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Updated: May 7, 2025
Some gave a better light, but it was objected that they might consume more gas. The new burner was screwed down over this, making a gas-tight connection. "There," said he, "we have a gauge. The new burner will receive the same amount of gas that the old one consumed no more, no less but the current is slightly checked."
But he went up a ladder against a gale of ventilation a ladder that was encased in a kind of gas-tight fire escape and ran right athwart the great forward air-chamber to the little look-out gallery with a telephone, that gallery that bore the light pom-pom of German steel and its locker of shells.
Below the bag, which, as I have explained, was made up of a number of gas-tight compartments, hung from wire cables three cabins. The forward one was a sort of pilot-house, containing various instruments for navigating the ship of the air, observation rooms, gauges for calculating firing ranges, and the steering apparatus.
With the increase in depth of infected zones, through the increasingly lethal nature of the persistent compound, the tank will he compelled to rely on filtration methods of protection, instead of the use of compressed oxygen in a gas-tight compartment.
Over and above the stimulus which Count Zeppelin's great endeavour has given to the aeronautical world, two special triumphs are his. He has shown balloonists how to make a perfectly gas-tight material, and has raised powerful petroleum motors in a balloon with safety.
Proceeding to practical measures, Wise's first care was to procure some proper material of which to build an experimental balloon of sufficient size to lift and convey himself alone. For this he chose ordinary long-cloth, rendered gas-tight by coats of suitable varnish, the preparation of which became with him, as, indeed, it remains to this day, a problem of chief importance and difficulty.
The allimportant detail of varnish was supplied by a mixture of linseed oil and the active principle of ordinary driers, and this, laid on with a rubber, rendered the material gas-tight and quickly dry enough for use. Hundreds of hands, men and women, were employed at the two factories, at which some sixty balloons were produced before the end of the siege.
"The solution is obvious if we can't bring the generator to the air, we must bring the air to it." He began sketching rapidly on the pad before him, "We'll have all the power equipment in this room here in the back, and the control room up in front, here. The relays for controlling will be back here, so we can control electrically the operation of the power equipment from our warm, gas-tight room.
There's only one kind of unpowered, vertical rising thing I know of. Are you with me?" Rick finished his drink. "Balloon," he said crisply. "On the beam," Scotty approved. "The only thing that doesn't fit is the shape." Rick asked, "What's a balloon? It's just a gas-tight container. We're used to thinking of balloons as spheres, because it's the most efficient shape for internal pressure.
Sufficient to say that Tom's craft consisted first of a great semi-rigid bag, or envelope, made of specially prepared oiled silk and aluminum, to hold the gas, which was manufactured on board. There were a number of gas-tight compartments, so that if one, or even if a number of them burst, or were shot by an enemy, the craft would still remain afloat.
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