first Green engine cost L6000.
Among the tremendous crises of each day none was more dramatic than starting the engine. It was slow on cold mornings; there was the long, anxious whirr of the starter; and sometimes he had to drip ether into the cocks of the cylinders, which was so very interesting that at lunch he would chronicle it drop by drop, and orally calculate how much each drop had cost him.
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